Update: Added folder structure for usecase diagram

on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>

.changeset/beige-peas-shave.md

@@ -0,0 +1,5 @@
+---
+'@mermaid-js/mermaid-zenuml': patch
+---
+
+Fixed a critical bug that the ZenUML diagram is not rendered.

.changeset/large-mirrors-cheer.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Update casing of ID in requirement diagram

.changeset/lemon-masks-unite.md

@@ -0,0 +1,5 @@
+---
+'mermaid': minor
+---
+
+feat: Added support for per link curve styling in flowchart diagram using edge ids

.changeset/light-flowers-judge.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Make flowchart elk detector regex match less greedy

.changeset/lovely-queens-own.md

@@ -0,0 +1,8 @@
+---
+'mermaid': patch
+---
+
+fix(block): overflowing blocks no longer affect later lines
+
+This may change the layout of block diagrams that have overflowing lines
+(i.e. block diagrams that use up more columns that the `columns` specifier).

.changeset/ninety-roses-turn.md

@@ -0,0 +1,7 @@
+---
+'mermaid': patch
+---
+
+fix: log warning for blocks exceeding column width
+
+This update adds a validation check that logs a warning message when a block's width exceeds the defined column layout.

.changeset/rare-women-fly.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Add escaped class literal name on namespace

.changeset/silver-eyes-build.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+chore: migrate to class-based ArchitectureDB implementation

.changeset/smart-humans-cover.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Update flowchart direction TD's behavior to be the same as TB

.changeset/vast-buses-see.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+chore: Update packet diagram to use new class-based database structure

.cspell/code-terms.txt

@@ -143,6 +143,7 @@ typeof
 typestr
 unshift
 urlsafe
+usecase
 verifymethod
 VERIFYMTHD
 WARN_DOCSDIR_DOESNT_MATCH

.github/workflows/e2e-timings.yml

@@ -58,7 +58,7 @@ jobs:
           echo "EOF" >> $GITHUB_OUTPUT
 
       - name: Commit and create pull request
-        uses: peter-evans/create-pull-request@889dce9eaba7900ce30494f5e1ac7220b27e5c81
+        uses: peter-evans/create-pull-request@07cbaebb4bfc9c5d7db426ea5a5f585df29dd0a0
         with:
           add-paths: |
             cypress/timings.json

CHANGELOG.md

@@ -0,0 +1 @@
+./packages/mermaid/CHANGELOG.md

cypress/integration/rendering/block.spec.js

@@ -384,4 +384,17 @@ describe('Block diagram', () => {
       {}
     );
   });
+
+  it('BL30: block should overflow if too wide for columns', () => {
+    imgSnapshotTest(
+      `block-beta
+  columns 2
+  fit:2
+  overflow:3
+  short:1
+  also_overflow:2
+`,
+      {}
+    );
+  });
 });

cypress/integration/rendering/classDiagram.spec.js

@@ -495,4 +495,34 @@ describe('Class diagram', () => {
       cy.get('a').should('have.attr', 'target', '_blank').should('have.attr', 'rel', 'noopener');
     });
   });
+
+  describe('Include char sequence "graph" in text (#6795)', () => {
+    it('has a label with char sequence "graph"', () => {
+      imgSnapshotTest(
+        `
+        classDiagram
+          class Person {
+            +String name
+            -Int id
+            #double age
+            +Text demographicProfile
+          }
+        `,
+        { flowchart: { defaultRenderer: 'elk' } }
+      );
+    });
+  });
+
+  it('should handle backticks for namespace and class names', () => {
+    imgSnapshotTest(
+      `
+      classDiagram
+          namespace \`A::B\` {
+              class \`IPC::Sender\`
+          }
+          RenderProcessHost --|> \`IPC::Sender\`
+      `,
+      {}
+    );
+  });
 });

cypress/integration/rendering/erDiagram.spec.js

@@ -354,4 +354,19 @@ ORDER ||--|{ LINE-ITEM : contains
       { logLevel: 1 }
     );
   });
+
+  describe('Include char sequence "graph" in text (#6795)', () => {
+    it('has a label with char sequence "graph"', () => {
+      imgSnapshotTest(
+        `
+        erDiagram
+          p[Photograph] {
+            varchar(12) jobId
+            date dateCreated
+          }
+        `,
+        { flowchart: { defaultRenderer: 'elk' } }
+      );
+    });
+  });
 });

cypress/integration/rendering/flowchart-v2.spec.js

@@ -1113,4 +1113,24 @@ end
       );
     });
   });
+
+  it('6617: Per Link Curve Styling using edge Ids', () => {
+    imgSnapshotTest(
+      `flowchart TD
+      A e1@-->B e5@--> E
+      E e7@--> D
+      B e3@-->D
+      A e2@-->C e4@-->D
+      C e6@--> F
+      F e8@--> D
+      e1@{ curve: natural }
+      e2@{ curve: stepAfter }
+      e3@{ curve: monotoneY }
+      e4@{ curve: bumpY }
+      e5@{ curve: linear }
+      e6@{ curve: catmullRom }
+      e7@{ curve: cardinal }
+      `
+    );
+  });
 });

cypress/integration/rendering/mindmap.spec.ts

@@ -246,5 +246,22 @@ Word!\`]
       );
     });
   });
+  describe('Include char sequence "graph" in text (#6795)', () => {
+    it('has a label with char sequence "graph"', () => {
+      imgSnapshotTest(
+        `
+        mindmap
+          root
+            Photograph
+              Waterfall
+              Landscape
+            Geography
+              Mountains
+              Rocks
+        `,
+        { flowchart: { defaultRenderer: 'elk' } }
+      );
+    });
+  });
   /* The end */
 });

docs/config/setup/mermaid/interfaces/ParseOptions.md

@@ -10,7 +10,7 @@
 
 # Interface: ParseOptions
 
-Defined in: [packages/mermaid/src/types.ts:59](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L59)
+Defined in: [packages/mermaid/src/types.ts:72](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L72)
 
 ## Properties
 
@@ -18,7 +18,7 @@ Defined in: [packages/mermaid/src/types.ts:59](https://github.com/mermaid-js/mer
 
 > `optional` **suppressErrors**: `boolean`
 
-Defined in: [packages/mermaid/src/types.ts:64](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L64)
+Defined in: [packages/mermaid/src/types.ts:77](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L77)
 
 If `true`, parse will return `false` instead of throwing error when the diagram is invalid.
 The `parseError` function will not be called.

docs/config/setup/mermaid/interfaces/ParseResult.md

@@ -10,7 +10,7 @@
 
 # Interface: ParseResult
 
-Defined in: [packages/mermaid/src/types.ts:67](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L67)
+Defined in: [packages/mermaid/src/types.ts:80](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L80)
 
 ## Properties
 
@@ -18,7 +18,7 @@ Defined in: [packages/mermaid/src/types.ts:67](https://github.com/mermaid-js/mer
 
 > **config**: [`MermaidConfig`](MermaidConfig.md)
 
-Defined in: [packages/mermaid/src/types.ts:75](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L75)
+Defined in: [packages/mermaid/src/types.ts:88](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L88)
 
 The config passed as YAML frontmatter or directives
 
@@ -28,6 +28,6 @@ The config passed as YAML frontmatter or directives
 
 > **diagramType**: `string`
 
-Defined in: [packages/mermaid/src/types.ts:71](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L71)
+Defined in: [packages/mermaid/src/types.ts:84](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L84)
 
 The diagram type, e.g. 'flowchart', 'sequence', etc.

docs/config/setup/mermaid/interfaces/RenderResult.md

@@ -10,7 +10,7 @@
 
 # Interface: RenderResult
 
-Defined in: [packages/mermaid/src/types.ts:85](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L85)
+Defined in: [packages/mermaid/src/types.ts:98](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L98)
 
 ## Properties
 
@@ -18,7 +18,7 @@ Defined in: [packages/mermaid/src/types.ts:85](https://github.com/mermaid-js/mer
 
 > `optional` **bindFunctions**: (`element`) => `void`
 
-Defined in: [packages/mermaid/src/types.ts:103](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L103)
+Defined in: [packages/mermaid/src/types.ts:116](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L116)
 
 Bind function to be called after the svg has been inserted into the DOM.
 This is necessary for adding event listeners to the elements in the svg.
@@ -45,7 +45,7 @@ bindFunctions?.(div); // To call bindFunctions only if it's present.
 
 > **diagramType**: `string`
 
-Defined in: [packages/mermaid/src/types.ts:93](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L93)
+Defined in: [packages/mermaid/src/types.ts:106](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L106)
 
 The diagram type, e.g. 'flowchart', 'sequence', etc.
 
@@ -55,6 +55,6 @@ The diagram type, e.g. 'flowchart', 'sequence', etc.
 
 > **svg**: `string`
 
-Defined in: [packages/mermaid/src/types.ts:89](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L89)
+Defined in: [packages/mermaid/src/types.ts:102](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/types.ts#L102)
 
 The svg code for the rendered graph.

docs/diagrams/flowchart-code-flow.mmd

@@ -0,0 +1,189 @@
+---
+references:
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDiagram.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDb.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDetector.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDetector-v2.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowRenderer-v3-unified.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/styles.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/types.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowChartShapes.js"
+  - "File: /packages/mermaid/src/diagrams/flowchart/parser/flowParser.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/elk/detector.ts"
+generationTime: 2025-07-23T10:31:53.266Z
+---
+flowchart TD
+    %% Entry Points and Detection
+    Input["User Input Text"] --> Detection{Detection Phase}
+    
+    Detection --> flowDetector["flowDetector.ts<br/>detector(txt, config)"]
+    Detection --> flowDetectorV2["flowDetector-v2.ts<br/>detector(txt, config)"]
+    Detection --> elkDetector["elk/detector.ts<br/>detector(txt, config)"]
+    
+    flowDetector --> |"Checks /^\s*graph/"| DetectLegacy{Legacy Flowchart?}
+    flowDetectorV2 --> |"Checks /^\s*flowchart/"| DetectNew{New Flowchart?}
+    elkDetector --> |"Checks /^\s*flowchart-elk/"| DetectElk{ELK Layout?}
+    
+    DetectLegacy --> |Yes| LoadDiagram
+    DetectNew --> |Yes| LoadDiagram
+    DetectElk --> |Yes| LoadDiagram
+    
+    %% Loading Phase
+    LoadDiagram["loader() function"] --> flowDiagram["flowDiagram.ts<br/>diagram object"]
+    
+    flowDiagram --> DiagramStructure{Diagram Components}
+    DiagramStructure --> Parser["parser: flowParser"]
+    DiagramStructure --> Database["db: new FlowDB()"]
+    DiagramStructure --> Renderer["renderer: flowRenderer-v3-unified"]
+    DiagramStructure --> Styles["styles: flowStyles"]
+    DiagramStructure --> Init["init: (cnf: MermaidConfig)"]
+    
+    %% Parser Phase
+    Parser --> flowParser["parser/flowParser.ts<br/>newParser.parse(src)"]
+    flowParser --> |"Preprocesses src"| RemoveWhitespace["Remove trailing whitespace<br/>src.replace(/}\s*\n/g, '}\n')"]
+    RemoveWhitespace --> flowJison["parser/flow.jison<br/>flowJisonParser.parse(newSrc)"]
+    
+    flowJison --> ParseGraph["Parse Graph Structure"]
+    ParseGraph --> ParseVertices["Parse Vertices"]
+    ParseGraph --> ParseEdges["Parse Edges"]
+    ParseGraph --> ParseSubgraphs["Parse Subgraphs"]
+    ParseGraph --> ParseClasses["Parse Classes"]
+    ParseGraph --> ParseStyles["Parse Styles"]
+    
+    %% Database Phase - FlowDB Class
+    Database --> FlowDBClass["flowDb.ts<br/>FlowDB class"]
+    
+    FlowDBClass --> DBInit["constructor()<br/>- Initialize counters<br/>- Bind methods<br/>- Setup toolTips<br/>- Call clear()"]
+    
+    DBInit --> DBMethods{FlowDB Methods}
+    
+    DBMethods --> addVertex["addVertex(id, textObj, type, style,<br/>classes, dir, props, metadata)"]
+    DBMethods --> addLink["addLink(_start[], _end[], linkData)"]
+    DBMethods --> addSingleLink["addSingleLink(_start, _end, type, id)"]
+    DBMethods --> setDirection["setDirection(dir)"]
+    DBMethods --> addSubGraph["addSubGraph(nodes[], id, title)"]
+    DBMethods --> addClass["addClass(id, style)"]
+    DBMethods --> setClass["setClass(ids, className)"]
+    DBMethods --> setTooltip["setTooltip(ids, tooltip)"]
+    DBMethods --> setClickEvent["setClickEvent(id, functionName, args)"]
+    DBMethods --> setClickFun["setClickFun(id, functionName, args)"]
+    
+    %% Vertex Processing
+    addVertex --> VertexProcess{Vertex Processing}
+    VertexProcess --> CreateVertex["Create FlowVertex object<br/>- id, labelType, domId<br/>- styles[], classes[]"]
+    VertexProcess --> SanitizeText["sanitizeText(textObj.text)"]
+    VertexProcess --> ParseMetadata["Parse YAML metadata<br/>yaml.load(yamlData)"]
+    VertexProcess --> SetVertexProps["Set vertex properties<br/>- shape, label, icon, form<br/>- pos, img, constraint, w, h"]
+    
+    %% Edge Processing  
+    addSingleLink --> EdgeProcess{Edge Processing}
+    EdgeProcess --> CreateEdge["Create FlowEdge object<br/>- start, end, type, text<br/>- labelType, classes[]"]
+    EdgeProcess --> ProcessLinkText["Process link text<br/>- sanitizeText()<br/>- strip quotes"]
+    EdgeProcess --> SetEdgeProps["Set edge properties<br/>- type, stroke, length"]
+    EdgeProcess --> GenerateEdgeId["Generate edge ID<br/>getEdgeId(start, end, counter)"]
+    EdgeProcess --> ValidateEdgeLimit["Validate edge limit<br/>maxEdges check"]
+    
+    %% Data Collection
+    DBMethods --> GetData["getData()"]
+    GetData --> CollectNodes["Collect nodes[] from vertices"]
+    GetData --> CollectEdges["Collect edges[] from edges"]
+    GetData --> ProcessSubGraphs["Process subgraphs<br/>- parentDB Map<br/>- subGraphDB Map"]
+    GetData --> AddNodeFromVertex["addNodeFromVertex()<br/>for each vertex"]
+    GetData --> ProcessEdgeTypes["destructEdgeType()<br/>arrowTypeStart, arrowTypeEnd"]
+    
+    %% Node Creation
+    AddNodeFromVertex --> NodeCreation{Node Creation}
+    NodeCreation --> FindExistingNode["findNode(nodes, vertex.id)"]
+    NodeCreation --> CreateBaseNode["Create base node<br/>- id, label, parentId<br/>- cssStyles, cssClasses<br/>- shape, domId, tooltip"]
+    NodeCreation --> GetCompiledStyles["getCompiledStyles(classDefs)"]
+    NodeCreation --> GetTypeFromVertex["getTypeFromVertex(vertex)"]
+    
+    %% Rendering Phase
+    Renderer --> flowRendererV3["flowRenderer-v3-unified.ts<br/>draw(text, id, version, diag)"]
+    
+    flowRendererV3 --> RenderInit["Initialize rendering<br/>- getConfig()<br/>- handle securityLevel<br/>- getDiagramElement()"]
+    
+    RenderInit --> GetLayoutData["diag.db.getData()<br/>as LayoutData"]
+    GetLayoutData --> SetupLayoutData["Setup layout data<br/>- type, layoutAlgorithm<br/>- direction, spacing<br/>- markers, diagramId"]
+    
+    SetupLayoutData --> CallRender["render(data4Layout, svg)"]
+    CallRender --> SetupViewPort["setupViewPortForSVG(svg, padding)"]
+    SetupViewPort --> ProcessLinks["Process vertex links<br/>- create anchor elements<br/>- handle click events"]
+    
+    %% Shape Rendering
+    CallRender --> ShapeSystem["flowChartShapes.js<br/>Shape Functions"]
+    
+    ShapeSystem --> ShapeFunctions{Shape Functions}
+    ShapeFunctions --> question["question(parent, bbox, node)"]
+    ShapeFunctions --> hexagon["hexagon(parent, bbox, node)"]
+    ShapeFunctions --> rect_left_inv_arrow["rect_left_inv_arrow(parent, bbox, node)"]
+    ShapeFunctions --> lean_right["lean_right(parent, bbox, node)"]
+    ShapeFunctions --> lean_left["lean_left(parent, bbox, node)"]
+    
+    ShapeFunctions --> insertPolygonShape["insertPolygonShape(parent, w, h, points)"]
+    ShapeFunctions --> intersectPolygon["intersectPolygon(node, points, point)"]
+    ShapeFunctions --> intersectRect["intersectRect(node, point)"]
+    
+    %% Styling System
+    Styles --> stylesTS["styles.ts<br/>getStyles(options)"]
+    stylesTS --> StyleOptions["FlowChartStyleOptions<br/>- arrowheadColor, border2<br/>- clusterBkg, mainBkg<br/>- fontFamily, textColor"]
+    
+    StyleOptions --> GenerateCSS["Generate CSS styles<br/>- .label, .cluster-label<br/>- .node, .edgePath<br/>- .flowchart-link, .edgeLabel"]
+    GenerateCSS --> GetIconStyles["getIconStyles()"]
+    
+    %% Type System
+    Parser --> TypeSystem["types.ts<br/>Type Definitions"]
+    TypeSystem --> FlowVertex["FlowVertex interface"]
+    TypeSystem --> FlowEdge["FlowEdge interface"]
+    TypeSystem --> FlowClass["FlowClass interface"]
+    TypeSystem --> FlowSubGraph["FlowSubGraph interface"]
+    TypeSystem --> FlowVertexTypeParam["FlowVertexTypeParam<br/>Shape types"]
+    
+    %% Utility Functions
+    DBMethods --> UtilityFunctions{Utility Functions}
+    UtilityFunctions --> lookUpDomId["lookUpDomId(id)"]
+    UtilityFunctions --> getClasses["getClasses()"]
+    UtilityFunctions --> getDirection["getDirection()"]
+    UtilityFunctions --> getVertices["getVertices()"]
+    UtilityFunctions --> getEdges["getEdges()"]
+    UtilityFunctions --> getSubGraphs["getSubGraphs()"]
+    UtilityFunctions --> clear["clear()"]
+    UtilityFunctions --> defaultConfig["defaultConfig()"]
+    
+    %% Event Handling
+    ProcessLinks --> EventHandling{Event Handling}
+    EventHandling --> setupToolTips["setupToolTips(element)"]
+    EventHandling --> bindFunctions["bindFunctions(element)"]
+    EventHandling --> runFunc["utils.runFunc(functionName, args)"]
+    
+    %% Common Database Functions
+    DBMethods --> CommonDB["commonDb.js functions"]
+    CommonDB --> setAccTitle["setAccTitle()"]
+    CommonDB --> getAccTitle["getAccTitle()"]
+    CommonDB --> setAccDescription["setAccDescription()"]
+    CommonDB --> getAccDescription["getAccDescription()"]
+    CommonDB --> setDiagramTitle["setDiagramTitle()"]
+    CommonDB --> getDiagramTitle["getDiagramTitle()"]
+    CommonDB --> commonClear["clear()"]
+    
+    %% Final Output
+    ProcessLinks --> FinalSVG["Final SVG Output"]
+    
+    %% Layout Algorithm Selection
+    SetupLayoutData --> LayoutAlgorithm{Layout Algorithm}
+    LayoutAlgorithm --> Dagre["dagre<br/>(default)"]
+    LayoutAlgorithm --> DagreWrapper["dagre-wrapper<br/>(v2 renderer)"]
+    LayoutAlgorithm --> ELK["elk<br/>(external package)"]
+    
+    %% Testing Components
+    FlowDBClass --> TestFiles["Test Files"]
+    TestFiles --> flowDbSpec["flowDb.spec.ts"]
+    TestFiles --> flowChartShapesSpec["flowChartShapes.spec.js"]
+    TestFiles --> ParserTests["parser/*.spec.js files<br/>- flow-text.spec.js<br/>- flow-edges.spec.js<br/>- flow-style.spec.js<br/>- subgraph.spec.js"]
+    
+    %% Configuration
+    Init --> ConfigSetup["Configuration Setup"]
+    ConfigSetup --> FlowchartConfig["cnf.flowchart config"]
+    ConfigSetup --> ArrowMarkers["arrowMarkerAbsolute"]
+    ConfigSetup --> LayoutConfig["layout config"]
+    ConfigSetup --> SetConfig["setConfig() calls"]

docs/diagrams/mermaid-api-sequence.mmd

@@ -0,0 +1,307 @@
+---
+references:
+  - "File: /packages/mermaid/src/mermaidAPI.ts"
+  - "File: /packages/mermaid/src/mermaid.ts"
+generationTime: 2025-01-28T16:30:00.000Z
+---
+sequenceDiagram
+    participant User as User/Browser
+    participant Mermaid as mermaid.ts
+    participant Queue as executionQueue
+    participant API as mermaidAPI.ts
+    participant Config as configApi
+    participant Preprocessor as preprocessDiagram
+    participant DiagramAPI as diagram-api
+    participant Diagram as Diagram.fromText
+    participant Renderer as diagram.renderer
+    participant Styles as Styling System
+    participant DOM as DOM/SVG
+
+    Note over User, DOM: Mermaid Complete API Flow
+
+    %% Initialization Phase
+    User->>+Mermaid: mermaid.initialize(config)
+    Mermaid->>+API: mermaidAPI.initialize(config)
+    
+    API->>API: assignWithDepth({}, userOptions)
+    API->>API: handle legacy fontFamily config
+    API->>Config: saveConfigFromInitialize(options)
+    
+    alt Theme Configuration Available
+        API->>API: check if theme in theme object
+        API->>API: set themeVariables from theme
+    else Default Theme
+        API->>API: use default theme variables
+    end
+    
+    API->>Config: setSiteConfig(options) or getSiteConfig()
+    API->>API: setLogLevel(config.logLevel)
+    API->>DiagramAPI: addDiagrams()
+    
+    API-->>-Mermaid: initialization complete
+    Mermaid-->>-User: ready to render
+
+    %% Content Loaded Event
+    User->>DOM: document.load event
+    DOM->>+Mermaid: contentLoaded()
+    
+    opt startOnLoad is true
+        Mermaid->>Config: getConfig()
+        Config-->>Mermaid: { startOnLoad: true }
+        Mermaid->>Mermaid: run()
+    end
+    
+    Mermaid-->>-DOM: event handling complete
+
+    %% Main Run Function
+    User->>+Mermaid: mermaid.run(options)
+    
+    Mermaid->>Mermaid: runThrowsErrors(options)
+    Mermaid->>Config: getConfig()
+    Config-->>Mermaid: configuration object
+    
+    alt nodes provided
+        Mermaid->>Mermaid: use provided nodes
+    else querySelector provided
+        Mermaid->>DOM: document.querySelectorAll(querySelector)
+        DOM-->>Mermaid: nodesToProcess
+    end
+    
+    Mermaid->>Mermaid: new InitIDGenerator(deterministicIds, seed)
+    
+    loop For each diagram element
+        Mermaid->>DOM: check element.getAttribute('data-processed')
+        
+        opt not processed
+            Mermaid->>DOM: element.setAttribute('data-processed', 'true')
+            Mermaid->>Mermaid: generate unique id
+            Mermaid->>DOM: get element.innerHTML
+            Mermaid->>Mermaid: entityDecode and clean text
+            Mermaid->>Mermaid: detectInit(txt)
+            
+            Mermaid->>Queue: render(id, txt, element)
+        end
+    end
+    
+    Mermaid-->>-User: processing initiated
+
+    %% Render Function (Queued)
+    activate Queue
+    Queue->>+API: mermaidAPI.render(id, text, container)
+    
+    API->>DiagramAPI: addDiagrams()
+    API->>+Preprocessor: processAndSetConfigs(text)
+    
+    Preprocessor->>Preprocessor: preprocessDiagram(text)
+    Preprocessor->>Config: reset()
+    Preprocessor->>Config: addDirective(processed.config)
+    Preprocessor-->>-API: { code, config }
+    
+    API->>Config: getConfig()
+    Config-->>API: current configuration
+    
+    opt text length > maxTextSize
+        API->>API: text = MAX_TEXTLENGTH_EXCEEDED_MSG
+    end
+    
+    API->>API: setup id selectors and element IDs
+    API->>API: determine security level (sandbox/loose)
+
+    %% DOM Setup
+    alt svgContainingElement provided
+        alt isSandboxed
+            API->>DOM: sandboxedIframe(select(svgContainingElement), iFrameID)
+            API->>DOM: select iframe contentDocument body
+        else
+            API->>DOM: select(svgContainingElement)
+        end
+    else no container
+        API->>API: removeExistingElements(document, id, divId, iFrameId)
+        alt isSandboxed
+            API->>DOM: sandboxedIframe(select('body'), iFrameID)
+        else
+            API->>DOM: select('body')
+        end
+    end
+    
+    API->>DOM: appendDivSvgG(root, id, enclosingDivID, fontFamily, XMLNS_XLINK_STD)
+
+    %% Diagram Creation
+    API->>+Diagram: Diagram.fromText(text, { title: processed.title })
+    
+    Diagram->>DiagramAPI: detect diagram type
+    Diagram->>DiagramAPI: load appropriate diagram
+    Diagram-->>-API: diagram instance
+    
+    opt parsing error occurred
+        API->>+Diagram: Diagram.fromText('error')
+        Diagram-->>-API: error diagram
+        API->>API: store parseEncounteredException
+    end
+
+    %% Style Generation
+    API->>DOM: get svg element and firstChild
+    API->>Renderer: diag.renderer.getClasses(text, diag)
+    Renderer-->>API: diagramClassDefs
+    
+    API->>+Styles: createUserStyles(config, diagramType, diagramClassDefs, idSelector)
+    
+    Styles->>Styles: createCssStyles(config, classDefs)
+    
+    opt config.themeCSS defined
+        Styles->>Styles: append themeCSS
+    end
+    
+    opt fontFamily configured
+        Styles->>Styles: add CSS variables for fonts
+    end
+    
+    opt classDefs exist
+        loop For each styleClassDef
+            opt has styles
+                Styles->>Styles: cssImportantStyles for each CSS element
+            end
+            opt has textStyles
+                Styles->>Styles: cssImportantStyles for tspan elements
+            end
+        end
+    end
+    
+    Styles->>Styles: getStyles(graphType, userCSSstyles, themeVariables)
+    Styles->>Styles: serialize(compile(svgId{allStyles}), stringify)
+    Styles-->>-API: compiled CSS rules
+    
+    API->>DOM: create style element
+    API->>DOM: style.innerHTML = rules
+    API->>DOM: svg.insertBefore(style, firstChild)
+
+    %% Diagram Rendering
+    API->>+Renderer: diag.renderer.draw(text, id, version, diag)
+    
+    Renderer->>Renderer: diagram-specific rendering logic
+    Renderer->>DOM: create SVG elements
+    Renderer->>DOM: apply positioning and styling
+    Renderer-->>-API: rendered diagram
+    
+    opt rendering error
+        alt suppressErrorRendering
+            API->>API: removeTempElements()
+            API->>Mermaid: throw error
+        else
+            API->>Renderer: errorRenderer.draw(text, id, version)
+        end
+    end
+
+    %% Accessibility and Cleanup
+    API->>DOM: select svg element
+    API->>Diagram: diag.db.getAccTitle()
+    API->>Diagram: diag.db.getAccDescription()
+    API->>API: addA11yInfo(diagramType, svgNode, a11yTitle, a11yDescr)
+    
+    API->>DOM: set xmlns for foreignobject elements
+    API->>DOM: get innerHTML from enclosing div
+    
+    API->>+API: cleanUpSvgCode(svgCode, isSandboxed, arrowMarkerAbsolute)
+    
+    opt not useArrowMarkerUrls and not sandboxed
+        API->>API: replace marker-end URLs with anchors
+    end
+    
+    API->>API: decodeEntities(svgCode)
+    API->>API: replace <br> with <br/>
+    API-->>-API: cleaned SVG code
+    
+    alt isSandboxed
+        API->>+API: putIntoIFrame(svgCode, svgEl)
+        API->>API: calculate iframe height
+        API->>API: toBase64 encode SVG content
+        API->>API: create iframe with sandbox attributes
+        API-->>-API: iframe HTML
+    else not loose security
+        API->>API: DOMPurify.sanitize(svgCode, options)
+    end
+    
+    API->>API: attachFunctions()
+    API->>API: removeTempElements()
+    
+    opt parseEncounteredException
+        API->>Mermaid: throw parseEncounteredException
+    end
+    
+    API-->>-Queue: { diagramType, svg: svgCode, bindFunctions }
+
+    %% Return to Web Integration
+    activate Mermaid
+    Queue-->>Mermaid: render result
+    Mermaid->>DOM: element.innerHTML = svg
+    
+    opt postRenderCallback
+        Mermaid->>User: postRenderCallback(id)
+    end
+    
+    opt bindFunctions exist
+        Mermaid->>DOM: bindFunctions(element)
+    end
+    deactivate Mermaid
+
+    %% Parse Function Flow
+    User->>+Mermaid: mermaid.parse(text, parseOptions)
+    activate Queue
+    
+    Queue->>+API: mermaidAPI.parse(text, parseOptions)
+    
+    API->>DiagramAPI: addDiagrams()
+    API->>Preprocessor: processAndSetConfigs(text)
+    Preprocessor-->>API: { code, config }
+    API->>Diagram: getDiagramFromText(code)
+    Diagram-->>API: diagram instance
+    API-->>-Queue: { diagramType: diagram.type, config }
+    
+    Queue-->>-Mermaid: parse result
+    Mermaid-->>-User: ParseResult or false
+
+    %% External Diagram Registration
+    User->>+Mermaid: registerExternalDiagrams(diagrams, options)
+    
+    Mermaid->>DiagramAPI: addDiagrams()
+    Mermaid->>DiagramAPI: registerLazyLoadedDiagrams(...diagrams)
+    
+    opt lazyLoad is false
+        Mermaid->>DiagramAPI: loadRegisteredDiagrams()
+    end
+    
+    Mermaid-->>-User: registration complete
+
+    %% Error Handling
+    Note over Mermaid, API: Error Handling Throughout
+    alt Error occurs
+        API->>Mermaid: throw error
+        Mermaid->>+Mermaid: handleError(error, errors, parseError)
+        
+        Mermaid->>Mermaid: log.warn(error)
+        
+        alt isDetailedError
+            Mermaid->>User: parseError(error.str, error.hash)
+        else
+            Mermaid->>User: parseError(error)
+        end
+        
+        opt not suppressErrors
+            Mermaid->>User: throw error
+        end
+        
+        Mermaid-->>-User: error handled
+    end
+
+    %% Configuration Details
+    Note over Config: Configuration Functions
+    Note right of Config: Functions:<br/>- reset()<br/>- getConfig()<br/>- setConfig()<br/>- getSiteConfig()<br/>- updateSiteConfig()<br/>- saveConfigFromInitialize()
+    
+    Note over Styles: CSS Generation
+    Note right of Styles: Features:<br/>- createCssStyles()<br/>- createUserStyles()<br/>- cssImportantStyles()<br/>- Theme integration<br/>- Class definitions
+    
+    Note over API: Security Levels
+    Note right of API: Modes:<br/>- sandbox: iframe isolation<br/>- loose: minimal sanitization<br/>- default: DOMPurify sanitization
+    
+    Note over API: Helper Functions
+    Note right of API: Utilities:<br/>- cleanUpSvgCode()<br/>- putIntoIFrame()<br/>- appendDivSvgG()<br/>- removeExistingElements() 

docs/diagrams/mindmap-implementation-sequence.mmd

@@ -0,0 +1,180 @@
+---
+references:
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmap-definition.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmapDb.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/detector.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmapTypes.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmapRenderer.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/styles.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/svgDraw.ts"
+generationTime: 2025-01-28T16:00:00.000Z
+---
+sequenceDiagram
+    participant User as User Input Text
+    participant Detector as detector.ts
+    participant Loader as DiagramLoader
+    participant Definition as mindmap-definition.ts
+    participant Parser as parser/mindmap.jison
+    participant DB as MindmapDB
+    participant Renderer as mindmapRenderer.ts
+    participant Cytoscape as cytoscape.js
+    participant SVGDraw as svgDraw.ts
+    participant Styles as styles.ts
+    participant Output as Final SVG
+
+    Note over User, Output: Mindmap Implementation Flow
+
+    %% Detection Phase
+    User->>Detector: /^\s*mindmap/ text input
+    activate Detector
+    Detector->>Detector: detector(txt) validates pattern
+    Detector->>Loader: loader() function called
+    deactivate Detector
+    
+    activate Loader
+    Loader->>Definition: import mindmap-definition.js
+    deactivate Loader
+
+    %% Core Structure Setup
+    activate Definition
+    Definition->>DB: get db() → new MindmapDB()
+    Definition->>Renderer: setup renderer
+    Definition->>Parser: setup parser
+    Definition->>Styles: setup styles
+    deactivate Definition
+
+    %% Database Initialization
+    activate DB
+    Note over DB: MindmapDB Constructor
+    DB->>DB: initialize nodes array
+    DB->>DB: setup nodeType constants
+    DB->>DB: bind methods
+    DB->>DB: clear() state
+    
+    %% Parsing Phase
+    activate Parser
+    User->>Parser: mindmap syntax text
+    
+    loop For each node in hierarchy
+        Parser->>DB: addNode(level, id, descr, type)
+        activate DB
+        DB->>DB: sanitizeText(id, descr)
+        DB->>DB: getType(startStr, endStr)
+        Note right of DB: Shape Detection:<br/>[ → RECT<br/>( → ROUNDED_RECT<br/>(( → CIRCLE<br/>)) → BANG<br/>{{ → HEXAGON
+        DB->>DB: getParent(level)
+        DB->>DB: create MindmapNode
+        DB->>DB: add to hierarchy
+        deactivate DB
+    end
+
+    opt Icon/Class Decoration
+        Parser->>DB: decorateNode(decoration)
+        DB->>DB: set icon/class properties
+    end
+    deactivate Parser
+
+    %% Data Preparation
+    Renderer->>DB: getData() for layout
+    activate DB
+    DB->>DB: collect all nodes
+    DB->>DB: build parent-child relationships
+    DB-->>Renderer: return node hierarchy
+    deactivate DB
+
+    %% Rendering Pipeline
+    activate Renderer
+    Note over Renderer: Rendering Phase
+    
+    Renderer->>Cytoscape: initialize cytoscape
+    activate Cytoscape
+    
+    loop For each node in mindmap
+        Renderer->>Cytoscape: addNodes(mindmap, cy, conf, level)
+        Cytoscape->>Cytoscape: create node data
+        Cytoscape->>Cytoscape: set position (x, y)
+    end
+
+    loop For parent-child relationships
+        Renderer->>Cytoscape: add edges
+        Cytoscape->>Cytoscape: create edge data
+    end
+
+    Renderer->>Cytoscape: configure cose-bilkent layout
+    Cytoscape->>Cytoscape: calculate optimal positions
+    Cytoscape-->>Renderer: return positioned graph
+    deactivate Cytoscape
+
+    %% SVG Generation
+    Renderer->>SVGDraw: drawNodes(db, svg, mindmap, section, conf)
+    activate SVGDraw
+    
+    loop For each node recursively
+        SVGDraw->>SVGDraw: select shape function
+        
+        alt Default Shape
+            SVGDraw->>SVGDraw: defaultBkg() - rounded rectangle
+        else Rectangle Shape
+            SVGDraw->>SVGDraw: rectBkg() - sharp corners
+        else Circle Shape
+            SVGDraw->>SVGDraw: circleBkg() - perfect circle
+        else Cloud Shape
+            SVGDraw->>SVGDraw: cloudBkg() - organic curves
+        else Bang Shape
+            SVGDraw->>SVGDraw: bangBkg() - explosion style
+        else Hexagon Shape
+            SVGDraw->>SVGDraw: hexagonBkg() - six sides
+        end
+        
+        SVGDraw->>SVGDraw: create SVG elements
+        SVGDraw->>SVGDraw: add text labels
+        SVGDraw->>SVGDraw: position node
+        
+        opt Node has children
+            SVGDraw->>SVGDraw: drawNodes() recursive call
+        end
+    end
+    deactivate SVGDraw
+
+    %% Edge Rendering
+    Renderer->>Renderer: drawEdges(edgesEl, cy)
+    loop For each edge
+        Renderer->>Renderer: extract edge bounds
+        Renderer->>Renderer: draw SVG path
+    end
+
+    %% Styling Application
+    Renderer->>Styles: getStyles(options)
+    activate Styles
+    
+    Styles->>Styles: genSections(options)
+    loop For THEME_COLOR_LIMIT sections
+        Styles->>Styles: generate color scale
+        Styles->>Styles: create CSS rules
+        Note right of Styles: .section-X fills<br/>.edge-depth-X widths<br/>.node-icon-X colors
+    end
+    
+    Styles->>Styles: apply theme integration
+    Styles-->>Renderer: return compiled CSS
+    deactivate Styles
+
+    %% Final Assembly
+    Renderer->>Output: selectSvgElement()
+    Renderer->>Output: setupGraphViewbox()
+    Renderer->>Output: apply styles
+    Renderer->>Output: add interactive elements
+    deactivate Renderer
+
+    activate Output
+    Note over Output: Final Mindmap Features
+    Output->>Output: responsive layout
+    Output->>Output: accessibility attributes
+    Output->>Output: hover effects
+    Output->>Output: click handling
+    Output-->>User: rendered mindmap
+    deactivate Output
+
+    %% Configuration Details
+    Note over DB, Styles: Configuration Options
+    Note right of DB: Padding Calculations:<br/>Base padding from config<br/>RECT: ×2 padding<br/>ROUNDED_RECT: ×2 padding<br/>HEXAGON: ×2 padding
+    Note right of Styles: Section Management:<br/>MAX_SECTIONS = 12<br/>Dynamic color generation<br/>Git theme integration
+    Note right of Renderer: Layout Parameters:<br/>Cytoscape configuration<br/>coseBilkent settings<br/>Node spacing rules 

docs/ecosystem/integrations-community.md

@@ -84,6 +84,7 @@ To add an integration to this list, see the [Integrations - create page](./integ
 LLM integrations to create mermaid diagrams using AI from text descriptions.
 
 - [HueHive - Create mermaid diagrams with text](https://huehive.co/tools/diagrams)
+- [MCP Server Mermaid](https://github.com/hustcc/mcp-mermaid) - Generate mermaid diagram and chart with AI MCP dynamically.
 
 ### CRM/ERP
 
@@ -103,6 +104,7 @@ Blogging frameworks and platforms
   - [Mermaid](https://nextra.site/docs/guide/mermaid)
 - [WordPress](https://wordpress.org)
   - [MerPRess](https://wordpress.org/plugins/merpress/)
+  - [WP Documentation](https://wordpress.org/themes/wp-documentation/)
 
 ### CMS/ECM
 

docs/ecosystem/integrations-create.md

@@ -16,9 +16,7 @@ Applications that support Mermaid files [SHOULD](https://datatracker.ietf.org/do
 
 ### MIME Type
 
-The recommended [MIME type](https://www.iana.org/assignments/media-types/media-types.xhtml) for Mermaid media is `text/vnd.mermaid`.
-
-Currently pending [IANA](https://www.iana.org/) recognition.
+The recommended [MIME type](https://www.iana.org/assignments/media-types/media-types.xhtml) for Mermaid media is [`text/vnd.mermaid`](https://www.iana.org/assignments/media-types/application/vnd.mermaid).
 
 ## Showcase
 

docs/syntax/flowchart.md

@@ -1795,15 +1795,54 @@ It is possible to style the type of curve used for lines between items, if the d
 Available curve styles include `basis`, `bumpX`, `bumpY`, `cardinal`, `catmullRom`, `linear`, `monotoneX`, `monotoneY`,
 `natural`, `step`, `stepAfter`, and `stepBefore`.
 
+For a full list of available curves, including an explanation of custom curves, refer to
+the [Shapes](https://d3js.org/d3-shape/curve) documentation in the [d3-shape](https://github.com/d3/d3-shape/) project.
+
+Line styling can be achieved in two ways:
+
+1. Change the curve style of all the lines
+2. Change the curve style of a particular line
+
+#### Diagram level curve style
+
 In this example, a left-to-right graph uses the `stepBefore` curve style:
 
 ```
-%%{ init: { 'flowchart': { 'curve': 'stepBefore' } } }%%
+---
+config:
+  flowchart:
+    curve: stepBefore
+---
 graph LR
 ```
 
-For a full list of available curves, including an explanation of custom curves, refer to
-the [Shapes](https://d3js.org/d3-shape/curve) documentation in the [d3-shape](https://github.com/d3/d3-shape/) project.
+#### Edge level curve style using Edge IDs (v\<MERMAID_RELEASE_VERSION>+)
+
+You can assign IDs to [edges](#attaching-an-id-to-edges). After assigning an ID you can modify the line style by modifying the edge's `curve` property using the following syntax:
+
+```mermaid-example
+flowchart LR
+    A e1@==> B
+    A e2@--> C
+    e1@{ curve: linear }
+    e2@{ curve: natural }
+```
+
+```mermaid
+flowchart LR
+    A e1@==> B
+    A e2@--> C
+    e1@{ curve: linear }
+    e2@{ curve: natural }
+```
+
+```info
+Any edge curve style modified at the edge level overrides the diagram level style.
+```
+
+```info
+If the same edge is modified multiple times the last modification will be rendered.
+```
 
 ### Styling a node
 

package.json

@@ -67,7 +67,7 @@
     "@argos-ci/cypress": "^5.0.2",
     "@changesets/changelog-github": "^0.5.1",
     "@changesets/cli": "^2.27.12",
-    "@cspell/eslint-plugin": "^8.19.3",
+    "@cspell/eslint-plugin": "^8.19.4",
     "@cypress/code-coverage": "^3.12.49",
     "@eslint/js": "^9.26.0",
     "@rollup/plugin-typescript": "^12.1.2",
@@ -94,17 +94,17 @@
     "cypress-split": "^1.24.14",
     "esbuild": "^0.25.0",
     "eslint": "^9.26.0",
-    "eslint-config-prettier": "^10.1.1",
+    "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-cypress": "^4.3.0",
-    "eslint-plugin-html": "^8.1.2",
-    "eslint-plugin-jest": "^28.11.0",
-    "eslint-plugin-jsdoc": "^50.6.9",
+    "eslint-plugin-html": "^8.1.3",
+    "eslint-plugin-jest": "^28.14.0",
+    "eslint-plugin-jsdoc": "^50.8.0",
     "eslint-plugin-json": "^4.0.1",
     "eslint-plugin-lodash": "^8.0.0",
     "eslint-plugin-markdown": "^5.1.0",
     "eslint-plugin-no-only-tests": "^3.3.0",
     "eslint-plugin-tsdoc": "^0.4.0",
-    "eslint-plugin-unicorn": "^59.0.0",
+    "eslint-plugin-unicorn": "^59.0.1",
     "express": "^5.1.0",
     "globals": "^16.0.0",
     "globby": "^14.0.2",
@@ -126,7 +126,7 @@
     "tslib": "^2.8.1",
     "tsx": "^4.7.3",
     "typescript": "~5.7.3",
-    "typescript-eslint": "^8.32.0",
+    "typescript-eslint": "^8.38.0",
     "vite": "^7.0.3",
     "vite-plugin-istanbul": "^7.0.0",
     "vitest": "^3.0.6"

packages/examples/README.md

@@ -0,0 +1,41 @@
+# @mermaid-js/examples
+
+The `@mermaid-js/examples` package contains a collection of examples used by tools like [mermaid.live](https://mermaid.live) to help users get started with new diagrams.
+
+You can duplicate an existing diagram example file, e.g., `packages/examples/src/examples/flowchart.ts`, and modify it with details specific to your diagram.
+
+Then, import the example in the `packages/examples/src/index.ts` file and add it to the `examples` array.
+
+Each diagram should have at least one example, which should be marked as the default. It's a good idea to add more examples to showcase different features of the diagram.
+
+## Usage
+
+```bash
+pnpm add @mermaid-js/examples
+```
+
+A sample usage of the package in mermaid.live, to get the default example for every diagram type:
+
+```ts
+import { diagramData } from '@mermaid-js/examples';
+
+type DiagramDefinition = (typeof diagramData)[number];
+
+const isValidDiagram = (diagram: DiagramDefinition): diagram is Required<DiagramDefinition> => {
+  return Boolean(diagram.name && diagram.examples && diagram.examples.length > 0);
+};
+
+export const getSampleDiagrams = () => {
+  const diagrams = diagramData
+    .filter((d) => isValidDiagram(d))
+    .map(({ examples, ...rest }) => ({
+      ...rest,
+      example: examples?.filter(({ isDefault }) => isDefault)[0],
+    }));
+  const examples: Record<string, string> = {};
+  for (const diagram of diagrams) {
+    examples[diagram.name.replace(/ (Diagram|Chart|Graph)/, '')] = diagram.example.code;
+  }
+  return examples;
+};
+```

packages/examples/package.json

@@ -16,6 +16,10 @@
   "files": [
     "dist"
   ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mermaid-js/mermaid"
+  },
   "scripts": {
     "clean": "rimraf dist"
   },

packages/mermaid-zenuml/README.md

@@ -1 +0,0 @@
-../mermaid/src/docs/syntax/zenuml.md

packages/mermaid-zenuml/README.md

@@ -0,0 +1,384 @@
+# @mermaid-js/mermaid-zenuml
+
+MermaidJS plugin for ZenUML integration - A powerful sequence diagram rendering engine.
+
+> A Sequence diagram is an interaction diagram that shows how processes operate with one another and in what order.
+
+Mermaid can render sequence diagrams with [ZenUML](https://zenuml.com). Note that ZenUML uses a different
+syntax than the original Sequence Diagram in mermaid.
+
+```mermaid
+zenuml
+    BookLibService.Borrow(id) {
+      User = Session.GetUser()
+      if(User.isActive) {
+        try {
+          BookRepository.Update(id, onLoan, User)
+          receipt = new Receipt(id, dueDate)
+        } catch (BookNotFoundException) {
+          ErrorService.onException(BookNotFoundException)
+        } finally {
+          Connection.close()
+        }
+      }
+      return receipt
+    }
+```
+
+## Installation
+
+### With bundlers
+
+```sh
+npm install @mermaid-js/mermaid-zenuml
+```
+
+```ts
+import mermaid from 'mermaid';
+import zenuml from '@mermaid-js/mermaid-zenuml';
+
+await mermaid.registerExternalDiagrams([zenuml]);
+```
+
+### With CDN
+
+```html
+<script type="module">
+  import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs';
+  import zenuml from 'https://cdn.jsdelivr.net/npm/@mermaid-js/mermaid-zenuml@0.2.0/dist/mermaid-zenuml.core.mjs';
+  await mermaid.registerExternalDiagrams([zenuml]);
+</script>
+```
+
+> [!NOTE]  
+> ZenUML uses experimental lazy loading & async rendering features which could change in the future.
+
+## Basic Usage
+
+Once the plugin is registered, you can create ZenUML diagrams using the `zenuml` syntax:
+
+```mermaid
+zenuml
+    Controller.Get(id) {
+        Service.Get(id) {
+            item = Repository.Get(id)
+            if(item) {
+                return item
+            } else {
+                return null
+            }
+        }
+        return result
+    }
+```
+
+## ZenUML Syntax Reference
+
+### Participants
+
+The participants can be defined implicitly as in the first example on this page. The participants or actors are
+rendered in order of appearance in the diagram source text. Sometimes you might want to show the participants in a
+different order than how they appear in the first message. It is possible to specify the actor's order of
+appearance by doing the following:
+
+```mermaid
+zenuml
+    title Declare participant (optional)
+    Bob
+    Alice
+    Alice->Bob: Hi Bob
+    Bob->Alice: Hi Alice
+```
+
+### Annotators
+
+If you specifically want to use symbols instead of just rectangles with text you can do so by using the annotator syntax to declare participants as per below.
+
+```mermaid
+zenuml
+    title Annotators
+    @Actor Alice
+    @Database Bob
+    Alice->Bob: Hi Bob
+    Bob->Alice: Hi Alice
+```
+
+Available annotators include:
+
+- `@Actor` - Human figure
+- `@Database` - Database symbol
+- `@Boundary` - Boundary symbol
+- `@Control` - Control symbol
+- `@Entity` - Entity symbol
+- `@Queue` - Queue symbol
+
+### Aliases
+
+The participants can have a convenient identifier and a descriptive label.
+
+```mermaid
+zenuml
+    title Aliases
+    A as Alice
+    J as John
+    A->J: Hello John, how are you?
+    J->A: Great!
+```
+
+## Messages
+
+Messages can be one of:
+
+1. Sync message
+2. Async message
+3. Creation message
+4. Reply message
+
+### Sync message
+
+You can think of a sync (blocking) method in a programming language.
+
+```mermaid
+zenuml
+    title Sync message
+    A.SyncMessage
+    A.SyncMessage(with, parameters) {
+      B.nestedSyncMessage()
+    }
+```
+
+### Async message
+
+You can think of an async (non-blocking) method in a programming language. Fire an event and forget about it.
+
+```mermaid
+zenuml
+    title Async message
+    Alice->Bob: How are you?
+```
+
+### Creation message
+
+We use `new` keyword to create an object.
+
+```mermaid
+zenuml
+    new A1
+    new A2(with, parameters)
+```
+
+### Reply message
+
+There are three ways to express a reply message:
+
+```mermaid
+zenuml
+    // 1. assign a variable from a sync message.
+    a = A.SyncMessage()
+
+    // 1.1. optionally give the variable a type
+    SomeType a = A.SyncMessage()
+
+    // 2. use return keyword
+    A.SyncMessage() {
+    return result
+    }
+
+    // 3. use @return or @reply annotator on an async message
+    @return
+    A->B: result
+```
+
+The third way `@return` is rarely used, but it is useful when you want to return to one level up.
+
+```mermaid
+zenuml
+    title Reply message
+    Client->A.method() {
+      B.method() {
+        if(condition) {
+          return x1
+          // return early
+          @return
+          A->Client: x11
+        }
+      }
+      return x2
+    }
+```
+
+## Advanced Features
+
+### Nesting
+
+Sync messages and Creation messages are naturally nestable with `{}`.
+
+```mermaid
+zenuml
+    A.method() {
+      B.nested_sync_method()
+      B->C: nested async message
+    }
+```
+
+### Comments
+
+It is possible to add comments to a sequence diagram with `// comment` syntax.
+Comments will be rendered above the messages or fragments. Comments on other places
+are ignored. Markdown is supported.
+
+```mermaid
+zenuml
+    // a comment on a participant will not be rendered
+    BookService
+    // a comment on a message.
+    // **Markdown** is supported.
+    BookService.getBook()
+```
+
+### Loops
+
+It is possible to express loops in a ZenUML diagram. This is done by any of the
+following notations:
+
+1. while
+2. for
+3. forEach, foreach
+4. loop
+
+```zenuml
+while(condition) {
+    ...statements...
+}
+```
+
+Example:
+
+```mermaid
+zenuml
+    Alice->John: Hello John, how are you?
+    while(true) {
+      John->Alice: Great!
+    }
+```
+
+### Alt (Alternative paths)
+
+It is possible to express alternative paths in a sequence diagram. This is done by the notation
+
+```zenuml
+if(condition1) {
+    ...statements...
+} else if(condition2) {
+    ...statements...
+} else {
+    ...statements...
+}
+```
+
+Example:
+
+```mermaid
+zenuml
+    Alice->Bob: Hello Bob, how are you?
+    if(is_sick) {
+      Bob->Alice: Not so good :(
+    } else {
+      Bob->Alice: Feeling fresh like a daisy
+    }
+```
+
+### Opt (Optional)
+
+It is possible to render an `opt` fragment. This is done by the notation
+
+```zenuml
+opt {
+  ...statements...
+}
+```
+
+Example:
+
+```mermaid
+zenuml
+    Alice->Bob: Hello Bob, how are you?
+    Bob->Alice: Not so good :(
+    opt {
+      Bob->Alice: Thanks for asking
+    }
+```
+
+### Parallel
+
+It is possible to show actions that are happening in parallel.
+
+This is done by the notation
+
+```zenuml
+par {
+  statement1
+  statement2
+  statement3
+}
+```
+
+Example:
+
+```mermaid
+zenuml
+    par {
+        Alice->Bob: Hello guys!
+        Alice->John: Hello guys!
+    }
+```
+
+### Try/Catch/Finally (Break)
+
+It is possible to indicate a stop of the sequence within the flow (usually used to model exceptions).
+
+This is done by the notation
+
+```
+try {
+  ...statements...
+} catch {
+  ...statements...
+} finally {
+  ...statements...
+}
+```
+
+Example:
+
+```mermaid
+zenuml
+    try {
+      Consumer->API: Book something
+      API->BookingService: Start booking process
+    } catch {
+      API->Consumer: show failure
+    } finally {
+      API->BookingService: rollback status
+    }
+```
+
+## Contributing
+
+This package is part of the [Mermaid](https://github.com/mermaid-js/mermaid) project. See the main repository for contributing guidelines.
+
+## Contributors
+
+- [Peng Xiao](https://github.com/MrCoder)
+- [Sidharth Vinod](https://sidharth.dev)
+- [Dong Cai](https://github.com/dontry)
+
+## License
+
+MIT
+
+## Links
+
+- [ZenUML Official Website](https://zenuml.com)
+- [Mermaid Documentation](https://mermaid.js.org)
+- [GitHub Repository](https://github.com/mermaid-js/mermaid)

packages/mermaid-zenuml/package.json

@@ -33,7 +33,7 @@
   ],
   "license": "MIT",
   "dependencies": {
-    "@zenuml/core": "^3.31.1"
+    "@zenuml/core": "^3.35.2"
   },
   "devDependencies": {
     "mermaid": "workspace:^"

packages/mermaid-zenuml/src/zenuml.d.ts

@@ -0,0 +1,11 @@
+declare module '@zenuml/core' {
+  interface RenderOptions {
+    theme?: string;
+    mode?: string;
+  }
+
+  export default class ZenUml {
+    constructor(container: Element);
+    render(text: string, options?: RenderOptions): Promise<void>;
+  }
+}

packages/mermaid-zenuml/src/zenumlRenderer.ts

@@ -53,7 +53,6 @@ export const draw = async function (text: string, id: string) {
 
   const { foreignObject, container, app } = createForeignObject(id);
   svgContainer.appendChild(foreignObject);
-  // @ts-expect-error @zenuml/core@3.0.0 exports the wrong type for ZenUml
   const zenuml = new ZenUml(app);
   // default is a theme name. More themes to be added and will be configurable in the future
   await zenuml.render(text, { theme: 'default', mode: 'static' });

packages/mermaid/src/diagram-api/diagram-orchestration.spec.ts

@@ -78,5 +78,41 @@ describe('diagram-orchestration', () => {
       flowchart: 1 "pie" pie: 2 "pie"`)
       ).toBe('pie');
     });
+
+    it('should detect proper diagram when defaultRenderer is elk for flowchart', () => {
+      expect(
+        detectType('mindmap\n  root\n    Photograph\n      Waterfall', {
+          flowchart: { defaultRenderer: 'elk' },
+        })
+      ).toBe('mindmap');
+      expect(
+        detectType(
+          `
+          classDiagram
+            class Person {
+              +String name
+              -Int id
+              #double age
+              +Text demographicProfile
+            }
+          `,
+          { flowchart: { defaultRenderer: 'elk' } }
+        )
+      ).toBe('class');
+      expect(
+        detectType(
+          `
+          erDiagram
+            p[Photograph] {
+              varchar(12) jobId
+              date dateCreated
+            }
+          `,
+          {
+            flowchart: { defaultRenderer: 'elk' },
+          }
+        )
+      ).toBe('er');
+    });
   });
 });

packages/mermaid/src/diagram-api/diagram-orchestration.ts

@@ -28,6 +28,7 @@ import architecture from '../diagrams/architecture/architectureDetector.js';
 import { registerLazyLoadedDiagrams } from './detectType.js';
 import { registerDiagram } from './diagramAPI.js';
 import { treemap } from '../diagrams/treemap/detector.js';
+import { usecase } from '../diagrams/usecase/detector.js';
 import '../type.d.ts';
 
 let hasLoadedDiagrams = false;
@@ -101,6 +102,7 @@ export const addDiagrams = () => {
     xychart,
     block,
     radar,
-    treemap
+    treemap,
+    usecase
   );
 };

packages/mermaid/src/diagrams/architecture/architecture.spec.ts

@@ -1,21 +1,12 @@
 import { it, describe, expect } from 'vitest';
-import { db } from './architectureDb.js';
 import { parser } from './architectureParser.js';
-
-const {
-  clear,
-  getDiagramTitle,
-  getAccTitle,
-  getAccDescription,
-  getServices,
-  getGroups,
-  getEdges,
-  getJunctions,
-} = db;
-
+import { ArchitectureDB } from './architectureDb.js';
 describe('architecture diagrams', () => {
+  let db: ArchitectureDB;
   beforeEach(() => {
-    clear();
+    db = new ArchitectureDB();
+    // @ts-expect-error since type is set to undefined we will have error
+    parser.parser?.yy = db;
   });
 
   describe('architecture diagram definitions', () => {
@@ -36,7 +27,7 @@ describe('architecture diagrams', () => {
     it('should handle title on the first line', async () => {
       const str = `architecture-beta title Simple Architecture Diagram`;
       await expect(parser.parse(str)).resolves.not.toThrow();
-      expect(getDiagramTitle()).toBe('Simple Architecture Diagram');
+      expect(db.getDiagramTitle()).toBe('Simple Architecture Diagram');
     });
 
     it('should handle title on another line', async () => {
@@ -44,7 +35,7 @@ describe('architecture diagrams', () => {
             title Simple Architecture Diagram
             `;
       await expect(parser.parse(str)).resolves.not.toThrow();
-      expect(getDiagramTitle()).toBe('Simple Architecture Diagram');
+      expect(db.getDiagramTitle()).toBe('Simple Architecture Diagram');
     });
 
     it('should handle accessibility title and description', async () => {
@@ -53,8 +44,8 @@ describe('architecture diagrams', () => {
             accDescr: Accessibility Description
             `;
       await expect(parser.parse(str)).resolves.not.toThrow();
-      expect(getAccTitle()).toBe('Accessibility Title');
-      expect(getAccDescription()).toBe('Accessibility Description');
+      expect(db.getAccTitle()).toBe('Accessibility Title');
+      expect(db.getAccDescription()).toBe('Accessibility Description');
     });
 
     it('should handle multiline accessibility description', async () => {
@@ -64,7 +55,7 @@ describe('architecture diagrams', () => {
             }
             `;
       await expect(parser.parse(str)).resolves.not.toThrow();
-      expect(getAccDescription()).toBe('Accessibility Description');
+      expect(db.getAccDescription()).toBe('Accessibility Description');
     });
   });
 });

packages/mermaid/src/diagrams/architecture/architectureDb.ts

@@ -1,8 +1,9 @@
+import { getConfig as commonGetConfig } from '../../config.js';
 import type { ArchitectureDiagramConfig } from '../../config.type.js';
 import DEFAULT_CONFIG from '../../defaultConfig.js';
-import { getConfig as commonGetConfig } from '../../config.js';
+import type { DiagramDB } from '../../diagram-api/types.js';
 import type { D3Element } from '../../types.js';
-import { ImperativeState } from '../../utils/imperativeState.js';
+import { cleanAndMerge } from '../../utils.js';
 import {
   clear as commonClear,
   getAccDescription,
@@ -14,7 +15,6 @@ import {
 } from '../common/commonDb.js';
 import type {
   ArchitectureAlignment,
-  ArchitectureDB,
   ArchitectureDirectionPair,
   ArchitectureDirectionPairMap,
   ArchitectureEdge,
@@ -33,330 +33,333 @@ import {
   isArchitectureService,
   shiftPositionByArchitectureDirectionPair,
 } from './architectureTypes.js';
-import { cleanAndMerge } from '../../utils.js';
 
 const DEFAULT_ARCHITECTURE_CONFIG: Required<ArchitectureDiagramConfig> =
   DEFAULT_CONFIG.architecture;
+export class ArchitectureDB implements DiagramDB {
+  private nodes: Record<string, ArchitectureNode> = {};
+  private groups: Record<string, ArchitectureGroup> = {};
+  private edges: ArchitectureEdge[] = [];
+  private registeredIds: Record<string, 'node' | 'group'> = {};
+  private dataStructures?: ArchitectureState['dataStructures'];
+  private elements: Record<string, D3Element> = {};
 
-const state = new ImperativeState<ArchitectureState>(() => ({
-  nodes: {},
-  groups: {},
-  edges: [],
-  registeredIds: {},
-  config: DEFAULT_ARCHITECTURE_CONFIG,
-  dataStructures: undefined,
-  elements: {},
-}));
-
-const clear = (): void => {
-  state.reset();
-  commonClear();
-};
-
-const addService = function ({
-  id,
-  icon,
-  in: parent,
-  title,
-  iconText,
-}: Omit<ArchitectureService, 'edges'>) {
-  if (state.records.registeredIds[id] !== undefined) {
-    throw new Error(
-      `The service id [${id}] is already in use by another ${state.records.registeredIds[id]}`
-    );
-  }
-  if (parent !== undefined) {
-    if (id === parent) {
-      throw new Error(`The service [${id}] cannot be placed within itself`);
-    }
-    if (state.records.registeredIds[parent] === undefined) {
-      throw new Error(
-        `The service [${id}]'s parent does not exist. Please make sure the parent is created before this service`
-      );
-    }
-    if (state.records.registeredIds[parent] === 'node') {
-      throw new Error(`The service [${id}]'s parent is not a group`);
-    }
+  constructor() {
+    this.clear();
   }
 
-  state.records.registeredIds[id] = 'node';
+  public clear(): void {
+    this.nodes = {};
+    this.groups = {};
+    this.edges = [];
+    this.registeredIds = {};
+    this.dataStructures = undefined;
+    this.elements = {};
+    commonClear();
+  }
 
-  state.records.nodes[id] = {
+  public addService({
     id,
-    type: 'service',
     icon,
+    in: parent,
+    title,
     iconText,
-    title,
-    edges: [],
-    in: parent,
-  };
-};
-
-const getServices = (): ArchitectureService[] =>
-  Object.values(state.records.nodes).filter<ArchitectureService>(isArchitectureService);
-
-const addJunction = function ({ id, in: parent }: Omit<ArchitectureJunction, 'edges'>) {
-  state.records.registeredIds[id] = 'node';
-
-  state.records.nodes[id] = {
-    id,
-    type: 'junction',
-    edges: [],
-    in: parent,
-  };
-};
-
-const getJunctions = (): ArchitectureJunction[] =>
-  Object.values(state.records.nodes).filter<ArchitectureJunction>(isArchitectureJunction);
-
-const getNodes = (): ArchitectureNode[] => Object.values(state.records.nodes);
-
-const getNode = (id: string): ArchitectureNode | null => state.records.nodes[id];
-
-const addGroup = function ({ id, icon, in: parent, title }: ArchitectureGroup) {
-  if (state.records.registeredIds[id] !== undefined) {
-    throw new Error(
-      `The group id [${id}] is already in use by another ${state.records.registeredIds[id]}`
-    );
-  }
-  if (parent !== undefined) {
-    if (id === parent) {
-      throw new Error(`The group [${id}] cannot be placed within itself`);
-    }
-    if (state.records.registeredIds[parent] === undefined) {
+  }: Omit<ArchitectureService, 'edges'>): void {
+    if (this.registeredIds[id] !== undefined) {
       throw new Error(
-        `The group [${id}]'s parent does not exist. Please make sure the parent is created before this group`
+        `The service id [${id}] is already in use by another ${this.registeredIds[id]}`
       );
     }
-    if (state.records.registeredIds[parent] === 'node') {
-      throw new Error(`The group [${id}]'s parent is not a group`);
+    if (parent !== undefined) {
+      if (id === parent) {
+        throw new Error(`The service [${id}] cannot be placed within itself`);
+      }
+      if (this.registeredIds[parent] === undefined) {
+        throw new Error(
+          `The service [${id}]'s parent does not exist. Please make sure the parent is created before this service`
+        );
+      }
+      if (this.registeredIds[parent] === 'node') {
+        throw new Error(`The service [${id}]'s parent is not a group`);
+      }
     }
+
+    this.registeredIds[id] = 'node';
+
+    this.nodes[id] = {
+      id,
+      type: 'service',
+      icon,
+      iconText,
+      title,
+      edges: [],
+      in: parent,
+    };
   }
 
-  state.records.registeredIds[id] = 'group';
-
-  state.records.groups[id] = {
-    id,
-    icon,
-    title,
-    in: parent,
-  };
-};
-const getGroups = (): ArchitectureGroup[] => {
-  return Object.values(state.records.groups);
-};
-
-const addEdge = function ({
-  lhsId,
-  rhsId,
-  lhsDir,
-  rhsDir,
-  lhsInto,
-  rhsInto,
-  lhsGroup,
-  rhsGroup,
-  title,
-}: ArchitectureEdge<string>) {
-  if (!isArchitectureDirection(lhsDir)) {
-    throw new Error(
-      `Invalid direction given for left hand side of edge ${lhsId}--${rhsId}. Expected (L,R,T,B) got ${lhsDir}`
-    );
-  }
-  if (!isArchitectureDirection(rhsDir)) {
-    throw new Error(
-      `Invalid direction given for right hand side of edge ${lhsId}--${rhsId}. Expected (L,R,T,B) got ${rhsDir}`
-    );
+  public getServices(): ArchitectureService[] {
+    return Object.values(this.nodes).filter(isArchitectureService);
   }
 
-  if (state.records.nodes[lhsId] === undefined && state.records.groups[lhsId] === undefined) {
-    throw new Error(
-      `The left-hand id [${lhsId}] does not yet exist. Please create the service/group before declaring an edge to it.`
-    );
-  }
-  if (state.records.nodes[rhsId] === undefined && state.records.groups[lhsId] === undefined) {
-    throw new Error(
-      `The right-hand id [${rhsId}] does not yet exist. Please create the service/group before declaring an edge to it.`
-    );
+  public addJunction({ id, in: parent }: Omit<ArchitectureJunction, 'edges'>): void {
+    this.registeredIds[id] = 'node';
+
+    this.nodes[id] = {
+      id,
+      type: 'junction',
+      edges: [],
+      in: parent,
+    };
   }
 
-  const lhsGroupId = state.records.nodes[lhsId].in;
-  const rhsGroupId = state.records.nodes[rhsId].in;
-  if (lhsGroup && lhsGroupId && rhsGroupId && lhsGroupId == rhsGroupId) {
-    throw new Error(
-      `The left-hand id [${lhsId}] is modified to traverse the group boundary, but the edge does not pass through two groups.`
-    );
-  }
-  if (rhsGroup && lhsGroupId && rhsGroupId && lhsGroupId == rhsGroupId) {
-    throw new Error(
-      `The right-hand id [${rhsId}] is modified to traverse the group boundary, but the edge does not pass through two groups.`
-    );
+  public getJunctions(): ArchitectureJunction[] {
+    return Object.values(this.nodes).filter(isArchitectureJunction);
   }
 
-  const edge = {
+  public getNodes(): ArchitectureNode[] {
+    return Object.values(this.nodes);
+  }
+
+  public getNode(id: string): ArchitectureNode | null {
+    return this.nodes[id] ?? null;
+  }
+
+  public addGroup({ id, icon, in: parent, title }: ArchitectureGroup): void {
+    if (this.registeredIds?.[id] !== undefined) {
+      throw new Error(
+        `The group id [${id}] is already in use by another ${this.registeredIds[id]}`
+      );
+    }
+    if (parent !== undefined) {
+      if (id === parent) {
+        throw new Error(`The group [${id}] cannot be placed within itself`);
+      }
+      if (this.registeredIds?.[parent] === undefined) {
+        throw new Error(
+          `The group [${id}]'s parent does not exist. Please make sure the parent is created before this group`
+        );
+      }
+      if (this.registeredIds?.[parent] === 'node') {
+        throw new Error(`The group [${id}]'s parent is not a group`);
+      }
+    }
+
+    this.registeredIds[id] = 'group';
+
+    this.groups[id] = {
+      id,
+      icon,
+      title,
+      in: parent,
+    };
+  }
+  public getGroups(): ArchitectureGroup[] {
+    return Object.values(this.groups);
+  }
+  public addEdge({
     lhsId,
-    lhsDir,
-    lhsInto,
-    lhsGroup,
     rhsId,
+    lhsDir,
     rhsDir,
+    lhsInto,
     rhsInto,
+    lhsGroup,
     rhsGroup,
     title,
-  };
-
-  state.records.edges.push(edge);
-  if (state.records.nodes[lhsId] && state.records.nodes[rhsId]) {
-    state.records.nodes[lhsId].edges.push(state.records.edges[state.records.edges.length - 1]);
-    state.records.nodes[rhsId].edges.push(state.records.edges[state.records.edges.length - 1]);
-  }
-};
-
-const getEdges = (): ArchitectureEdge[] => state.records.edges;
-
-/**
- * Returns the current diagram's adjacency list, spatial map, & group alignments.
- * If they have not been created, run the algorithms to generate them.
- * @returns
- */
-const getDataStructures = () => {
-  if (state.records.dataStructures === undefined) {
-    // Tracks how groups are aligned with one another. Generated while creating the adj list
-    const groupAlignments: Record<
-      string,
-      Record<string, Exclude<ArchitectureAlignment, 'bend'>>
-    > = {};
-
-    // Create an adjacency list of the diagram to perform BFS on
-    // Outer reduce applied on all services
-    // Inner reduce applied on the edges for a service
-    const adjList = Object.entries(state.records.nodes).reduce<
-      Record<string, ArchitectureDirectionPairMap>
-    >((prevOuter, [id, service]) => {
-      prevOuter[id] = service.edges.reduce<ArchitectureDirectionPairMap>((prevInner, edge) => {
-        // track the direction groups connect to one another
-        const lhsGroupId = getNode(edge.lhsId)?.in;
-        const rhsGroupId = getNode(edge.rhsId)?.in;
-        if (lhsGroupId && rhsGroupId && lhsGroupId !== rhsGroupId) {
-          const alignment = getArchitectureDirectionAlignment(edge.lhsDir, edge.rhsDir);
-          if (alignment !== 'bend') {
-            groupAlignments[lhsGroupId] ??= {};
-            groupAlignments[lhsGroupId][rhsGroupId] = alignment;
-            groupAlignments[rhsGroupId] ??= {};
-            groupAlignments[rhsGroupId][lhsGroupId] = alignment;
-          }
-        }
-
-        if (edge.lhsId === id) {
-          // source is LHS
-          const pair = getArchitectureDirectionPair(edge.lhsDir, edge.rhsDir);
-          if (pair) {
-            prevInner[pair] = edge.rhsId;
-          }
-        } else {
-          // source is RHS
-          const pair = getArchitectureDirectionPair(edge.rhsDir, edge.lhsDir);
-          if (pair) {
-            prevInner[pair] = edge.lhsId;
-          }
-        }
-        return prevInner;
-      }, {});
-      return prevOuter;
-    }, {});
-
-    // Configuration for the initial pass of BFS
-    const firstId = Object.keys(adjList)[0];
-    const visited = { [firstId]: 1 };
-    // If a key is present in this object, it has not been visited
-    const notVisited = Object.keys(adjList).reduce(
-      (prev, id) => (id === firstId ? prev : { ...prev, [id]: 1 }),
-      {} as Record<string, number>
-    );
-
-    // Perform BFS on the adjacency list
-    const BFS = (startingId: string): ArchitectureSpatialMap => {
-      const spatialMap = { [startingId]: [0, 0] };
-      const queue = [startingId];
-      while (queue.length > 0) {
-        const id = queue.shift();
-        if (id) {
-          visited[id] = 1;
-          delete notVisited[id];
-          const adj = adjList[id];
-          const [posX, posY] = spatialMap[id];
-          Object.entries(adj).forEach(([dir, rhsId]) => {
-            if (!visited[rhsId]) {
-              spatialMap[rhsId] = shiftPositionByArchitectureDirectionPair(
-                [posX, posY],
-                dir as ArchitectureDirectionPair
-              );
-              queue.push(rhsId);
-            }
-          });
-        }
-      }
-      return spatialMap;
-    };
-    const spatialMaps = [BFS(firstId)];
-
-    // If our diagram is disconnected, keep adding additional spatial maps until all disconnected graphs have been found
-    while (Object.keys(notVisited).length > 0) {
-      spatialMaps.push(BFS(Object.keys(notVisited)[0]));
+  }: ArchitectureEdge): void {
+    if (!isArchitectureDirection(lhsDir)) {
+      throw new Error(
+        `Invalid direction given for left hand side of edge ${lhsId}--${rhsId}. Expected (L,R,T,B) got ${String(lhsDir)}`
+      );
     }
-    state.records.dataStructures = {
-      adjList,
-      spatialMaps,
-      groupAlignments,
+    if (!isArchitectureDirection(rhsDir)) {
+      throw new Error(
+        `Invalid direction given for right hand side of edge ${lhsId}--${rhsId}. Expected (L,R,T,B) got ${String(rhsDir)}`
+      );
+    }
+
+    if (this.nodes[lhsId] === undefined && this.groups[lhsId] === undefined) {
+      throw new Error(
+        `The left-hand id [${lhsId}] does not yet exist. Please create the service/group before declaring an edge to it.`
+      );
+    }
+    if (this.nodes[rhsId] === undefined && this.groups[rhsId] === undefined) {
+      throw new Error(
+        `The right-hand id [${rhsId}] does not yet exist. Please create the service/group before declaring an edge to it.`
+      );
+    }
+
+    const lhsGroupId = this.nodes[lhsId].in;
+    const rhsGroupId = this.nodes[rhsId].in;
+    if (lhsGroup && lhsGroupId && rhsGroupId && lhsGroupId == rhsGroupId) {
+      throw new Error(
+        `The left-hand id [${lhsId}] is modified to traverse the group boundary, but the edge does not pass through two groups.`
+      );
+    }
+    if (rhsGroup && lhsGroupId && rhsGroupId && lhsGroupId == rhsGroupId) {
+      throw new Error(
+        `The right-hand id [${rhsId}] is modified to traverse the group boundary, but the edge does not pass through two groups.`
+      );
+    }
+
+    const edge = {
+      lhsId,
+      lhsDir,
+      lhsInto,
+      lhsGroup,
+      rhsId,
+      rhsDir,
+      rhsInto,
+      rhsGroup,
+      title,
     };
+
+    this.edges.push(edge);
+    if (this.nodes[lhsId] && this.nodes[rhsId]) {
+      this.nodes[lhsId].edges.push(this.edges[this.edges.length - 1]);
+      this.nodes[rhsId].edges.push(this.edges[this.edges.length - 1]);
+    }
   }
-  return state.records.dataStructures;
-};
 
-const setElementForId = (id: string, element: D3Element) => {
-  state.records.elements[id] = element;
-};
-const getElementById = (id: string) => state.records.elements[id];
+  public getEdges(): ArchitectureEdge[] {
+    return this.edges;
+  }
 
-const getConfig = (): Required<ArchitectureDiagramConfig> => {
-  const config = cleanAndMerge({
-    ...DEFAULT_ARCHITECTURE_CONFIG,
-    ...commonGetConfig().architecture,
-  });
-  return config;
-};
+  /**
+   * Returns the current diagram's adjacency list, spatial map, & group alignments.
+   * If they have not been created, run the algorithms to generate them.
+   * @returns
+   */
+  public getDataStructures() {
+    if (this.dataStructures === undefined) {
+      // Tracks how groups are aligned with one another. Generated while creating the adj list
+      const groupAlignments: Record<
+        string,
+        Record<string, Exclude<ArchitectureAlignment, 'bend'>>
+      > = {};
 
-export const db: ArchitectureDB = {
-  clear,
-  setDiagramTitle,
-  getDiagramTitle,
-  setAccTitle,
-  getAccTitle,
-  setAccDescription,
-  getAccDescription,
-  getConfig,
+      // Create an adjacency list of the diagram to perform BFS on
+      // Outer reduce applied on all services
+      // Inner reduce applied on the edges for a service
+      const adjList = Object.entries(this.nodes).reduce<
+        Record<string, ArchitectureDirectionPairMap>
+      >((prevOuter, [id, service]) => {
+        prevOuter[id] = service.edges.reduce<ArchitectureDirectionPairMap>((prevInner, edge) => {
+          // track the direction groups connect to one another
+          const lhsGroupId = this.getNode(edge.lhsId)?.in;
+          const rhsGroupId = this.getNode(edge.rhsId)?.in;
+          if (lhsGroupId && rhsGroupId && lhsGroupId !== rhsGroupId) {
+            const alignment = getArchitectureDirectionAlignment(edge.lhsDir, edge.rhsDir);
+            if (alignment !== 'bend') {
+              groupAlignments[lhsGroupId] ??= {};
+              groupAlignments[lhsGroupId][rhsGroupId] = alignment;
+              groupAlignments[rhsGroupId] ??= {};
+              groupAlignments[rhsGroupId][lhsGroupId] = alignment;
+            }
+          }
 
-  addService,
-  getServices,
-  addJunction,
-  getJunctions,
-  getNodes,
-  getNode,
-  addGroup,
-  getGroups,
-  addEdge,
-  getEdges,
-  setElementForId,
-  getElementById,
-  getDataStructures,
-};
+          if (edge.lhsId === id) {
+            // source is LHS
+            const pair = getArchitectureDirectionPair(edge.lhsDir, edge.rhsDir);
+            if (pair) {
+              prevInner[pair] = edge.rhsId;
+            }
+          } else {
+            // source is RHS
+            const pair = getArchitectureDirectionPair(edge.rhsDir, edge.lhsDir);
+            if (pair) {
+              prevInner[pair] = edge.lhsId;
+            }
+          }
+          return prevInner;
+        }, {});
+        return prevOuter;
+      }, {});
+
+      // Configuration for the initial pass of BFS
+      const firstId = Object.keys(adjList)[0];
+      const visited = { [firstId]: 1 };
+      // If a key is present in this object, it has not been visited
+      const notVisited = Object.keys(adjList).reduce(
+        (prev, id) => (id === firstId ? prev : { ...prev, [id]: 1 }),
+        {} as Record<string, number>
+      );
+
+      // Perform BFS on the adjacency list
+      const BFS = (startingId: string): ArchitectureSpatialMap => {
+        const spatialMap = { [startingId]: [0, 0] };
+        const queue = [startingId];
+        while (queue.length > 0) {
+          const id = queue.shift();
+          if (id) {
+            visited[id] = 1;
+            delete notVisited[id];
+            const adj = adjList[id];
+            const [posX, posY] = spatialMap[id];
+            Object.entries(adj).forEach(([dir, rhsId]) => {
+              if (!visited[rhsId]) {
+                spatialMap[rhsId] = shiftPositionByArchitectureDirectionPair(
+                  [posX, posY],
+                  dir as ArchitectureDirectionPair
+                );
+                queue.push(rhsId);
+              }
+            });
+          }
+        }
+        return spatialMap;
+      };
+      const spatialMaps = [BFS(firstId)];
+
+      // If our diagram is disconnected, keep adding additional spatial maps until all disconnected graphs have been found
+      while (Object.keys(notVisited).length > 0) {
+        spatialMaps.push(BFS(Object.keys(notVisited)[0]));
+      }
+      this.dataStructures = {
+        adjList,
+        spatialMaps,
+        groupAlignments,
+      };
+    }
+    return this.dataStructures;
+  }
+
+  public setElementForId(id: string, element: D3Element): void {
+    this.elements[id] = element;
+  }
+
+  public getElementById(id: string): D3Element {
+    return this.elements[id];
+  }
+
+  public getConfig(): Required<ArchitectureDiagramConfig> {
+    return cleanAndMerge({
+      ...DEFAULT_ARCHITECTURE_CONFIG,
+      ...commonGetConfig().architecture,
+    });
+  }
+
+  public getConfigField<T extends keyof ArchitectureDiagramConfig>(
+    field: T
+  ): Required<ArchitectureDiagramConfig>[T] {
+    return this.getConfig()[field];
+  }
+
+  public setAccTitle = setAccTitle;
+  public getAccTitle = getAccTitle;
+  public setDiagramTitle = setDiagramTitle;
+  public getDiagramTitle = getDiagramTitle;
+  public getAccDescription = getAccDescription;
+  public setAccDescription = setAccDescription;
+}
 
 /**
  * Typed wrapper for resolving an architecture diagram's config fields. Returns the default value if undefined
  * @param field - the config field to access
  * @returns
  */
-export function getConfigField<T extends keyof ArchitectureDiagramConfig>(
-  field: T
-): Required<ArchitectureDiagramConfig>[T] {
-  return getConfig()[field];
-}
+// export function getConfigField<T extends keyof ArchitectureDiagramConfig>(
+//   field: T
+// ): Required<ArchitectureDiagramConfig>[T] {
+//   return db.getConfig()[field];
+// }

packages/mermaid/src/diagrams/architecture/architectureDiagram.ts

@@ -1,12 +1,14 @@
 import type { DiagramDefinition } from '../../diagram-api/types.js';
 import { parser } from './architectureParser.js';
-import { db } from './architectureDb.js';
+import { ArchitectureDB } from './architectureDb.js';
 import styles from './architectureStyles.js';
 import { renderer } from './architectureRenderer.js';
 
 export const diagram: DiagramDefinition = {
   parser,
-  db,
+  get db() {
+    return new ArchitectureDB();
+  },
   renderer,
   styles,
 };

packages/mermaid/src/diagrams/architecture/architectureParser.ts

@@ -1,24 +1,33 @@
 import type { Architecture } from '@mermaid-js/parser';
 import { parse } from '@mermaid-js/parser';
-import { log } from '../../logger.js';
 import type { ParserDefinition } from '../../diagram-api/types.js';
+import { log } from '../../logger.js';
 import { populateCommonDb } from '../common/populateCommonDb.js';
-import type { ArchitectureDB } from './architectureTypes.js';
-import { db } from './architectureDb.js';
+import { ArchitectureDB } from './architectureDb.js';
 
 const populateDb = (ast: Architecture, db: ArchitectureDB) => {
   populateCommonDb(ast, db);
-  ast.groups.map(db.addGroup);
+  ast.groups.map((group) => db.addGroup(group));
   ast.services.map((service) => db.addService({ ...service, type: 'service' }));
   ast.junctions.map((service) => db.addJunction({ ...service, type: 'junction' }));
   // @ts-ignore TODO our parser guarantees the type is L/R/T/B and not string. How to change to union type?
-  ast.edges.map(db.addEdge);
+  ast.edges.map((edge) => db.addEdge(edge));
 };
 
 export const parser: ParserDefinition = {
+  parser: {
+    // @ts-expect-error - ArchitectureDB is not assignable to DiagramDB
+    yy: undefined,
+  },
   parse: async (input: string): Promise<void> => {
     const ast: Architecture = await parse('architecture', input);
     log.debug(ast);
+    const db = parser.parser?.yy;
+    if (!(db instanceof ArchitectureDB)) {
+      throw new Error(
+        'parser.parser?.yy was not a ArchitectureDB. This is due to a bug within Mermaid, please report this issue at https://github.com/mermaid-js/mermaid/issues.'
+      );
+    }
     populateDb(ast, db);
   },
 };

packages/mermaid/src/diagrams/architecture/architectureRenderer.ts

@@ -1,4 +1,3 @@
-import { registerIconPacks } from '../../rendering-util/icons.js';
 import type { Position } from 'cytoscape';
 import cytoscape from 'cytoscape';
 import type { FcoseLayoutOptions } from 'cytoscape-fcose';
@@ -7,9 +6,10 @@ import { select } from 'd3';
 import type { DrawDefinition, SVG } from '../../diagram-api/types.js';
 import type { Diagram } from '../../Diagram.js';
 import { log } from '../../logger.js';
+import { registerIconPacks } from '../../rendering-util/icons.js';
 import { selectSvgElement } from '../../rendering-util/selectSvgElement.js';
 import { setupGraphViewbox } from '../../setupGraphViewbox.js';
-import { getConfigField } from './architectureDb.js';
+import type { ArchitectureDB } from './architectureDb.js';
 import { architectureIcons } from './architectureIcons.js';
 import type {
   ArchitectureAlignment,
@@ -22,7 +22,6 @@ import type {
   NodeSingularData,
 } from './architectureTypes.js';
 import {
-  type ArchitectureDB,
   type ArchitectureDirection,
   type ArchitectureEdge,
   type ArchitectureGroup,
@@ -44,7 +43,7 @@ registerIconPacks([
 ]);
 cytoscape.use(fcose);
 
-function addServices(services: ArchitectureService[], cy: cytoscape.Core) {
+function addServices(services: ArchitectureService[], cy: cytoscape.Core, db: ArchitectureDB) {
   services.forEach((service) => {
     cy.add({
       group: 'nodes',
@@ -54,15 +53,15 @@ function addServices(services: ArchitectureService[], cy: cytoscape.Core) {
         icon: service.icon,
         label: service.title,
         parent: service.in,
-        width: getConfigField('iconSize'),
-        height: getConfigField('iconSize'),
+        width: db.getConfigField('iconSize'),
+        height: db.getConfigField('iconSize'),
       } as NodeSingularData,
       classes: 'node-service',
     });
   });
 }
 
-function addJunctions(junctions: ArchitectureJunction[], cy: cytoscape.Core) {
+function addJunctions(junctions: ArchitectureJunction[], cy: cytoscape.Core, db: ArchitectureDB) {
   junctions.forEach((junction) => {
     cy.add({
       group: 'nodes',
@@ -70,8 +69,8 @@ function addJunctions(junctions: ArchitectureJunction[], cy: cytoscape.Core) {
         type: 'junction',
         id: junction.id,
         parent: junction.in,
-        width: getConfigField('iconSize'),
-        height: getConfigField('iconSize'),
+        width: db.getConfigField('iconSize'),
+        height: db.getConfigField('iconSize'),
       } as NodeSingularData,
       classes: 'node-junction',
     });
@@ -257,7 +256,8 @@ function getAlignments(
 }
 
 function getRelativeConstraints(
-  spatialMaps: ArchitectureSpatialMap[]
+  spatialMaps: ArchitectureSpatialMap[],
+  db: ArchitectureDB
 ): fcose.FcoseRelativePlacementConstraint[] {
   const relativeConstraints: fcose.FcoseRelativePlacementConstraint[] = [];
   const posToStr = (pos: number[]) => `${pos[0]},${pos[1]}`;
@@ -296,7 +296,7 @@ function getRelativeConstraints(
                 [ArchitectureDirectionName[
                   getOppositeArchitectureDirection(dir as ArchitectureDirection)
                 ]]: currId,
-                gap: 1.5 * getConfigField('iconSize'),
+                gap: 1.5 * db.getConfigField('iconSize'),
               });
             }
           });
@@ -353,7 +353,7 @@ function layoutArchitecture(
           style: {
             'text-valign': 'bottom',
             'text-halign': 'center',
-            'font-size': `${getConfigField('fontSize')}px`,
+            'font-size': `${db.getConfigField('fontSize')}px`,
           },
         },
         {
@@ -375,7 +375,7 @@ function layoutArchitecture(
           selector: '.node-group',
           style: {
             // @ts-ignore Incorrect library types
-            padding: `${getConfigField('padding')}px`,
+            padding: `${db.getConfigField('padding')}px`,
           },
         },
       ],
@@ -393,14 +393,14 @@ function layoutArchitecture(
     renderEl.remove();
 
     addGroups(groups, cy);
-    addServices(services, cy);
-    addJunctions(junctions, cy);
+    addServices(services, cy, db);
+    addJunctions(junctions, cy, db);
     addEdges(edges, cy);
     // Use the spatial map to create alignment arrays for fcose
     const alignmentConstraint = getAlignments(db, spatialMaps, groupAlignments);
 
     // Create the relative constraints for fcose by using an inverse of the spatial map and performing BFS on it
-    const relativePlacementConstraint = getRelativeConstraints(spatialMaps);
+    const relativePlacementConstraint = getRelativeConstraints(spatialMaps, db);
 
     const layout = cy.layout({
       name: 'fcose',
@@ -415,7 +415,9 @@ function layoutArchitecture(
         const { parent: parentA } = nodeData(nodeA);
         const { parent: parentB } = nodeData(nodeB);
         const elasticity =
-          parentA === parentB ? 1.5 * getConfigField('iconSize') : 0.5 * getConfigField('iconSize');
+          parentA === parentB
+            ? 1.5 * db.getConfigField('iconSize')
+            : 0.5 * db.getConfigField('iconSize');
         return elasticity;
       },
       edgeElasticity(edge: EdgeSingular) {
@@ -535,11 +537,11 @@ export const draw: DrawDefinition = async (text, id, _version, diagObj: Diagram)
 
   const cy = await layoutArchitecture(services, junctions, groups, edges, db, ds);
 
-  await drawEdges(edgesElem, cy);
-  await drawGroups(groupElem, cy);
+  await drawEdges(edgesElem, cy, db);
+  await drawGroups(groupElem, cy, db);
   positionNodes(db, cy);
 
-  setupGraphViewbox(undefined, svg, getConfigField('padding'), getConfigField('useMaxWidth'));
+  setupGraphViewbox(undefined, svg, db.getConfigField('padding'), db.getConfigField('useMaxWidth'));
 };
 
 export const renderer = { draw };

packages/mermaid/src/diagrams/architecture/svgDraw.ts

@@ -1,9 +1,9 @@
-import { getIconSVG } from '../../rendering-util/icons.js';
 import type cytoscape from 'cytoscape';
 import { getConfig } from '../../diagram-api/diagramAPI.js';
 import { createText } from '../../rendering-util/createText.js';
+import { getIconSVG } from '../../rendering-util/icons.js';
 import type { D3Element } from '../../types.js';
-import { db, getConfigField } from './architectureDb.js';
+import type { ArchitectureDB } from './architectureDb.js';
 import { architectureIcons } from './architectureIcons.js';
 import {
   ArchitectureDirectionArrow,
@@ -16,14 +16,17 @@ import {
   isArchitectureDirectionY,
   isArchitecturePairXY,
   nodeData,
-  type ArchitectureDB,
   type ArchitectureJunction,
   type ArchitectureService,
 } from './architectureTypes.js';
 
-export const drawEdges = async function (edgesEl: D3Element, cy: cytoscape.Core) {
-  const padding = getConfigField('padding');
-  const iconSize = getConfigField('iconSize');
+export const drawEdges = async function (
+  edgesEl: D3Element,
+  cy: cytoscape.Core,
+  db: ArchitectureDB
+) {
+  const padding = db.getConfigField('padding');
+  const iconSize = db.getConfigField('iconSize');
   const halfIconSize = iconSize / 2;
   const arrowSize = iconSize / 6;
   const halfArrowSize = arrowSize / 2;
@@ -183,13 +186,17 @@ export const drawEdges = async function (edgesEl: D3Element, cy: cytoscape.Core)
   );
 };
 
-export const drawGroups = async function (groupsEl: D3Element, cy: cytoscape.Core) {
-  const padding = getConfigField('padding');
+export const drawGroups = async function (
+  groupsEl: D3Element,
+  cy: cytoscape.Core,
+  db: ArchitectureDB
+) {
+  const padding = db.getConfigField('padding');
   const groupIconSize = padding * 0.75;
 
-  const fontSize = getConfigField('fontSize');
+  const fontSize = db.getConfigField('fontSize');
 
-  const iconSize = getConfigField('iconSize');
+  const iconSize = db.getConfigField('iconSize');
   const halfIconSize = iconSize / 2;
 
   await Promise.all(
@@ -266,7 +273,7 @@ export const drawServices = async function (
 ): Promise<number> {
   for (const service of services) {
     const serviceElem = elem.append('g');
-    const iconSize = getConfigField('iconSize');
+    const iconSize = db.getConfigField('iconSize');
 
     if (service.title) {
       const textElem = serviceElem.append('g');
@@ -350,7 +357,7 @@ export const drawJunctions = function (
 ) {
   junctions.forEach((junction) => {
     const junctionElem = elem.append('g');
-    const iconSize = getConfigField('iconSize');
+    const iconSize = db.getConfigField('iconSize');
 
     const bkgElem = junctionElem.append('g');
     bkgElem

packages/mermaid/src/diagrams/block/blockDB.ts

@@ -92,7 +92,20 @@ export const setCssClass = function (itemIds: string, cssClassName: string) {
 const populateBlockDatabase = (_blockList: Block[], parent: Block): void => {
   const blockList = _blockList.flat();
   const children = [];
+  const columnSettingBlock = blockList.find((b) => b?.type === 'column-setting');
+  const column = columnSettingBlock?.columns ?? -1;
   for (const block of blockList) {
+    if (
+      typeof column === 'number' &&
+      column > 0 &&
+      block.type !== 'column-setting' &&
+      typeof block.widthInColumns === 'number' &&
+      block.widthInColumns > column
+    ) {
+      log.warn(
+        `Block ${block.id} width ${block.widthInColumns} exceeds configured column width ${column}`
+      );
+    }
     if (block.label) {
       block.label = sanitizeText(block.label);
     }

packages/mermaid/src/diagrams/block/layout.ts

@@ -270,7 +270,12 @@ function layoutBlocks(block: Block, db: BlockDB) {
       if (child.children) {
         layoutBlocks(child, db);
       }
-      columnPos += child?.widthInColumns ?? 1;
+      let columnsFilled = child?.widthInColumns ?? 1;
+      if (columns > 0) {
+        // Make sure overflowing lines do not affect later lines
+        columnsFilled = Math.min(columnsFilled, columns - (columnPos % columns));
+      }
+      columnPos += columnsFilled;
       log.debug('abc88 columnsPos', child, columnPos);
     }
   }

packages/mermaid/src/diagrams/block/parser/block.spec.ts

@@ -1,6 +1,7 @@
 // @ts-ignore: jison doesn't export types
 import block from './block.jison';
 import db from '../blockDB.js';
+import { log } from '../../../logger.js';
 
 describe('Block diagram', function () {
   describe('when parsing a block diagram graph it should handle > ', function () {
@@ -402,6 +403,25 @@ columns 1
       const B = blocks[0];
       expect(B.styles).toContain('fill:#f9F');
     });
+    it('should log a warning when block width exceeds column width', () => {
+      const str = `block-beta
+  columns 1
+  A:1
+  B:2
+  C:3
+  D:4
+  E:3
+  F:2
+  G:1`;
+
+      const logWarnSpy = vi.spyOn(log, 'warn').mockImplementation(() => undefined);
+
+      block.parse(str);
+
+      expect(logWarnSpy).toHaveBeenCalledWith('Block B width 2 exceeds configured column width 1');
+
+      logWarnSpy.mockRestore();
+    });
   });
 
   describe('prototype properties', function () {

packages/mermaid/src/diagrams/class/parser/class.spec.js

@@ -15,4 +15,12 @@ describe('class diagram', function () {
       expect(() => parser.parse(`classDiagram\nnamespace ${prop} {\n\tclass A\n}`)).not.toThrow();
     });
   });
+
+  describe('backtick escaping', function () {
+    it('should handle backtick-quoted namespace names', function () {
+      expect(() =>
+        parser.parse(`classDiagram\nnamespace \`A::B\` {\n\tclass \`IPC::Sender\`\n}`)
+      ).not.toThrow();
+    });
+  });
 });

packages/mermaid/src/diagrams/class/parser/classDiagram.jison

@@ -242,6 +242,7 @@ classLabel
 
 namespaceName
     : alphaNumToken { $$=$1; }
+    | classLiteralName { $$=$1; }
     | alphaNumToken DOT namespaceName { $$=$1+'.'+$3; }
     | alphaNumToken namespaceName { $$=$1+$2; }
     ;

packages/mermaid/src/diagrams/flowchart/elk/detector.ts

@@ -11,7 +11,7 @@ const detector: DiagramDetector = (txt, config = {}): boolean => {
     // If diagram explicitly states flowchart-elk
     /^\s*flowchart-elk/.test(txt) ||
     // If a flowchart/graph diagram has their default renderer set to elk
-    (/^\s*flowchart|graph/.test(txt) && config?.flowchart?.defaultRenderer === 'elk')
+    (/^\s*(flowchart|graph)/.test(txt) && config?.flowchart?.defaultRenderer === 'elk')
   ) {
     config.layout = 'elk';
     return true;

packages/mermaid/src/diagrams/flowchart/flowDb.spec.ts

@@ -125,4 +125,60 @@ describe('flow db getData', () => {
     const { edges } = flowDb.getData();
     expect(edges[0].curve).toBe('basis');
   });
+
+  it('should support modifying interpolate using edge id syntax', () => {
+    flowDb.addVertex('A', { text: 'A', type: 'text' }, undefined, [], [], '', {}, undefined);
+    flowDb.addVertex('B', { text: 'B', type: 'text' }, undefined, [], [], '', {}, undefined);
+    flowDb.addVertex('C', { text: 'C', type: 'text' }, undefined, [], [], '', {}, undefined);
+    flowDb.addVertex('D', { text: 'D', type: 'text' }, undefined, [], [], '', {}, undefined);
+    flowDb.addLink(['A'], ['B'], {});
+    flowDb.addLink(['A'], ['C'], { id: 'e2' });
+    flowDb.addLink(['B'], ['D'], { id: 'e3' });
+    flowDb.addLink(['C'], ['D'], {});
+    flowDb.updateLinkInterpolate(['default'], 'stepBefore');
+    flowDb.updateLinkInterpolate([0], 'basis');
+    flowDb.addVertex(
+      'e2',
+      { text: 'Shouldnt be used', type: 'text' },
+      undefined,
+      [],
+      [],
+      '',
+      {},
+      ' curve: monotoneX '
+    );
+    flowDb.addVertex(
+      'e3',
+      { text: 'Shouldnt be used', type: 'text' },
+      undefined,
+      [],
+      [],
+      '',
+      {},
+      ' curve: catmullRom '
+    );
+
+    const { edges } = flowDb.getData();
+    expect(edges[0].curve).toBe('basis');
+    expect(edges[1].curve).toBe('monotoneX');
+    expect(edges[2].curve).toBe('catmullRom');
+    expect(edges[3].curve).toBe('stepBefore');
+  });
+});
+
+describe('flow db direction', () => {
+  let flowDb: FlowDB;
+  beforeEach(() => {
+    flowDb = new FlowDB();
+  });
+
+  it('should set direction to TB when TD is set', () => {
+    flowDb.setDirection('TD');
+    expect(flowDb.getDirection()).toBe('TB');
+  });
+
+  it('should correctly set direction irrespective of leading spaces', () => {
+    flowDb.setDirection(' TD');
+    expect(flowDb.getDirection()).toBe('TB');
+  });
 });

packages/mermaid/src/diagrams/flowchart/flowDb.ts

@@ -139,6 +139,9 @@ export class FlowDB implements DiagramDB {
       if (edgeDoc?.animation !== undefined) {
         edge.animation = edgeDoc.animation;
       }
+      if (edgeDoc?.curve !== undefined) {
+        edge.interpolate = edgeDoc.curve;
+      }
       return;
     }
 
@@ -403,7 +406,8 @@ You have to call mermaid.initialize.`
    *
    */
   public setDirection(dir: string) {
-    this.direction = dir;
+    this.direction = dir.trim();
+
     if (/.*</.exec(this.direction)) {
       this.direction = 'RL';
     }

packages/mermaid/src/diagrams/flowchart/parser/flow-lines.spec.js

@@ -37,6 +37,59 @@ describe('[Lines] when parsing', () => {
     expect(edges[1].interpolate).toBe('cardinal');
   });
 
+  it('should handle edge curve properties using edge ID', function () {
+    const res = flow.parser.parse(
+      'graph TD\n' +
+        'A e1@-->B\n' +
+        'A uniqueName@-->C\n' +
+        'e1@{curve: basis}\n' +
+        'uniqueName@{curve: cardinal}'
+    );
+
+    const vert = flow.parser.yy.getVertices();
+    const edges = flow.parser.yy.getEdges();
+
+    expect(edges[0].interpolate).toBe('basis');
+    expect(edges[1].interpolate).toBe('cardinal');
+  });
+
+  it('should handle edge curve properties using edge ID but without overriding default', function () {
+    const res = flow.parser.parse(
+      'graph TD\n' +
+        'A e1@-->B\n' +
+        'A-->C\n' +
+        'linkStyle default interpolate linear\n' +
+        'e1@{curve: stepAfter}'
+    );
+
+    const vert = flow.parser.yy.getVertices();
+    const edges = flow.parser.yy.getEdges();
+
+    expect(edges[0].interpolate).toBe('stepAfter');
+    expect(edges.defaultInterpolate).toBe('linear');
+  });
+
+  it('should handle edge curve properties using edge ID mixed with line interpolation', function () {
+    const res = flow.parser.parse(
+      'graph TD\n' +
+        'A e1@-->B-->D\n' +
+        'A-->C e4@-->D-->E\n' +
+        'linkStyle default interpolate linear\n' +
+        'linkStyle 1 interpolate basis\n' +
+        'e1@{curve: monotoneX}\n' +
+        'e4@{curve: stepBefore}'
+    );
+
+    const vert = flow.parser.yy.getVertices();
+    const edges = flow.parser.yy.getEdges();
+
+    expect(edges[0].interpolate).toBe('monotoneX');
+    expect(edges[1].interpolate).toBe('basis');
+    expect(edges.defaultInterpolate).toBe('linear');
+    expect(edges[3].interpolate).toBe('stepBefore');
+    expect(edges.defaultInterpolate).toBe('linear');
+  });
+
   it('should handle line interpolation multi-numbered definitions', function () {
     const res = flow.parser.parse(
       'graph TD\n' + 'A-->B\n' + 'A-->C\n' + 'linkStyle 0,1 interpolate basis'

packages/mermaid/src/diagrams/packet/db.ts

@@ -1,6 +1,7 @@
 import { getConfig as commonGetConfig } from '../../config.js';
 import type { PacketDiagramConfig } from '../../config.type.js';
 import DEFAULT_CONFIG from '../../defaultConfig.js';
+import type { DiagramDB } from '../../diagram-api/types.js';
 import { cleanAndMerge } from '../../utils.js';
 import {
   clear as commonClear,
@@ -11,49 +12,42 @@ import {
   setAccTitle,
   setDiagramTitle,
 } from '../common/commonDb.js';
-import type { PacketDB, PacketData, PacketWord } from './types.js';
-
-const defaultPacketData: PacketData = {
-  packet: [],
-};
-
-let data: PacketData = structuredClone(defaultPacketData);
-
+import type { PacketWord } from './types.js';
 const DEFAULT_PACKET_CONFIG: Required<PacketDiagramConfig> = DEFAULT_CONFIG.packet;
 
-const getConfig = (): Required<PacketDiagramConfig> => {
-  const config = cleanAndMerge({
-    ...DEFAULT_PACKET_CONFIG,
-    ...commonGetConfig().packet,
-  });
-  if (config.showBits) {
-    config.paddingY += 10;
+export class PacketDB implements DiagramDB {
+  private packet: PacketWord[] = [];
+
+  public getConfig() {
+    const config = cleanAndMerge({
+      ...DEFAULT_PACKET_CONFIG,
+      ...commonGetConfig().packet,
+    });
+    if (config.showBits) {
+      config.paddingY += 10;
+    }
+    return config;
   }
-  return config;
-};
 
-const getPacket = (): PacketWord[] => data.packet;
-
-const pushWord = (word: PacketWord) => {
-  if (word.length > 0) {
-    data.packet.push(word);
+  public getPacket() {
+    return this.packet;
   }
-};
 
-const clear = () => {
-  commonClear();
-  data = structuredClone(defaultPacketData);
-};
+  public pushWord(word: PacketWord) {
+    if (word.length > 0) {
+      this.packet.push(word);
+    }
+  }
 
-export const db: PacketDB = {
-  pushWord,
-  getPacket,
-  getConfig,
-  clear,
-  setAccTitle,
-  getAccTitle,
-  setDiagramTitle,
-  getDiagramTitle,
-  getAccDescription,
-  setAccDescription,
-};
+  public clear() {
+    commonClear();
+    this.packet = [];
+  }
+
+  public setAccTitle = setAccTitle;
+  public getAccTitle = getAccTitle;
+  public setDiagramTitle = setDiagramTitle;
+  public getDiagramTitle = getDiagramTitle;
+  public getAccDescription = getAccDescription;
+  public setAccDescription = setAccDescription;
+}

packages/mermaid/src/diagrams/packet/diagram.ts

@@ -1,12 +1,14 @@
 import type { DiagramDefinition } from '../../diagram-api/types.js';
-import { db } from './db.js';
+import { PacketDB } from './db.js';
 import { parser } from './parser.js';
 import { renderer } from './renderer.js';
 import { styles } from './styles.js';
 
 export const diagram: DiagramDefinition = {
   parser,
-  db,
+  get db() {
+    return new PacketDB();
+  },
   renderer,
   styles,
 };

packages/mermaid/src/diagrams/packet/packet.spec.ts

@@ -1,24 +1,26 @@
 import { it, describe, expect } from 'vitest';
-import { db } from './db.js';
+import { PacketDB } from './db.js';
 import { parser } from './parser.js';
 
-const { clear, getPacket, getDiagramTitle, getAccTitle, getAccDescription } = db;
-
 describe('packet diagrams', () => {
+  let db: PacketDB;
   beforeEach(() => {
-    clear();
+    db = new PacketDB();
+    if (parser.parser) {
+      parser.parser.yy = db;
+    }
   });
 
   it('should handle a packet-beta definition', async () => {
     const str = `packet-beta`;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot('[]');
+    expect(db.getPacket()).toMatchInlineSnapshot('[]');
   });
 
   it('should handle a packet definition', async () => {
     const str = `packet`;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot('[]');
+    expect(db.getPacket()).toMatchInlineSnapshot('[]');
   });
 
   it('should handle diagram with data and title', async () => {
@@ -29,10 +31,10 @@ describe('packet diagrams', () => {
     0-10: "test"
     `;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getDiagramTitle()).toMatchInlineSnapshot('"Packet diagram"');
-    expect(getAccTitle()).toMatchInlineSnapshot('"Packet accTitle"');
-    expect(getAccDescription()).toMatchInlineSnapshot('"Packet accDescription"');
-    expect(getPacket()).toMatchInlineSnapshot(`
+    expect(db.getDiagramTitle()).toMatchInlineSnapshot('"Packet diagram"');
+    expect(db.getAccTitle()).toMatchInlineSnapshot('"Packet accTitle"');
+    expect(db.getAccDescription()).toMatchInlineSnapshot('"Packet accDescription"');
+    expect(db.getPacket()).toMatchInlineSnapshot(`
       [
         [
           {
@@ -52,7 +54,7 @@ describe('packet diagrams', () => {
     11: "single"
     `;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot(`
+    expect(db.getPacket()).toMatchInlineSnapshot(`
       [
         [
           {
@@ -78,7 +80,7 @@ describe('packet diagrams', () => {
     +16: "word"
     `;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot(`
+    expect(db.getPacket()).toMatchInlineSnapshot(`
       [
         [
           {
@@ -104,7 +106,7 @@ describe('packet diagrams', () => {
     +16: "word"
     `;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot(`
+    expect(db.getPacket()).toMatchInlineSnapshot(`
       [
         [
           {
@@ -130,7 +132,7 @@ describe('packet diagrams', () => {
     11-90: "multiple"
     `;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot(`
+    expect(db.getPacket()).toMatchInlineSnapshot(`
       [
         [
           {
@@ -172,7 +174,7 @@ describe('packet diagrams', () => {
     17-63: "multiple"
     `;
     await expect(parser.parse(str)).resolves.not.toThrow();
-    expect(getPacket()).toMatchInlineSnapshot(`
+    expect(db.getPacket()).toMatchInlineSnapshot(`
       [
         [
           {

packages/mermaid/src/diagrams/packet/parser.ts

@@ -3,12 +3,12 @@ import { parse } from '@mermaid-js/parser';
 import type { ParserDefinition } from '../../diagram-api/types.js';
 import { log } from '../../logger.js';
 import { populateCommonDb } from '../common/populateCommonDb.js';
-import { db } from './db.js';
+import { PacketDB } from './db.js';
 import type { PacketBlock, PacketWord } from './types.js';
 
 const maxPacketSize = 10_000;
 
-const populate = (ast: Packet) => {
+const populate = (ast: Packet, db: PacketDB) => {
   populateCommonDb(ast, db);
   let lastBit = -1;
   let word: PacketWord = [];
@@ -91,9 +91,17 @@ const getNextFittingBlock = (
 };
 
 export const parser: ParserDefinition = {
+  // @ts-expect-error - PacketDB is not assignable to DiagramDB
+  parser: { yy: undefined },
   parse: async (input: string): Promise<void> => {
     const ast: Packet = await parse('packet', input);
+    const db = parser.parser?.yy;
+    if (!(db instanceof PacketDB)) {
+      throw new Error(
+        'parser.parser?.yy was not a PacketDB. This is due to a bug within Mermaid, please report this issue at https://github.com/mermaid-js/mermaid/issues.'
+      );
+    }
     log.debug(ast);
-    populate(ast);
+    populate(ast, db);
   },
 };

packages/mermaid/src/diagrams/usecase/db.ts

@@ -0,0 +1,38 @@
+import type { DiagramDB } from '../../diagram-api/types.js';
+import type { UsecaseDiagramConfig, UsecaseNode } from './types.js';
+import { cleanAndMerge } from '../../utils.js';
+
+export class UsecaseDiagramDB implements DiagramDB {
+  public getNodes() {
+    return [];
+  }
+
+  public getConfig() {
+    return cleanAndMerge({}) as Required<UsecaseDiagramConfig>;
+  }
+
+  public addNode(node: UsecaseNode, level: number) {
+    if (level === 0) {
+      // TODO
+    }
+  }
+
+  public getRoot() {
+    return { name: '', children: [] };
+  }
+
+  public addClass(_id: string, _style: string) {
+    // TODO
+  }
+  public getClasses() {
+    // TODO
+  }
+
+  public getStylesForClass(_classSelector: string) {
+    // TODO
+  }
+
+  public clear() {
+    // commonClear();
+  }
+}

packages/mermaid/src/diagrams/usecase/detector.ts

@@ -0,0 +1,22 @@
+import type {
+  DiagramDetector,
+  DiagramLoader,
+  ExternalDiagramDefinition,
+} from '../../diagram-api/types.js';
+
+const id = 'usecase';
+
+const detector: DiagramDetector = (txt) => {
+  return /^\s*usecase/.test(txt);
+};
+
+const loader: DiagramLoader = async () => {
+  const { diagram } = await import('./diagram.js');
+  return { id, diagram };
+};
+
+export const usecase: ExternalDiagramDefinition = {
+  id,
+  detector,
+  loader,
+};

packages/mermaid/src/diagrams/usecase/diagram.ts

@@ -0,0 +1,14 @@
+import type { DiagramDefinition } from '../../diagram-api/types.js';
+import { UsecaseDiagramDB } from './db.js';
+import { parser } from './parser.js';
+import { renderer } from './renderer.js';
+import styles from './styles.js';
+
+export const diagram: DiagramDefinition = {
+  parser,
+  get db() {
+    return new UsecaseDiagramDB();
+  },
+  renderer,
+  styles,
+};

packages/mermaid/src/diagrams/usecase/parser.ts

@@ -0,0 +1,40 @@
+import { parse } from '@mermaid-js/parser';
+import type { ParserDefinition } from '../../diagram-api/types.js';
+import { log } from '../../logger.js';
+import { populateCommonDb } from '../common/populateCommonDb.js';
+import type { UsecaseAst } from './types.js';
+import { UsecaseDiagramDB } from './db.js';
+
+/**
+ * Populates the database with data from the Usecase AST
+ * @param ast - The Usecase AST
+ */
+const populate = (ast: UsecaseAst, db: UsecaseDiagramDB) => {
+  // We need to bypass the type checking for populateCommonDb
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  populateCommonDb(ast as any, db);
+};
+
+export const parser: ParserDefinition = {
+  // @ts-expect-error - UsecaseDB is not assignable to DiagramDB
+  parser: { yy: undefined },
+  parse: async (text: string): Promise<void> => {
+    try {
+      // Use a generic parse that accepts any diagram type
+
+      const parseFunc = parse as (diagramType: string, text: string) => Promise<UsecaseAst>;
+      const ast = await parseFunc('usecase', text);
+      log.debug('Usecase AST:', ast);
+      const db = parser.parser?.yy;
+      if (!(db instanceof UsecaseDiagramDB)) {
+        throw new Error(
+          'parser.parser?.yy was not a UsecaseDiagramDB. This is due to a bug within Mermaid, please report this issue at https://github.com/mermaid-js/mermaid/issues.'
+        );
+      }
+      populate(ast, db);
+    } catch (error) {
+      log.error('Error parsing usecase:', error);
+      throw error;
+    }
+  },
+};

packages/mermaid/src/diagrams/usecase/renderer.ts

@@ -0,0 +1,21 @@
+import type { Diagram } from '../../Diagram.js';
+import type {
+  DiagramRenderer,
+  DiagramStyleClassDef,
+  DrawDefinition,
+} from '../../diagram-api/types.js';
+
+/**
+ * Draws the Usecase diagram
+ */
+const draw: DrawDefinition = (_text, _id, _version, _diagram: Diagram) => {
+  // TODO: Implement the draw function for the usecase diagram
+};
+
+const getClasses = function (
+  _text: string,
+  _diagramObj: Pick<Diagram, 'db'>
+): Map<string, DiagramStyleClassDef> {
+  return new Map<string, DiagramStyleClassDef>();
+};
+export const renderer: DiagramRenderer = { draw, getClasses };

packages/mermaid/src/diagrams/usecase/styles.ts

@@ -0,0 +1,51 @@
+import type { DiagramStylesProvider } from '../../diagram-api/types.js';
+import { cleanAndMerge } from '../../utils.js';
+import type { UsecaseStyleOptions } from './types.js';
+
+const defaultUsecaseStyleOptions: UsecaseStyleOptions = {
+  sectionStrokeColor: 'black',
+  sectionStrokeWidth: '1',
+  sectionFillColor: '#efefef',
+  leafStrokeColor: 'black',
+  leafStrokeWidth: '1',
+  leafFillColor: '#efefef',
+  labelColor: 'black',
+  labelFontSize: '12px',
+  valueFontSize: '10px',
+  valueColor: 'black',
+  titleColor: 'black',
+  titleFontSize: '14px',
+};
+
+export const getStyles: DiagramStylesProvider = ({
+  usecase,
+}: { usecase?: UsecaseStyleOptions } = {}) => {
+  const options = cleanAndMerge(defaultUsecaseStyleOptions, usecase);
+
+  return `
+  .usecaseNode.section {
+    stroke: ${options.sectionStrokeColor};
+    stroke-width: ${options.sectionStrokeWidth};
+    fill: ${options.sectionFillColor};
+  }
+  .usecaseNode.leaf {
+    stroke: ${options.leafStrokeColor};
+    stroke-width: ${options.leafStrokeWidth};
+    fill: ${options.leafFillColor};
+  }
+  .usecaseLabel {
+    fill: ${options.labelColor};
+    font-size: ${options.labelFontSize};
+  }
+  .usecaseValue {
+    fill: ${options.valueColor};
+    font-size: ${options.valueFontSize};
+  }
+  .usecaseTitle {
+    fill: ${options.titleColor};
+    font-size: ${options.titleFontSize};
+  }
+  `;
+};
+
+export default getStyles;

packages/mermaid/src/diagrams/usecase/types.ts

@@ -0,0 +1,68 @@
+import type { DiagramDBBase, DiagramStyleClassDef } from '../../diagram-api/types.js';
+import type { BaseDiagramConfig } from '../../config.type.js';
+
+export interface UsecaseNode {
+  name: string;
+  children?: UsecaseNode[];
+  value?: number;
+  parent?: UsecaseNode;
+  classSelector?: string;
+  cssCompiledStyles?: string[];
+}
+
+export interface UsecaseDiagramDB extends DiagramDBBase<UsecaseDiagramConfig> {
+  getNodes: () => UsecaseNode[];
+  addNode: (node: UsecaseNode, level: number) => void;
+  getRoot: () => UsecaseNode | undefined;
+  getClasses: () => Map<string, DiagramStyleClassDef>;
+  addClass: (className: string, style: string) => void;
+  getStylesForClass: (classSelector: string) => string[];
+  // Update
+}
+
+export interface UsecaseStyleOptions {
+  sectionStrokeColor?: string;
+  sectionStrokeWidth?: string;
+  sectionFillColor?: string;
+  leafStrokeColor?: string;
+  leafStrokeWidth?: string;
+  leafFillColor?: string;
+  labelColor?: string;
+  labelFontSize?: string;
+  valueFontSize?: string;
+  valueColor?: string;
+  titleColor?: string;
+  titleFontSize?: string;
+}
+
+export interface UsecaseData {
+  nodes: UsecaseNode[];
+  levels: Map<UsecaseNode, number>;
+  root?: UsecaseNode;
+  outerNodes: UsecaseNode[];
+}
+
+export interface UsecaseItem {
+  $type: string;
+  name: string;
+  value?: number;
+  classSelector?: string;
+}
+
+export interface UsecaseAst {
+  title?: string;
+  description?: string;
+}
+
+// Define the UsecaseDiagramConfig interface
+export interface UsecaseDiagramConfig extends BaseDiagramConfig {
+  padding?: number;
+  diagramPadding?: number;
+  showValues?: boolean;
+  nodeWidth?: number;
+  nodeHeight?: number;
+  borderWidth?: number;
+  valueFontSize?: number;
+  labelFontSize?: number;
+  valueFormat?: string;
+}

packages/mermaid/src/docs/diagrams/flowchart-code-flow.mmd

@@ -0,0 +1,189 @@
+---
+references:
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDiagram.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDb.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDetector.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowDetector-v2.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowRenderer-v3-unified.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/styles.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/types.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/flowChartShapes.js"
+  - "File: /packages/mermaid/src/diagrams/flowchart/parser/flowParser.ts"
+  - "File: /packages/mermaid/src/diagrams/flowchart/elk/detector.ts"
+generationTime: 2025-07-23T10:31:53.266Z
+---
+flowchart TD
+    %% Entry Points and Detection
+    Input["User Input Text"] --> Detection{Detection Phase}
+    
+    Detection --> flowDetector["flowDetector.ts<br/>detector(txt, config)"]
+    Detection --> flowDetectorV2["flowDetector-v2.ts<br/>detector(txt, config)"]
+    Detection --> elkDetector["elk/detector.ts<br/>detector(txt, config)"]
+    
+    flowDetector --> |"Checks /^\s*graph/"| DetectLegacy{Legacy Flowchart?}
+    flowDetectorV2 --> |"Checks /^\s*flowchart/"| DetectNew{New Flowchart?}
+    elkDetector --> |"Checks /^\s*flowchart-elk/"| DetectElk{ELK Layout?}
+    
+    DetectLegacy --> |Yes| LoadDiagram
+    DetectNew --> |Yes| LoadDiagram
+    DetectElk --> |Yes| LoadDiagram
+    
+    %% Loading Phase
+    LoadDiagram["loader() function"] --> flowDiagram["flowDiagram.ts<br/>diagram object"]
+    
+    flowDiagram --> DiagramStructure{Diagram Components}
+    DiagramStructure --> Parser["parser: flowParser"]
+    DiagramStructure --> Database["db: new FlowDB()"]
+    DiagramStructure --> Renderer["renderer: flowRenderer-v3-unified"]
+    DiagramStructure --> Styles["styles: flowStyles"]
+    DiagramStructure --> Init["init: (cnf: MermaidConfig)"]
+    
+    %% Parser Phase
+    Parser --> flowParser["parser/flowParser.ts<br/>newParser.parse(src)"]
+    flowParser --> |"Preprocesses src"| RemoveWhitespace["Remove trailing whitespace<br/>src.replace(/}\s*\n/g, '}\n')"]
+    RemoveWhitespace --> flowJison["parser/flow.jison<br/>flowJisonParser.parse(newSrc)"]
+    
+    flowJison --> ParseGraph["Parse Graph Structure"]
+    ParseGraph --> ParseVertices["Parse Vertices"]
+    ParseGraph --> ParseEdges["Parse Edges"]
+    ParseGraph --> ParseSubgraphs["Parse Subgraphs"]
+    ParseGraph --> ParseClasses["Parse Classes"]
+    ParseGraph --> ParseStyles["Parse Styles"]
+    
+    %% Database Phase - FlowDB Class
+    Database --> FlowDBClass["flowDb.ts<br/>FlowDB class"]
+    
+    FlowDBClass --> DBInit["constructor()<br/>- Initialize counters<br/>- Bind methods<br/>- Setup toolTips<br/>- Call clear()"]
+    
+    DBInit --> DBMethods{FlowDB Methods}
+    
+    DBMethods --> addVertex["addVertex(id, textObj, type, style,<br/>classes, dir, props, metadata)"]
+    DBMethods --> addLink["addLink(_start[], _end[], linkData)"]
+    DBMethods --> addSingleLink["addSingleLink(_start, _end, type, id)"]
+    DBMethods --> setDirection["setDirection(dir)"]
+    DBMethods --> addSubGraph["addSubGraph(nodes[], id, title)"]
+    DBMethods --> addClass["addClass(id, style)"]
+    DBMethods --> setClass["setClass(ids, className)"]
+    DBMethods --> setTooltip["setTooltip(ids, tooltip)"]
+    DBMethods --> setClickEvent["setClickEvent(id, functionName, args)"]
+    DBMethods --> setClickFun["setClickFun(id, functionName, args)"]
+    
+    %% Vertex Processing
+    addVertex --> VertexProcess{Vertex Processing}
+    VertexProcess --> CreateVertex["Create FlowVertex object<br/>- id, labelType, domId<br/>- styles[], classes[]"]
+    VertexProcess --> SanitizeText["sanitizeText(textObj.text)"]
+    VertexProcess --> ParseMetadata["Parse YAML metadata<br/>yaml.load(yamlData)"]
+    VertexProcess --> SetVertexProps["Set vertex properties<br/>- shape, label, icon, form<br/>- pos, img, constraint, w, h"]
+    
+    %% Edge Processing  
+    addSingleLink --> EdgeProcess{Edge Processing}
+    EdgeProcess --> CreateEdge["Create FlowEdge object<br/>- start, end, type, text<br/>- labelType, classes[]"]
+    EdgeProcess --> ProcessLinkText["Process link text<br/>- sanitizeText()<br/>- strip quotes"]
+    EdgeProcess --> SetEdgeProps["Set edge properties<br/>- type, stroke, length"]
+    EdgeProcess --> GenerateEdgeId["Generate edge ID<br/>getEdgeId(start, end, counter)"]
+    EdgeProcess --> ValidateEdgeLimit["Validate edge limit<br/>maxEdges check"]
+    
+    %% Data Collection
+    DBMethods --> GetData["getData()"]
+    GetData --> CollectNodes["Collect nodes[] from vertices"]
+    GetData --> CollectEdges["Collect edges[] from edges"]
+    GetData --> ProcessSubGraphs["Process subgraphs<br/>- parentDB Map<br/>- subGraphDB Map"]
+    GetData --> AddNodeFromVertex["addNodeFromVertex()<br/>for each vertex"]
+    GetData --> ProcessEdgeTypes["destructEdgeType()<br/>arrowTypeStart, arrowTypeEnd"]
+    
+    %% Node Creation
+    AddNodeFromVertex --> NodeCreation{Node Creation}
+    NodeCreation --> FindExistingNode["findNode(nodes, vertex.id)"]
+    NodeCreation --> CreateBaseNode["Create base node<br/>- id, label, parentId<br/>- cssStyles, cssClasses<br/>- shape, domId, tooltip"]
+    NodeCreation --> GetCompiledStyles["getCompiledStyles(classDefs)"]
+    NodeCreation --> GetTypeFromVertex["getTypeFromVertex(vertex)"]
+    
+    %% Rendering Phase
+    Renderer --> flowRendererV3["flowRenderer-v3-unified.ts<br/>draw(text, id, version, diag)"]
+    
+    flowRendererV3 --> RenderInit["Initialize rendering<br/>- getConfig()<br/>- handle securityLevel<br/>- getDiagramElement()"]
+    
+    RenderInit --> GetLayoutData["diag.db.getData()<br/>as LayoutData"]
+    GetLayoutData --> SetupLayoutData["Setup layout data<br/>- type, layoutAlgorithm<br/>- direction, spacing<br/>- markers, diagramId"]
+    
+    SetupLayoutData --> CallRender["render(data4Layout, svg)"]
+    CallRender --> SetupViewPort["setupViewPortForSVG(svg, padding)"]
+    SetupViewPort --> ProcessLinks["Process vertex links<br/>- create anchor elements<br/>- handle click events"]
+    
+    %% Shape Rendering
+    CallRender --> ShapeSystem["flowChartShapes.js<br/>Shape Functions"]
+    
+    ShapeSystem --> ShapeFunctions{Shape Functions}
+    ShapeFunctions --> question["question(parent, bbox, node)"]
+    ShapeFunctions --> hexagon["hexagon(parent, bbox, node)"]
+    ShapeFunctions --> rect_left_inv_arrow["rect_left_inv_arrow(parent, bbox, node)"]
+    ShapeFunctions --> lean_right["lean_right(parent, bbox, node)"]
+    ShapeFunctions --> lean_left["lean_left(parent, bbox, node)"]
+    
+    ShapeFunctions --> insertPolygonShape["insertPolygonShape(parent, w, h, points)"]
+    ShapeFunctions --> intersectPolygon["intersectPolygon(node, points, point)"]
+    ShapeFunctions --> intersectRect["intersectRect(node, point)"]
+    
+    %% Styling System
+    Styles --> stylesTS["styles.ts<br/>getStyles(options)"]
+    stylesTS --> StyleOptions["FlowChartStyleOptions<br/>- arrowheadColor, border2<br/>- clusterBkg, mainBkg<br/>- fontFamily, textColor"]
+    
+    StyleOptions --> GenerateCSS["Generate CSS styles<br/>- .label, .cluster-label<br/>- .node, .edgePath<br/>- .flowchart-link, .edgeLabel"]
+    GenerateCSS --> GetIconStyles["getIconStyles()"]
+    
+    %% Type System
+    Parser --> TypeSystem["types.ts<br/>Type Definitions"]
+    TypeSystem --> FlowVertex["FlowVertex interface"]
+    TypeSystem --> FlowEdge["FlowEdge interface"]
+    TypeSystem --> FlowClass["FlowClass interface"]
+    TypeSystem --> FlowSubGraph["FlowSubGraph interface"]
+    TypeSystem --> FlowVertexTypeParam["FlowVertexTypeParam<br/>Shape types"]
+    
+    %% Utility Functions
+    DBMethods --> UtilityFunctions{Utility Functions}
+    UtilityFunctions --> lookUpDomId["lookUpDomId(id)"]
+    UtilityFunctions --> getClasses["getClasses()"]
+    UtilityFunctions --> getDirection["getDirection()"]
+    UtilityFunctions --> getVertices["getVertices()"]
+    UtilityFunctions --> getEdges["getEdges()"]
+    UtilityFunctions --> getSubGraphs["getSubGraphs()"]
+    UtilityFunctions --> clear["clear()"]
+    UtilityFunctions --> defaultConfig["defaultConfig()"]
+    
+    %% Event Handling
+    ProcessLinks --> EventHandling{Event Handling}
+    EventHandling --> setupToolTips["setupToolTips(element)"]
+    EventHandling --> bindFunctions["bindFunctions(element)"]
+    EventHandling --> runFunc["utils.runFunc(functionName, args)"]
+    
+    %% Common Database Functions
+    DBMethods --> CommonDB["commonDb.js functions"]
+    CommonDB --> setAccTitle["setAccTitle()"]
+    CommonDB --> getAccTitle["getAccTitle()"]
+    CommonDB --> setAccDescription["setAccDescription()"]
+    CommonDB --> getAccDescription["getAccDescription()"]
+    CommonDB --> setDiagramTitle["setDiagramTitle()"]
+    CommonDB --> getDiagramTitle["getDiagramTitle()"]
+    CommonDB --> commonClear["clear()"]
+    
+    %% Final Output
+    ProcessLinks --> FinalSVG["Final SVG Output"]
+    
+    %% Layout Algorithm Selection
+    SetupLayoutData --> LayoutAlgorithm{Layout Algorithm}
+    LayoutAlgorithm --> Dagre["dagre<br/>(default)"]
+    LayoutAlgorithm --> DagreWrapper["dagre-wrapper<br/>(v2 renderer)"]
+    LayoutAlgorithm --> ELK["elk<br/>(external package)"]
+    
+    %% Testing Components
+    FlowDBClass --> TestFiles["Test Files"]
+    TestFiles --> flowDbSpec["flowDb.spec.ts"]
+    TestFiles --> flowChartShapesSpec["flowChartShapes.spec.js"]
+    TestFiles --> ParserTests["parser/*.spec.js files<br/>- flow-text.spec.js<br/>- flow-edges.spec.js<br/>- flow-style.spec.js<br/>- subgraph.spec.js"]
+    
+    %% Configuration
+    Init --> ConfigSetup["Configuration Setup"]
+    ConfigSetup --> FlowchartConfig["cnf.flowchart config"]
+    ConfigSetup --> ArrowMarkers["arrowMarkerAbsolute"]
+    ConfigSetup --> LayoutConfig["layout config"]
+    ConfigSetup --> SetConfig["setConfig() calls"]

packages/mermaid/src/docs/diagrams/mermaid-api-sequence.mmd

@@ -0,0 +1,307 @@
+---
+references:
+  - "File: /packages/mermaid/src/mermaidAPI.ts"
+  - "File: /packages/mermaid/src/mermaid.ts"
+generationTime: 2025-01-28T16:30:00.000Z
+---
+sequenceDiagram
+    participant User as User/Browser
+    participant Mermaid as mermaid.ts
+    participant Queue as executionQueue
+    participant API as mermaidAPI.ts
+    participant Config as configApi
+    participant Preprocessor as preprocessDiagram
+    participant DiagramAPI as diagram-api
+    participant Diagram as Diagram.fromText
+    participant Renderer as diagram.renderer
+    participant Styles as Styling System
+    participant DOM as DOM/SVG
+
+    Note over User, DOM: Mermaid Complete API Flow
+
+    %% Initialization Phase
+    User->>+Mermaid: mermaid.initialize(config)
+    Mermaid->>+API: mermaidAPI.initialize(config)
+    
+    API->>API: assignWithDepth({}, userOptions)
+    API->>API: handle legacy fontFamily config
+    API->>Config: saveConfigFromInitialize(options)
+    
+    alt Theme Configuration Available
+        API->>API: check if theme in theme object
+        API->>API: set themeVariables from theme
+    else Default Theme
+        API->>API: use default theme variables
+    end
+    
+    API->>Config: setSiteConfig(options) or getSiteConfig()
+    API->>API: setLogLevel(config.logLevel)
+    API->>DiagramAPI: addDiagrams()
+    
+    API-->>-Mermaid: initialization complete
+    Mermaid-->>-User: ready to render
+
+    %% Content Loaded Event
+    User->>DOM: document.load event
+    DOM->>+Mermaid: contentLoaded()
+    
+    opt startOnLoad is true
+        Mermaid->>Config: getConfig()
+        Config-->>Mermaid: { startOnLoad: true }
+        Mermaid->>Mermaid: run()
+    end
+    
+    Mermaid-->>-DOM: event handling complete
+
+    %% Main Run Function
+    User->>+Mermaid: mermaid.run(options)
+    
+    Mermaid->>Mermaid: runThrowsErrors(options)
+    Mermaid->>Config: getConfig()
+    Config-->>Mermaid: configuration object
+    
+    alt nodes provided
+        Mermaid->>Mermaid: use provided nodes
+    else querySelector provided
+        Mermaid->>DOM: document.querySelectorAll(querySelector)
+        DOM-->>Mermaid: nodesToProcess
+    end
+    
+    Mermaid->>Mermaid: new InitIDGenerator(deterministicIds, seed)
+    
+    loop For each diagram element
+        Mermaid->>DOM: check element.getAttribute('data-processed')
+        
+        opt not processed
+            Mermaid->>DOM: element.setAttribute('data-processed', 'true')
+            Mermaid->>Mermaid: generate unique id
+            Mermaid->>DOM: get element.innerHTML
+            Mermaid->>Mermaid: entityDecode and clean text
+            Mermaid->>Mermaid: detectInit(txt)
+            
+            Mermaid->>Queue: render(id, txt, element)
+        end
+    end
+    
+    Mermaid-->>-User: processing initiated
+
+    %% Render Function (Queued)
+    activate Queue
+    Queue->>+API: mermaidAPI.render(id, text, container)
+    
+    API->>DiagramAPI: addDiagrams()
+    API->>+Preprocessor: processAndSetConfigs(text)
+    
+    Preprocessor->>Preprocessor: preprocessDiagram(text)
+    Preprocessor->>Config: reset()
+    Preprocessor->>Config: addDirective(processed.config)
+    Preprocessor-->>-API: { code, config }
+    
+    API->>Config: getConfig()
+    Config-->>API: current configuration
+    
+    opt text length > maxTextSize
+        API->>API: text = MAX_TEXTLENGTH_EXCEEDED_MSG
+    end
+    
+    API->>API: setup id selectors and element IDs
+    API->>API: determine security level (sandbox/loose)
+
+    %% DOM Setup
+    alt svgContainingElement provided
+        alt isSandboxed
+            API->>DOM: sandboxedIframe(select(svgContainingElement), iFrameID)
+            API->>DOM: select iframe contentDocument body
+        else
+            API->>DOM: select(svgContainingElement)
+        end
+    else no container
+        API->>API: removeExistingElements(document, id, divId, iFrameId)
+        alt isSandboxed
+            API->>DOM: sandboxedIframe(select('body'), iFrameID)
+        else
+            API->>DOM: select('body')
+        end
+    end
+    
+    API->>DOM: appendDivSvgG(root, id, enclosingDivID, fontFamily, XMLNS_XLINK_STD)
+
+    %% Diagram Creation
+    API->>+Diagram: Diagram.fromText(text, { title: processed.title })
+    
+    Diagram->>DiagramAPI: detect diagram type
+    Diagram->>DiagramAPI: load appropriate diagram
+    Diagram-->>-API: diagram instance
+    
+    opt parsing error occurred
+        API->>+Diagram: Diagram.fromText('error')
+        Diagram-->>-API: error diagram
+        API->>API: store parseEncounteredException
+    end
+
+    %% Style Generation
+    API->>DOM: get svg element and firstChild
+    API->>Renderer: diag.renderer.getClasses(text, diag)
+    Renderer-->>API: diagramClassDefs
+    
+    API->>+Styles: createUserStyles(config, diagramType, diagramClassDefs, idSelector)
+    
+    Styles->>Styles: createCssStyles(config, classDefs)
+    
+    opt config.themeCSS defined
+        Styles->>Styles: append themeCSS
+    end
+    
+    opt fontFamily configured
+        Styles->>Styles: add CSS variables for fonts
+    end
+    
+    opt classDefs exist
+        loop For each styleClassDef
+            opt has styles
+                Styles->>Styles: cssImportantStyles for each CSS element
+            end
+            opt has textStyles
+                Styles->>Styles: cssImportantStyles for tspan elements
+            end
+        end
+    end
+    
+    Styles->>Styles: getStyles(graphType, userCSSstyles, themeVariables)
+    Styles->>Styles: serialize(compile(svgId{allStyles}), stringify)
+    Styles-->>-API: compiled CSS rules
+    
+    API->>DOM: create style element
+    API->>DOM: style.innerHTML = rules
+    API->>DOM: svg.insertBefore(style, firstChild)
+
+    %% Diagram Rendering
+    API->>+Renderer: diag.renderer.draw(text, id, version, diag)
+    
+    Renderer->>Renderer: diagram-specific rendering logic
+    Renderer->>DOM: create SVG elements
+    Renderer->>DOM: apply positioning and styling
+    Renderer-->>-API: rendered diagram
+    
+    opt rendering error
+        alt suppressErrorRendering
+            API->>API: removeTempElements()
+            API->>Mermaid: throw error
+        else
+            API->>Renderer: errorRenderer.draw(text, id, version)
+        end
+    end
+
+    %% Accessibility and Cleanup
+    API->>DOM: select svg element
+    API->>Diagram: diag.db.getAccTitle()
+    API->>Diagram: diag.db.getAccDescription()
+    API->>API: addA11yInfo(diagramType, svgNode, a11yTitle, a11yDescr)
+    
+    API->>DOM: set xmlns for foreignobject elements
+    API->>DOM: get innerHTML from enclosing div
+    
+    API->>+API: cleanUpSvgCode(svgCode, isSandboxed, arrowMarkerAbsolute)
+    
+    opt not useArrowMarkerUrls and not sandboxed
+        API->>API: replace marker-end URLs with anchors
+    end
+    
+    API->>API: decodeEntities(svgCode)
+    API->>API: replace <br> with <br/>
+    API-->>-API: cleaned SVG code
+    
+    alt isSandboxed
+        API->>+API: putIntoIFrame(svgCode, svgEl)
+        API->>API: calculate iframe height
+        API->>API: toBase64 encode SVG content
+        API->>API: create iframe with sandbox attributes
+        API-->>-API: iframe HTML
+    else not loose security
+        API->>API: DOMPurify.sanitize(svgCode, options)
+    end
+    
+    API->>API: attachFunctions()
+    API->>API: removeTempElements()
+    
+    opt parseEncounteredException
+        API->>Mermaid: throw parseEncounteredException
+    end
+    
+    API-->>-Queue: { diagramType, svg: svgCode, bindFunctions }
+
+    %% Return to Web Integration
+    activate Mermaid
+    Queue-->>Mermaid: render result
+    Mermaid->>DOM: element.innerHTML = svg
+    
+    opt postRenderCallback
+        Mermaid->>User: postRenderCallback(id)
+    end
+    
+    opt bindFunctions exist
+        Mermaid->>DOM: bindFunctions(element)
+    end
+    deactivate Mermaid
+
+    %% Parse Function Flow
+    User->>+Mermaid: mermaid.parse(text, parseOptions)
+    activate Queue
+    
+    Queue->>+API: mermaidAPI.parse(text, parseOptions)
+    
+    API->>DiagramAPI: addDiagrams()
+    API->>Preprocessor: processAndSetConfigs(text)
+    Preprocessor-->>API: { code, config }
+    API->>Diagram: getDiagramFromText(code)
+    Diagram-->>API: diagram instance
+    API-->>-Queue: { diagramType: diagram.type, config }
+    
+    Queue-->>-Mermaid: parse result
+    Mermaid-->>-User: ParseResult or false
+
+    %% External Diagram Registration
+    User->>+Mermaid: registerExternalDiagrams(diagrams, options)
+    
+    Mermaid->>DiagramAPI: addDiagrams()
+    Mermaid->>DiagramAPI: registerLazyLoadedDiagrams(...diagrams)
+    
+    opt lazyLoad is false
+        Mermaid->>DiagramAPI: loadRegisteredDiagrams()
+    end
+    
+    Mermaid-->>-User: registration complete
+
+    %% Error Handling
+    Note over Mermaid, API: Error Handling Throughout
+    alt Error occurs
+        API->>Mermaid: throw error
+        Mermaid->>+Mermaid: handleError(error, errors, parseError)
+        
+        Mermaid->>Mermaid: log.warn(error)
+        
+        alt isDetailedError
+            Mermaid->>User: parseError(error.str, error.hash)
+        else
+            Mermaid->>User: parseError(error)
+        end
+        
+        opt not suppressErrors
+            Mermaid->>User: throw error
+        end
+        
+        Mermaid-->>-User: error handled
+    end
+
+    %% Configuration Details
+    Note over Config: Configuration Functions
+    Note right of Config: Functions:<br/>- reset()<br/>- getConfig()<br/>- setConfig()<br/>- getSiteConfig()<br/>- updateSiteConfig()<br/>- saveConfigFromInitialize()
+    
+    Note over Styles: CSS Generation
+    Note right of Styles: Features:<br/>- createCssStyles()<br/>- createUserStyles()<br/>- cssImportantStyles()<br/>- Theme integration<br/>- Class definitions
+    
+    Note over API: Security Levels
+    Note right of API: Modes:<br/>- sandbox: iframe isolation<br/>- loose: minimal sanitization<br/>- default: DOMPurify sanitization
+    
+    Note over API: Helper Functions
+    Note right of API: Utilities:<br/>- cleanUpSvgCode()<br/>- putIntoIFrame()<br/>- appendDivSvgG()<br/>- removeExistingElements() 

packages/mermaid/src/docs/diagrams/mindmap-implementation-sequence.mmd

@@ -0,0 +1,180 @@
+---
+references:
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmap-definition.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmapDb.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/detector.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmapTypes.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/mindmapRenderer.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/styles.ts"
+  - "File: /packages/mermaid/src/diagrams/mindmap/svgDraw.ts"
+generationTime: 2025-01-28T16:00:00.000Z
+---
+sequenceDiagram
+    participant User as User Input Text
+    participant Detector as detector.ts
+    participant Loader as DiagramLoader
+    participant Definition as mindmap-definition.ts
+    participant Parser as parser/mindmap.jison
+    participant DB as MindmapDB
+    participant Renderer as mindmapRenderer.ts
+    participant Cytoscape as cytoscape.js
+    participant SVGDraw as svgDraw.ts
+    participant Styles as styles.ts
+    participant Output as Final SVG
+
+    Note over User, Output: Mindmap Implementation Flow
+
+    %% Detection Phase
+    User->>Detector: /^\s*mindmap/ text input
+    activate Detector
+    Detector->>Detector: detector(txt) validates pattern
+    Detector->>Loader: loader() function called
+    deactivate Detector
+    
+    activate Loader
+    Loader->>Definition: import mindmap-definition.js
+    deactivate Loader
+
+    %% Core Structure Setup
+    activate Definition
+    Definition->>DB: get db() → new MindmapDB()
+    Definition->>Renderer: setup renderer
+    Definition->>Parser: setup parser
+    Definition->>Styles: setup styles
+    deactivate Definition
+
+    %% Database Initialization
+    activate DB
+    Note over DB: MindmapDB Constructor
+    DB->>DB: initialize nodes array
+    DB->>DB: setup nodeType constants
+    DB->>DB: bind methods
+    DB->>DB: clear() state
+    
+    %% Parsing Phase
+    activate Parser
+    User->>Parser: mindmap syntax text
+    
+    loop For each node in hierarchy
+        Parser->>DB: addNode(level, id, descr, type)
+        activate DB
+        DB->>DB: sanitizeText(id, descr)
+        DB->>DB: getType(startStr, endStr)
+        Note right of DB: Shape Detection:<br/>[ → RECT<br/>( → ROUNDED_RECT<br/>(( → CIRCLE<br/>)) → BANG<br/>{{ → HEXAGON
+        DB->>DB: getParent(level)
+        DB->>DB: create MindmapNode
+        DB->>DB: add to hierarchy
+        deactivate DB
+    end
+
+    opt Icon/Class Decoration
+        Parser->>DB: decorateNode(decoration)
+        DB->>DB: set icon/class properties
+    end
+    deactivate Parser
+
+    %% Data Preparation
+    Renderer->>DB: getData() for layout
+    activate DB
+    DB->>DB: collect all nodes
+    DB->>DB: build parent-child relationships
+    DB-->>Renderer: return node hierarchy
+    deactivate DB
+
+    %% Rendering Pipeline
+    activate Renderer
+    Note over Renderer: Rendering Phase
+    
+    Renderer->>Cytoscape: initialize cytoscape
+    activate Cytoscape
+    
+    loop For each node in mindmap
+        Renderer->>Cytoscape: addNodes(mindmap, cy, conf, level)
+        Cytoscape->>Cytoscape: create node data
+        Cytoscape->>Cytoscape: set position (x, y)
+    end
+
+    loop For parent-child relationships
+        Renderer->>Cytoscape: add edges
+        Cytoscape->>Cytoscape: create edge data
+    end
+
+    Renderer->>Cytoscape: configure cose-bilkent layout
+    Cytoscape->>Cytoscape: calculate optimal positions
+    Cytoscape-->>Renderer: return positioned graph
+    deactivate Cytoscape
+
+    %% SVG Generation
+    Renderer->>SVGDraw: drawNodes(db, svg, mindmap, section, conf)
+    activate SVGDraw
+    
+    loop For each node recursively
+        SVGDraw->>SVGDraw: select shape function
+        
+        alt Default Shape
+            SVGDraw->>SVGDraw: defaultBkg() - rounded rectangle
+        else Rectangle Shape
+            SVGDraw->>SVGDraw: rectBkg() - sharp corners
+        else Circle Shape
+            SVGDraw->>SVGDraw: circleBkg() - perfect circle
+        else Cloud Shape
+            SVGDraw->>SVGDraw: cloudBkg() - organic curves
+        else Bang Shape
+            SVGDraw->>SVGDraw: bangBkg() - explosion style
+        else Hexagon Shape
+            SVGDraw->>SVGDraw: hexagonBkg() - six sides
+        end
+        
+        SVGDraw->>SVGDraw: create SVG elements
+        SVGDraw->>SVGDraw: add text labels
+        SVGDraw->>SVGDraw: position node
+        
+        opt Node has children
+            SVGDraw->>SVGDraw: drawNodes() recursive call
+        end
+    end
+    deactivate SVGDraw
+
+    %% Edge Rendering
+    Renderer->>Renderer: drawEdges(edgesEl, cy)
+    loop For each edge
+        Renderer->>Renderer: extract edge bounds
+        Renderer->>Renderer: draw SVG path
+    end
+
+    %% Styling Application
+    Renderer->>Styles: getStyles(options)
+    activate Styles
+    
+    Styles->>Styles: genSections(options)
+    loop For THEME_COLOR_LIMIT sections
+        Styles->>Styles: generate color scale
+        Styles->>Styles: create CSS rules
+        Note right of Styles: .section-X fills<br/>.edge-depth-X widths<br/>.node-icon-X colors
+    end
+    
+    Styles->>Styles: apply theme integration
+    Styles-->>Renderer: return compiled CSS
+    deactivate Styles
+
+    %% Final Assembly
+    Renderer->>Output: selectSvgElement()
+    Renderer->>Output: setupGraphViewbox()
+    Renderer->>Output: apply styles
+    Renderer->>Output: add interactive elements
+    deactivate Renderer
+
+    activate Output
+    Note over Output: Final Mindmap Features
+    Output->>Output: responsive layout
+    Output->>Output: accessibility attributes
+    Output->>Output: hover effects
+    Output->>Output: click handling
+    Output-->>User: rendered mindmap
+    deactivate Output
+
+    %% Configuration Details
+    Note over DB, Styles: Configuration Options
+    Note right of DB: Padding Calculations:<br/>Base padding from config<br/>RECT: ×2 padding<br/>ROUNDED_RECT: ×2 padding<br/>HEXAGON: ×2 padding
+    Note right of Styles: Section Management:<br/>MAX_SECTIONS = 12<br/>Dynamic color generation<br/>Git theme integration
+    Note right of Renderer: Layout Parameters:<br/>Cytoscape configuration<br/>coseBilkent settings<br/>Node spacing rules 

packages/mermaid/src/docs/ecosystem/integrations-community.md

@@ -79,6 +79,7 @@ To add an integration to this list, see the [Integrations - create page](./integ
 LLM integrations to create mermaid diagrams using AI from text descriptions.
 
 - [HueHive - Create mermaid diagrams with text](https://huehive.co/tools/diagrams)
+- [MCP Server Mermaid](https://github.com/hustcc/mcp-mermaid) - Generate mermaid diagram and chart with AI MCP dynamically.
 
 ### CRM/ERP
 
@@ -98,6 +99,7 @@ Blogging frameworks and platforms
   - [Mermaid](https://nextra.site/docs/guide/mermaid)
 - [WordPress](https://wordpress.org)
   - [MerPRess](https://wordpress.org/plugins/merpress/)
+  - [WP Documentation](https://wordpress.org/themes/wp-documentation/)
 
 ### CMS/ECM
 

packages/mermaid/src/docs/ecosystem/integrations-create.md

@@ -10,9 +10,7 @@ Applications that support Mermaid files [SHOULD](https://datatracker.ietf.org/do
 
 ### MIME Type
 
-The recommended [MIME type](https://www.iana.org/assignments/media-types/media-types.xhtml) for Mermaid media is `text/vnd.mermaid`.
-
-Currently pending [IANA](https://www.iana.org/) recognition.
+The recommended [MIME type](https://www.iana.org/assignments/media-types/media-types.xhtml) for Mermaid media is [`text/vnd.mermaid`](https://www.iana.org/assignments/media-types/application/vnd.mermaid).
 
 ## Showcase
 

packages/mermaid/src/docs/syntax/flowchart.md

@@ -1135,15 +1135,46 @@ It is possible to style the type of curve used for lines between items, if the d
 Available curve styles include `basis`, `bumpX`, `bumpY`, `cardinal`, `catmullRom`, `linear`, `monotoneX`, `monotoneY`,
 `natural`, `step`, `stepAfter`, and `stepBefore`.
 
+For a full list of available curves, including an explanation of custom curves, refer to
+the [Shapes](https://d3js.org/d3-shape/curve) documentation in the [d3-shape](https://github.com/d3/d3-shape/) project.
+
+Line styling can be achieved in two ways:
+
+1. Change the curve style of all the lines
+2. Change the curve style of a particular line
+
+#### Diagram level curve style
+
 In this example, a left-to-right graph uses the `stepBefore` curve style:
 
 ```
-%%{ init: { 'flowchart': { 'curve': 'stepBefore' } } }%%
+---
+config:
+  flowchart:
+    curve: stepBefore
+---
 graph LR
 ```
 
-For a full list of available curves, including an explanation of custom curves, refer to
-the [Shapes](https://d3js.org/d3-shape/curve) documentation in the [d3-shape](https://github.com/d3/d3-shape/) project.
+#### Edge level curve style using Edge IDs (v<MERMAID_RELEASE_VERSION>+)
+
+You can assign IDs to [edges](#attaching-an-id-to-edges). After assigning an ID you can modify the line style by modifying the edge's `curve` property using the following syntax:
+
+```mermaid
+flowchart LR
+    A e1@==> B
+    A e2@--> C
+    e1@{ curve: linear }
+    e2@{ curve: natural }
+```
+
+```info
+Any edge curve style modified at the edge level overrides the diagram level style.
+```
+
+```info
+If the same edge is modified multiple times the last modification will be rendered.
+```
 
 ### Styling a node
 

packages/mermaid/src/rendering-util/rendering-elements/shapes/requirementBox.ts

@@ -54,7 +54,7 @@ export async function requirementBox<T extends SVGGraphicsElement>(
   if (isRequirementNode) {
     const idHeight = await addText(
       shapeSvg,
-      `${requirementNode.requirementId ? `id: ${requirementNode.requirementId}` : ''}`,
+      `${requirementNode.requirementId ? `ID: ${requirementNode.requirementId}` : ''}`,
       accumulativeHeight,
       node.labelStyle
     );

packages/mermaid/src/types.ts

@@ -16,6 +16,19 @@ export interface NodeMetaData {
 export interface EdgeMetaData {
   animation?: 'fast' | 'slow';
   animate?: boolean;
+  curve?:
+    | 'basis'
+    | 'bumpX'
+    | 'bumpY'
+    | 'cardinal'
+    | 'catmullRom'
+    | 'linear'
+    | 'monotoneX'
+    | 'monotoneY'
+    | 'natural'
+    | 'step'
+    | 'stepAfter'
+    | 'stepBefore';
 }
 import type { MermaidConfig } from './config.type.js';
 

packages/parser/langium-config.json

@@ -35,6 +35,11 @@
       "id": "treemap",
       "grammar": "src/language/treemap/treemap.langium",
       "fileExtensions": [".mmd", ".mermaid"]
+    },
+    {
+      "id": "usecase",
+      "grammar": "src/language/usecase/usecase.langium",
+      "fileExtensions": [".mmd", ".mermaid"]
     }
   ],
   "mode": "production",

packages/parser/src/language/index.ts

@@ -9,6 +9,7 @@ export {
   GitGraph,
   Radar,
   Treemap,
+  Usecase,
   Branch,
   Commit,
   Merge,
@@ -24,6 +25,7 @@ export {
   isBranch,
   isCommit,
   isMerge,
+  isUsecase,
 } from './generated/ast.js';
 
 export {
@@ -35,6 +37,7 @@ export {
   GitGraphGeneratedModule,
   RadarGeneratedModule,
   TreemapGeneratedModule,
+  UsecaseGeneratedModule,
 } from './generated/module.js';
 
 export * from './gitGraph/index.js';
@@ -45,3 +48,4 @@ export * from './pie/index.js';
 export * from './architecture/index.js';
 export * from './radar/index.js';
 export * from './treemap/index.js';
+export * from './usecase/index.js';

packages/parser/src/language/usecase/index.ts

@@ -0,0 +1 @@
+export * from './module.js';

packages/parser/src/language/usecase/module.ts

@@ -0,0 +1,35 @@
+import { type DefaultSharedCoreModuleContext, type LangiumCoreServices } from 'langium';
+import type { Module, PartialLangiumCoreServices } from 'langium';
+import { EmptyFileSystem } from 'langium';
+import { UsecaseTokenBuilder } from './tokenBuilder.js';
+import { UsecaseValueConverter } from './valueConverter.js';
+import { UsecaseValidator } from './usecase-validator.js';
+
+interface UsecaseAddedServices {
+  parser: {
+    TokenBuilder: UsecaseTokenBuilder;
+    ValueConverter: UsecaseValueConverter;
+  };
+  validation: {
+    UsecaseValidator: UsecaseValidator;
+  };
+}
+
+export type UsecaseServices = LangiumCoreServices & UsecaseAddedServices;
+
+export const UsecaseModule: Module<
+  UsecaseServices,
+  PartialLangiumCoreServices & UsecaseAddedServices
+> = {
+  parser: {
+    TokenBuilder: () => new UsecaseTokenBuilder(),
+    ValueConverter: () => new UsecaseValueConverter(),
+  },
+  validation: {
+    UsecaseValidator: () => new UsecaseValidator(),
+  },
+};
+
+export function createUsecaseServices(_context: DefaultSharedCoreModuleContext = EmptyFileSystem) {
+  // TODO
+}

packages/parser/src/language/usecase/tokenBuilder.ts

@@ -0,0 +1,7 @@
+import { AbstractMermaidTokenBuilder } from '../common/index.js';
+
+export class UsecaseTokenBuilder extends AbstractMermaidTokenBuilder {
+  public constructor() {
+    super(['usecase']);
+  }
+}

packages/parser/src/language/usecase/usecase-validator.ts

@@ -0,0 +1,12 @@
+import type { UsecaseServices } from './module.js';
+/**
+ * Register custom validation checks.
+ */
+export function registerValidationChecks(_services: UsecaseServices) {
+  // TODO
+}
+
+/**
+ * Implementation of custom validations.
+ */
+export class UsecaseValidator {}

packages/parser/src/language/usecase/usecase.langium

@@ -0,0 +1 @@
+// TODO

packages/parser/src/language/usecase/valueConverter.ts

@@ -0,0 +1,12 @@
+import type { CstNode, GrammarAST, ValueType } from 'langium';
+import { AbstractMermaidValueConverter } from '../common/index.js';
+
+export class UsecaseValueConverter extends AbstractMermaidValueConverter {
+  protected runCustomConverter(
+    _rule: GrammarAST.AbstractRule,
+    _input: string,
+    _cstNode: CstNode
+  ): ValueType | undefined {
+    return undefined;
+  }
+}

packages/parser/src/parse.ts

@@ -1,6 +1,15 @@
 import type { LangiumParser, ParseResult } from 'langium';
 
-import type { Info, Packet, Pie, Architecture, GitGraph, Radar, Treemap } from './index.js';
+import type {
+  Info,
+  Packet,
+  Pie,
+  Architecture,
+  GitGraph,
+  Radar,
+  Treemap,
+  // Usecase,
+} from './index.js';
 
 export type DiagramAST = Info | Packet | Pie | Architecture | GitGraph | Radar;
 
@@ -41,6 +50,11 @@ const initializers = {
     const parser = createTreemapServices().Treemap.parser.LangiumParser;
     parsers.treemap = parser;
   },
+  // usecase: async () => {
+  //   const { createUsecaseServices } = await import('./language/usecase/index.js');
+  //   const parser = createUsecaseServices().Usecase.parser.LangiumParser;
+  //   parsers.usecase = parser;
+  // },
 } as const;
 
 export async function parse(diagramType: 'info', text: string): Promise<Info>;
@@ -50,6 +64,7 @@ export async function parse(diagramType: 'architecture', text: string): Promise<
 export async function parse(diagramType: 'gitGraph', text: string): Promise<GitGraph>;
 export async function parse(diagramType: 'radar', text: string): Promise<Radar>;
 export async function parse(diagramType: 'treemap', text: string): Promise<Treemap>;
+// export async function parse(diagramType: 'usecase', text: string): Promise<Usecase>;
 
 export async function parse<T extends DiagramAST>(
   diagramType: keyof typeof initializers,