chore: Overload parse type to be more specific.

Co-authored-by: Alois Klink <alois@aloisklink.com>

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

@@ -0,0 +1,21 @@
+> **Warning**
+>
+> ## THIS IS AN AUTOGENERATED FILE. DO NOT EDIT.
+>
+> ## Please edit the corresponding file in [/packages/mermaid/src/docs/config/setup/interfaces/mermaidAPI.ParseResult.md](../../../../packages/mermaid/src/docs/config/setup/interfaces/mermaidAPI.ParseResult.md).
+
+# Interface: ParseResult
+
+[mermaidAPI](../modules/mermaidAPI.md).ParseResult
+
+## Properties
+
+### diagramType
+
+• **diagramType**: `string`
+
+The diagram type, e.g. 'flowchart', 'sequence', etc.
+
+#### Defined in
+
+[mermaidAPI.ts:67](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L67)

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

@@ -39,7 +39,7 @@ bindFunctions?.(div); // To call bindFunctions only if it's present.
 
 #### Defined in
 
-[mermaidAPI.ts:93](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L93)
+[mermaidAPI.ts:90](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L90)
 
 ---
 
@@ -51,7 +51,7 @@ The diagram type, e.g. 'flowchart', 'sequence', etc.
 
 #### Defined in
 
-[mermaidAPI.ts:83](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L83)
+[mermaidAPI.ts:80](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L80)
 
 ---
 
@@ -63,4 +63,4 @@ The svg code for the rendered graph.
 
 #### Defined in
 
-[mermaidAPI.ts:79](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L79)
+[mermaidAPI.ts:76](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L76)

docs/config/setup/modules/mermaidAPI.md

@@ -9,6 +9,7 @@
 ## Interfaces
 
 - [ParseOptions](../interfaces/mermaidAPI.ParseOptions.md)
+- [ParseResult](../interfaces/mermaidAPI.ParseResult.md)
 - [RenderResult](../interfaces/mermaidAPI.RenderResult.md)
 
 ## References
@@ -25,23 +26,13 @@ Renames and re-exports [mermaidAPI](mermaidAPI.md#mermaidapi)
 
 #### Defined in
 
-[mermaidAPI.ts:73](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L73)
-
----
-
-### ParseResult
-
-Ƭ **ParseResult**: { `diagramType`: `string` } | `false`
-
-#### Defined in
-
-[mermaidAPI.ts:63](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L63)
+[mermaidAPI.ts:70](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L70)
 
 ## Variables
 
 ### mermaidAPI
 
-• `Const` **mermaidAPI**: `Readonly`<{ `defaultConfig`: `MermaidConfig` = configApi.defaultConfig; `getConfig`: () => `MermaidConfig` = configApi.getConfig; `getDiagramFromText`: (`text`: `string`, `metadata`: `Pick`<`DiagramMetadata`, `"title"`>) => `Promise`<`Diagram`> ; `getSiteConfig`: () => `MermaidConfig` = configApi.getSiteConfig; `globalReset`: () => `void` ; `initialize`: (`options`: `MermaidConfig`) => `void` ; `parse`: (`text`: `string`, `parseOptions?`: [`ParseOptions`](../interfaces/mermaidAPI.ParseOptions.md)) => `Promise`<[`ParseResult`](mermaidAPI.md#parseresult)> ; `render`: (`id`: `string`, `text`: `string`, `svgContainingElement?`: `Element`) => `Promise`<[`RenderResult`](../interfaces/mermaidAPI.RenderResult.md)> ; `reset`: () => `void` ; `setConfig`: (`conf`: `MermaidConfig`) => `MermaidConfig` = configApi.setConfig; `updateSiteConfig`: (`conf`: `MermaidConfig`) => `MermaidConfig` = configApi.updateSiteConfig }>
+• `Const` **mermaidAPI**: `Readonly`<{ `defaultConfig`: `MermaidConfig` = configApi.defaultConfig; `getConfig`: () => `MermaidConfig` = configApi.getConfig; `getDiagramFromText`: (`text`: `string`, `metadata`: `Pick`<`DiagramMetadata`, `"title"`>) => `Promise`<`Diagram`> ; `getSiteConfig`: () => `MermaidConfig` = configApi.getSiteConfig; `globalReset`: () => `void` ; `initialize`: (`options`: `MermaidConfig`) => `void` ; `parse`: (`text`: `string`, `parseOptions`: [`ParseOptions`](../interfaces/mermaidAPI.ParseOptions.md) & { `suppressErrors`: `true` }) => `Promise`<[`ParseResult`](../interfaces/mermaidAPI.ParseResult.md) | `false`>(`text`: `string`, `parseOptions?`: [`ParseOptions`](../interfaces/mermaidAPI.ParseOptions.md)) => `Promise`<[`ParseResult`](../interfaces/mermaidAPI.ParseResult.md)> ; `render`: (`id`: `string`, `text`: `string`, `svgContainingElement?`: `Element`) => `Promise`<[`RenderResult`](../interfaces/mermaidAPI.RenderResult.md)> ; `reset`: () => `void` ; `setConfig`: (`conf`: `MermaidConfig`) => `MermaidConfig` = configApi.setConfig; `updateSiteConfig`: (`conf`: `MermaidConfig`) => `MermaidConfig` = configApi.updateSiteConfig }>
 
 ## mermaidAPI configuration defaults
 
@@ -106,7 +97,7 @@ mermaid.initialize(config);
 
 #### Defined in
 
-[mermaidAPI.ts:618](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L618)
+[mermaidAPI.ts:620](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L620)
 
 ## Functions
 
@@ -137,7 +128,7 @@ Return the last node appended
 
 #### Defined in
 
-[mermaidAPI.ts:272](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L272)
+[mermaidAPI.ts:274](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L274)
 
 ---
 
@@ -163,7 +154,7 @@ the cleaned up svgCode
 
 #### Defined in
 
-[mermaidAPI.ts:218](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L218)
+[mermaidAPI.ts:220](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L220)
 
 ---
 
@@ -188,7 +179,7 @@ the string with all the user styles
 
 #### Defined in
 
-[mermaidAPI.ts:148](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L148)
+[mermaidAPI.ts:150](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L150)
 
 ---
 
@@ -211,7 +202,7 @@ the string with all the user styles
 
 #### Defined in
 
-[mermaidAPI.ts:195](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L195)
+[mermaidAPI.ts:197](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L197)
 
 ---
 
@@ -238,7 +229,7 @@ with an enclosing block that has each of the cssClasses followed by !important;
 
 #### Defined in
 
-[mermaidAPI.ts:133](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L133)
+[mermaidAPI.ts:135](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L135)
 
 ---
 
@@ -264,7 +255,7 @@ Put the svgCode into an iFrame. Return the iFrame code
 
 #### Defined in
 
-[mermaidAPI.ts:249](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L249)
+[mermaidAPI.ts:251](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L251)
 
 ---
 
@@ -289,4 +280,4 @@ Remove any existing elements from the given document
 
 #### Defined in
 
-[mermaidAPI.ts:322](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L322)
+[mermaidAPI.ts:324](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/mermaidAPI.ts#L324)

packages/mermaid/src/mermaid.ts

@@ -318,7 +318,7 @@ const executeQueue = async () => {
  * @returns An object with the diagramType set to type of the diagram if valid. Otherwise false if parseOptions.suppressErrors is true.
  * @throws Error if the diagram is invalid and parseOptions.suppressErrors is false or not set.
  */
-const parse = async (text: string, parseOptions?: ParseOptions): Promise<ParseResult | void> => {
+const parse: typeof mermaidAPI.parse = async (text, parseOptions) => {
   return new Promise((resolve, reject) => {
     // This promise will resolve when the render call is done.
     // It will be queued first and will be executed when it is first in line
@@ -367,7 +367,7 @@ const parse = async (text: string, parseOptions?: ParseOptions): Promise<ParseRe
  *   element will be removed when rendering is completed.
  * @returns Returns the SVG Definition and BindFunctions.
  */
-const render = (id: string, text: string, container?: Element): Promise<RenderResult> => {
+const render: typeof mermaidAPI.render = (id, text, container) => {
   return new Promise((resolve, reject) => {
     // This promise will resolve when the mermaidAPI.render call is done.
     // It will be queued first and will be executed when it is first in line

packages/mermaid/src/mermaidAPI.ts

@@ -60,15 +60,12 @@ export interface ParseOptions {
   suppressErrors?: boolean;
 }
 
-export type ParseResult =
-  | {
-      /**
-       * The diagram type, e.g. 'flowchart', 'sequence', etc.
-       */
-      diagramType: string;
-    }
-  | false;
-
+export interface ParseResult {
+  /**
+   * The diagram type, e.g. 'flowchart', 'sequence', etc.
+   */
+  diagramType: string;
+}
 // This makes it clear that we're working with a d3 selected element of some kind, even though it's hard to specify the exact type.
 export type D3Element = any;
 
@@ -108,7 +105,12 @@ function processAndSetConfigs(text: string) {
  * @throws Error if the diagram is invalid and parseOptions.suppressErrors is false or not set.
  */
 
-async function parse(text: string, parseOptions?: ParseOptions): Promise<ParseResult> {
+async function parse(
+  text: string,
+  parseOptions: ParseOptions & { suppressErrors: true }
+): Promise<ParseResult | false>;
+async function parse(text: string, parseOptions?: ParseOptions): Promise<ParseResult>;
+async function parse(text: string, parseOptions?: ParseOptions): Promise<ParseResult | false> {
   addDiagrams();
   try {
     const { code } = processAndSetConfigs(text);