diff --git a/packages/mermaid/src/diagrams/c4/c4Detector.ts b/packages/mermaid/src/diagrams/c4/c4Detector.ts
index d8f6c6adc..2e32496b2 100644
--- a/packages/mermaid/src/diagrams/c4/c4Detector.ts
+++ b/packages/mermaid/src/diagrams/c4/c4Detector.ts
@@ -1,8 +1,8 @@
-import type { ExternalDiagramDefinition } from '../../diagram-api/types.js';
+import type { DiagramDetector, ExternalDiagramDefinition } from '../../diagram-api/types.js';
 
 const id = 'c4';
 
-const detector = (txt: string) => {
+const detector: DiagramDetector = (txt) => {
   return /^\s*C4Context|C4Container|C4Component|C4Dynamic|C4Deployment/.test(txt);
 };
 
diff --git a/packages/mermaid/src/diagrams/flowchart/elk/detector.ts b/packages/mermaid/src/diagrams/flowchart/elk/detector.ts
index f2c707aa3..8d7f7c58c 100644
--- a/packages/mermaid/src/diagrams/flowchart/elk/detector.ts
+++ b/packages/mermaid/src/diagrams/flowchart/elk/detector.ts
@@ -1,9 +1,8 @@
-import type { MermaidConfig } from '../../../config.type.js';
 import type { ExternalDiagramDefinition, DiagramDetector } from '../../../diagram-api/types.js';
 
 const id = 'flowchart-elk';
 
-const detector: DiagramDetector = (txt: string, config?: MermaidConfig): boolean => {
+const detector: DiagramDetector = (txt, config): boolean => {
   if (
     // If diagram explicitly states flowchart-elk
     /^\s*flowchart-elk/.test(txt) ||
diff --git a/packages/mermaid/src/diagrams/mindmap/detector.ts b/packages/mermaid/src/diagrams/mindmap/detector.ts
index 0ab3187f7..8627b41ae 100644
--- a/packages/mermaid/src/diagrams/mindmap/detector.ts
+++ b/packages/mermaid/src/diagrams/mindmap/detector.ts
@@ -1,7 +1,7 @@
-import type { ExternalDiagramDefinition } from '../../diagram-api/types.js';
+import type { DiagramDetector, ExternalDiagramDefinition } from '../../diagram-api/types.js';
 const id = 'mindmap';
 
-const detector = (txt: string) => {
+const detector: DiagramDetector = (txt) => {
   return /^\s*mindmap/.test(txt);
 };
 
diff --git a/packages/mermaid/src/diagrams/timeline/detector.ts b/packages/mermaid/src/diagrams/timeline/detector.ts
index 60fecb832..57848b2a2 100644
--- a/packages/mermaid/src/diagrams/timeline/detector.ts
+++ b/packages/mermaid/src/diagrams/timeline/detector.ts
@@ -1,8 +1,8 @@
-import type { ExternalDiagramDefinition } from '../../diagram-api/types.js';
+import type { DiagramDetector, ExternalDiagramDefinition } from '../../diagram-api/types.js';
 
 const id = 'timeline';
 
-const detector = (txt: string) => {
+const detector: DiagramDetector = (txt) => {
   return /^\s*timeline/.test(txt);
 };