feat #5042: Add `flowchart.maxEdges` config.

packages/mermaid/src/config.type.ts

@@ -1431,6 +1431,11 @@ export interface FlowchartDiagramConfig extends BaseDiagramConfig {
    *
    */
   htmlLabels?: boolean;
+  /**
+   * Defines the maximum number of edges that can be drawn in a graph.
+   *
+   */
+  maxEdges?: number;
   /**
    * Defines the spacing between nodes on the same level
    *

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

@@ -12,7 +12,6 @@ import {
   setDiagramTitle,
   getDiagramTitle,
 } from '../common/commonDb.js';
-import errorDiagram from '../error/errorDiagram.js';
 
 const MERMAID_DOM_ID_PREFIX = 'flowchart-';
 let vertexCounter = 0;
@@ -92,7 +91,6 @@ export const addVertex = function (_id, textObj, type, style, classes, dir, prop
     if (txt[0] === '"' && txt[txt.length - 1] === '"') {
       txt = txt.substring(1, txt.length - 1);
     }
-
     vertices[id].text = txt;
   } else {
     if (vertices[id].text === undefined) {
@@ -160,11 +158,11 @@ export const addSingleLink = function (_start, _end, type) {
   if (edge?.length > 10) {
     edge.length = 10;
   }
-  if (edges.length < 280) {
+  if (edges.length < (config.flowchart.maxEdges ?? 500)) {
     log.info('abc78 pushing edge...');
     edges.push(edge);
   } else {
-    throw new Error('Too many edges');
+    throw new Error(`Edge limit exceeded. Increase config.flowchart.maxEdges to allow more edges.`);
   }
 };
 export const addLink = function (_start, _end, type) {
@@ -460,6 +458,7 @@ export const clear = function (ver = 'gen-1') {
   tooltips = {};
   firstGraphFlag = true;
   version = ver;
+  config = getConfig();
   commonClear();
 };
 export const setGen = (ver) => {

packages/mermaid/src/schemas/config.schema.yaml

@@ -1900,6 +1900,12 @@ $defs: # JSON Schema definition (maybe we should move these to a separate file)
           Flag for setting whether or not a html tag should be used for rendering labels on the edges.
         type: boolean
         default: true
+      maxEdges:
+        description: |
+          Defines the maximum number of edges that can be drawn in a graph.
+        type: integer
+        default: 500
+        minimum: 0
       nodeSpacing:
         description: |
           Defines the spacing between nodes on the same level