Move ELK to standalone package

.build/common.ts

@@ -22,4 +22,9 @@ export const packageOptions = {
     packageName: 'mermaid-zenuml',
     file: 'detector.ts',
   },
+  'mermaid-flowchart-elk': {
+    name: 'mermaid-flowchart-elk',
+    packageName: 'mermaid-flowchart-elk',
+    file: 'detector.ts',
+  },
 } as const;

.build/types.ts

@@ -0,0 +1,16 @@
+import { packageOptions } from './common.js';
+import { execSync } from 'child_process';
+
+const buildType = (packageName: string) => {
+  console.log(`Building types for ${packageName}`);
+  try {
+    const out = execSync(`tsc -p ./packages/${packageName}/tsconfig.json --emitDeclarationOnly`);
+    out.length > 0 && console.log(out.toString());
+  } catch (e) {
+    console.error(e);
+  }
+};
+
+for (const { packageName } of Object.values(packageOptions)) {
+  buildType(packageName);
+}

.esbuild/server.ts

@@ -5,38 +5,25 @@ import { getBuildConfig, defaultOptions } from './util.js';
 import { context } from 'esbuild';
 import chokidar from 'chokidar';
 import { generateLangium } from '../.build/generateLangium.js';
+import { packageOptions } from '../.build/common.js';
 
-const parserCtx = await context(
-  getBuildConfig({ ...defaultOptions, minify: false, core: false, entryName: 'parser' })
+const configs = Object.values(packageOptions).map(({ packageName }) =>
+  getBuildConfig({ ...defaultOptions, minify: false, core: false, entryName: packageName })
 );
-const mermaidCtx = await context(
-  getBuildConfig({ ...defaultOptions, minify: false, core: false, entryName: 'mermaid' })
-);
-const mermaidIIFECtx = await context(
-  getBuildConfig({
-    ...defaultOptions,
-    minify: false,
-    core: false,
-    entryName: 'mermaid',
-    format: 'iife',
-  })
-);
-const externalCtx = await context(
-  getBuildConfig({
-    ...defaultOptions,
-    minify: false,
-    core: false,
-    entryName: 'mermaid-example-diagram',
-  })
-);
-const zenumlCtx = await context(
-  getBuildConfig({ ...defaultOptions, minify: false, core: false, entryName: 'mermaid-zenuml' })
-);
-const contexts = [parserCtx, mermaidCtx, mermaidIIFECtx, externalCtx, zenumlCtx];
+const mermaidIIFEConfig = getBuildConfig({
+  ...defaultOptions,
+  minify: false,
+  core: false,
+  entryName: 'mermaid',
+  format: 'iife',
+});
+configs.push(mermaidIIFEConfig);
+
+const contexts = await Promise.all(configs.map((config) => context(config)));
 
 const rebuildAll = async () => {
   console.time('Rebuild time');
-  await Promise.all(contexts.map((ctx) => ctx.rebuild()));
+  await Promise.all(contexts.map((ctx) => ctx.rebuild())).catch((e) => console.error(e));
   console.timeEnd('Rebuild time');
 };
 
@@ -101,10 +88,9 @@ async function createServer() {
 
   app.use(cors());
   app.get('/events', eventsHandler);
-  app.use(express.static('./packages/parser/dist'));
-  app.use(express.static('./packages/mermaid/dist'));
-  app.use(express.static('./packages/mermaid-zenuml/dist'));
-  app.use(express.static('./packages/mermaid-example-diagram/dist'));
+  for (const { packageName } of Object.values(packageOptions)) {
+    app.use(express.static(`./packages/${packageName}/dist`));
+  }
   app.use(express.static('demos'));
   app.use(express.static('cypress/platform'));
 

.github/codecov.yaml

@@ -15,3 +15,4 @@ coverage:
       # Turing off for now as code coverage isn't stable and causes unnecessary build failures.
       # default:
       #   threshold: 2%
+    patch: off

.vite/server.ts

@@ -1,6 +1,7 @@
 import express from 'express';
 import cors from 'cors';
 import { createServer as createViteServer } from 'vite';
+import { packageOptions } from '../.build/common.js';
 
 async function createServer() {
   const app = express();
@@ -14,10 +15,9 @@ async function createServer() {
   });
 
   app.use(cors());
-  app.use(express.static('./packages/parser/dist'));
-  app.use(express.static('./packages/mermaid/dist'));
-  app.use(express.static('./packages/mermaid-zenuml/dist'));
-  app.use(express.static('./packages/mermaid-example-diagram/dist'));
+  for (const { packageName } of Object.values(packageOptions)) {
+    app.use(express.static(`./packages/${packageName}/dist`));
+  }
   app.use(vite.middlewares);
   app.use(express.static('demos'));
   app.use(express.static('cypress/platform'));

cypress/integration/other/flowchart-elk.spec.js

@@ -0,0 +1,14 @@
+import { urlSnapshotTest, openURLAndVerifyRendering } from '../../helpers/util.ts';
+
+describe('Flowchart elk', () => {
+  it('should use dagre as fallback', () => {
+    urlSnapshotTest('http://localhost:9000/flow-elk.html', {
+      name: 'flow-elk fallback to dagre',
+    });
+  });
+  it('should allow overriding with external package', () => {
+    urlSnapshotTest('http://localhost:9000/flow-elk.html?elk=true', {
+      name: 'flow-elk overriding dagre with elk',
+    });
+  });
+});

cypress/platform/flow-elk.html

@@ -0,0 +1,28 @@
+<html>
+  <body>
+    <pre class="mermaid">
+      flowchart-elk
+      a[hello] --> b[world]
+      b --> c{test}
+      c --> one
+      c --> two
+      c --> three
+    </pre>
+
+    <script type="module">
+      import mermaid from './mermaid.esm.mjs';
+      import elk from './mermaid-flowchart-elk.esm.min.mjs';
+      if (window.location.search.includes('elk')) {
+        await mermaid.registerExternalDiagrams([elk]);
+      }
+      mermaid.initialize({
+        logLevel: 3,
+        startOnLoad: false,
+      });
+      await mermaid.run();
+      if (window.Cypress) {
+        window.rendered = true;
+      }
+    </script>
+  </body>
+</html>

demos/flowchart-elk.html

@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <title>Mermaid Flowchart ELK Test Page</title>
+  </head>
+
+  <body>
+    <h1>Flowchart ELK</h1>
+    <pre class="mermaid">
+		flowchart-elk TD
+      A([Start]) ==> B[Step 1]
+      B ==> C{Flow 1}
+      C -- Choice 1.1 --> D[Step 2.1]
+      C -- Choice 1.3 --> I[Step 2.3]
+      C == Choice 1.2 ==> E[Step 2.2]
+      D --> F{Flow 2}
+      E ==> F{Flow 2}
+      F{Flow 2} == Choice 2.1 ==> H[Feedback node]
+      H[Feedback node] ==> B[Step 1]
+      F{Flow 2} == Choice 2.2 ==> G((Finish))
+
+    </pre>
+
+    <script type="module">
+      import mermaid from './mermaid.esm.mjs';
+      import flowchartELK from './mermaid-flowchart-elk.esm.mjs';
+      await mermaid.registerExternalDiagrams([flowchartELK]);
+      mermaid.initialize({
+        logLevel: 3,
+      });
+    </script>
+  </body>
+</html>

package.json

@@ -19,7 +19,7 @@
     "build:esbuild": "pnpm run -r clean && ts-node-esm --transpileOnly .esbuild/build.ts",
     "build:mermaid": "pnpm build:esbuild --mermaid",
     "build:viz": "pnpm build:esbuild --visualize",
-    "build:types": "tsc -p ./packages/parser/tsconfig.json --emitDeclarationOnly && tsc -p ./packages/mermaid/tsconfig.json --emitDeclarationOnly && tsc -p ./packages/mermaid-zenuml/tsconfig.json --emitDeclarationOnly && tsc -p ./packages/mermaid-example-diagram/tsconfig.json --emitDeclarationOnly",
+    "build:types": "ts-node-esm --transpileOnly .build/types.ts",
     "build:types:watch": "tsc -p ./packages/mermaid/tsconfig.json --emitDeclarationOnly --watch",
     "dev": "ts-node-esm --transpileOnly .esbuild/server.ts",
     "dev:vite": "ts-node-esm --transpileOnly .vite/server.ts",

packages/mermaid-flowchart-elk/package.json

@@ -0,0 +1,45 @@
+{
+  "name": "@mermaid-js/flowchart-elk",
+  "version": "1.0.0",
+  "description": "Flowchart plugin for mermaid with ELK layout",
+  "module": "dist/mermaid-flowchart-elk.core.mjs",
+  "types": "dist/packages/mermaid-flowchart-elk/src/detector.d.ts",
+  "type": "module",
+  "exports": {
+    ".": {
+      "import": "./dist/mermaid-flowchart-elk.core.mjs",
+      "types": "./dist/packages/mermaid-flowchart-elk/src/detector.d.ts"
+    },
+    "./*": "./*"
+  },
+  "keywords": [
+    "diagram",
+    "markdown",
+    "flowchart",
+    "elk",
+    "mermaid"
+  ],
+  "scripts": {
+    "prepublishOnly": "pnpm -w run build"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mermaid-js/mermaid"
+  },
+  "author": "Knut Sveidqvist",
+  "license": "MIT",
+  "dependencies": {
+    "d3": "^7.4.0",
+    "dagre-d3-es": "7.0.10",
+    "khroma": "^2.0.0",
+    "elkjs": "^0.8.2"
+  },
+  "devDependencies": {
+    "concurrently": "^8.0.0",
+    "rimraf": "^5.0.0",
+    "mermaid": "workspace:^"
+  },
+  "files": [
+    "dist"
+  ]
+}

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

@@ -0,0 +1,32 @@
+import type {
+  ExternalDiagramDefinition,
+  DiagramDetector,
+  DiagramLoader,
+} from '../../mermaid/src/diagram-api/types.js';
+
+const id = 'flowchart-elk';
+
+const detector: DiagramDetector = (txt, config): boolean => {
+  if (
+    // 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')
+  ) {
+    return true;
+  }
+  return false;
+};
+
+const loader: DiagramLoader = async () => {
+  const { diagram } = await import('./diagram-definition.js');
+  return { id, diagram };
+};
+
+const plugin: ExternalDiagramDefinition = {
+  id,
+  detector,
+  loader,
+};
+
+export default plugin;

packages/mermaid-flowchart-elk/src/diagram-definition.ts

@@ -0,0 +1,12 @@
+// @ts-ignore: JISON typing missing
+import parser from '../../mermaid/src/diagrams/flowchart/parser/flow.jison';
+import * as db from '../../mermaid/src/diagrams/flowchart/flowDb.js';
+import styles from '../../mermaid/src/diagrams/flowchart/styles.js';
+import renderer from './flowRenderer-elk.js';
+
+export const diagram = {
+  db,
+  renderer,
+  parser,
+  styles,
+};

packages/mermaid/src/diagrams/flowchart/elk/flowRenderer-elk.js → packages/mermaid-flowchart-elk/src/flowRenderer-elk.js

@@ -1,16 +1,16 @@
 import { select, line, curveLinear } from 'd3';
-import { insertNode } from '../../../dagre-wrapper/nodes.js';
-import insertMarkers from '../../../dagre-wrapper/markers.js';
-import { insertEdgeLabel } from '../../../dagre-wrapper/edges.js';
+import { insertNode } from '../../mermaid/src/dagre-wrapper/nodes.js';
+import insertMarkers from '../../mermaid/src/dagre-wrapper/markers.js';
+import { insertEdgeLabel } from '../../mermaid/src/dagre-wrapper/edges.js';
 import { findCommonAncestor } from './render-utils.js';
-import { labelHelper } from '../../../dagre-wrapper/shapes/util.js';
-import { getConfig } from '../../../config.js';
-import { log } from '../../../logger.js';
-import { setupGraphViewbox } from '../../../setupGraphViewbox.js';
-import common from '../../common/common.js';
-import { interpolateToCurve, getStylesFromArray } from '../../../utils.js';
+import { labelHelper } from '../../mermaid/src/dagre-wrapper/shapes/util.js';
+import { getConfig } from '../../mermaid/src/config.js';
+import { log } from '../../mermaid/src/logger.js';
+import { setupGraphViewbox } from '../../mermaid/src/setupGraphViewbox.js';
+import common from '../../mermaid/src/diagrams/common/common.js';
+import { interpolateToCurve, getStylesFromArray } from '../../mermaid/src/utils.js';
 import ELK from 'elkjs/lib/elk.bundled.js';
-import { getLineFunctionsWithOffset } from '../../../utils/lineWithOffset.js';
+import { getLineFunctionsWithOffset } from '../../mermaid/src/utils/lineWithOffset.js';
 
 const elk = new ELK();
 
@@ -695,7 +695,7 @@ const addMarkersToEdge = function (svgPath, edgeData, diagramType, arrowMarkerAb
  *
  * @param text
  * @param diagObj
- * @returns {Record<string, import('../../../diagram-api/types.js').DiagramStyleClassDef>} ClassDef styles
+ * @returns {Record<string, import('../../mermaid/src/diagram-api/types.js').DiagramStyleClassDef>} ClassDef styles
  */
 export const getClasses = function (text, diagObj) {
   log.info('Extracting classes');

packages/mermaid-flowchart-elk/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "../..",
+    "outDir": "./dist"
+  },
+  "include": ["./src/**/*.ts"],
+  "typeRoots": ["./src/types"]
+}

packages/mermaid/package.json

@@ -68,7 +68,6 @@
     "dagre-d3-es": "7.0.10",
     "dayjs": "^1.11.7",
     "dompurify": "^3.0.5",
-    "elkjs": "^0.8.2",
     "khroma": "^2.0.0",
     "lodash-es": "^4.17.21",
     "mdast-util-from-markdown": "^1.3.0",

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

@@ -71,10 +71,9 @@ export const registerLazyLoadedDiagrams = (...diagrams: ExternalDiagramDefinitio
 
 export const addDetector = (key: string, detector: DiagramDetector, loader?: DiagramLoader) => {
   if (detectors[key]) {
-    log.error(`Detector with key ${key} already exists`);
-  } else {
-    detectors[key] = { detector, loader };
+    log.warn(`Detector with key ${key} already exists. Overwriting.`);
   }
+  detectors[key] = { detector, loader };
   log.debug(`Detector with key ${key} added${loader ? ' with loader' : ''}`);
 };
 

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

@@ -49,7 +49,7 @@ export const registerDiagram = (
   detector?: DiagramDetector
 ) => {
   if (diagrams[id]) {
-    throw new Error(`Diagram ${id} already registered.`);
+    log.warn(`Diagram with id ${id} already registered. Overwriting.`);
   }
   diagrams[id] = diagram;
   if (detector) {