Is your feature request related to a problem? Please describe.

Currently (as of v0.19.0), the maxGraph npm package only provides ES modules.

CommonJS support was removed in v0.5.0. At that time, it was only provided as a single bundle file (UMD).

But several users have reported issues when using maxGraph in environments where CommonJS is still the default. For example:

• #790: Jest doesn't use ESM out of the box and requires extra setup:
  • https://jestjs.io/docs/ecmascript-modules
  • https://kulshekhar.github.io/ts-jest/docs/guides/esm-support

In applications with large Jest-based test suites written in CommonJS, just adding maxGraph forces a full migration to ESM, which can be a major blocker.

➡️ Example: In bpmn-visualization, migrating from mxGraph to maxGraph required updating 3,000+ test and helper files. See PR #3098.

Another use case: headless SVG rendering using Node.js and jsdom (see #761). While Node supports ESM, some apps are still built in CommonJS — which currently prevents using maxGraph at all.

Describe the solution you'd like

Publish a dual ESM + CJS build in the npm package, including types if necessary.

This would help:

• Use maxGraph in test environments like Jest (via ts-jest or pure JS)
• Use maxGraph headlessly in Node.js (e.g., SVG export)

Additional context

Here are some dual-build strategies used in the community:

• Anthony Fu: Publishing ESM and CJS
• tsup (based on esbuild):
  tsup src/index.ts --format cjs,esm --dts --clean
  https://github.com/egoist/tsup
• unbuild (based on rollup):
  https://github.com/unjs/unbuild
• Manual Rollup config example: https://github.com/toss/es-toolkit/blob/main/rollup.config.mjs
• Run tsc twice: once for ESM (output to lib/esm), once for CJS (lib/cjs). See https://medium.com/ekino-france/supporting-dual-package-for-cjs-and-esm-in-typescript-library-b5feabac1357

Suggested tasks

• Create a minimal Jest + CommonJS reproduction example using ts-jest
• Check that types are correctly resolved with that setup
• Create a Node.js example providing a script that uses maxGraph with CommonJS + jsdom (see ideas in Running maxgraph headlessly #761)
• Validate that there is no impact on the bundle size of the existing examples
• In the node.js example, add link to the issue explaining why this is currently not working with ESM