[nikku]

Proposed Changes

• Lifts up the project to our modern foundations
• Adds CI 😉

Checklist

Ensure you provide everything we need to review your contribution:

• Contribution meets our definition of done
• Pull request establishes context
  • Link to related issue(s), i.e. Closes {LINK_TO_ISSUE} or Related to {LINK_TO_ISSUE}
  • Brief textual description of the changes
  • Screenshots or short videos showing UI/UX changes
  • Steps to try out, i.e. using the @bpmn-io/sr tool

[Copilot]

Pull request overview

Updates the project’s development tooling baseline (linting, testing, dependencies) and introduces a GitHub Actions CI workflow to run the standard build pipeline on pushes/PRs.

Changes:

• Upgrades key devDependencies (ESLint v9 + flat config, Mocha/Chai, Puppeteer, Karma-related packages).
• Switches ESLint configuration from legacy .eslintrc/.eslintignore to eslint.config.mjs.
• Adds a CI workflow and adjusts Karma to use Puppeteer-provided Chrome.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/spec/commentsSpec.js	Adds explicit Chai expect import (consistent with removing sinon-chai Karma integration).
test/.eslintrc	Removes legacy test ESLint config (replaced by flat config).
package.json	Modernizes toolchain dependencies and swaps npm-run-all → npm-run-all2.
karma.conf.js	Uses Puppeteer Chrome binary and removes sinon-chai framework from Karma.
eslint.config.mjs	Introduces ESLint flat config with browser/node/mocha presets and global ignores.
.github/workflows/CI.yml	Adds CI workflow running npm ci + npm run all.
.eslintrc	Removes legacy ESLint config (replaced by flat config).
.eslintignore	Removes legacy ignore file (replaced by flat config ignores).

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