Update eslint and evaluate babel needing

[offtherailz]

Description

Our current version of eslint is very old and is a constrant for productivity (automation and checks) expecially for JSON parsing that have to be done manually.

Here the version support: https://eslint.org/version-support/

We need to find a way to updated it.
we need aslo to evaluate babel needing, because now espree works better with prettier etc..

• Here in a branch I tried to update eslint and remove babel and

(to use the branch here you need to:

cd utility/eslint/
npm link
cd ../..
npm link @mapstore/eslint-config-mapstore

The branch contains only partial work.
Need to (not complete list):

• Clean up rules to adhere as much as possible to new standards
• Fix new issues found on lint (not committed to avoid conflicts)
• Update project creation
• Properly test all features
• Update extension project too
• Migration guidelines

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information

[offtherailz]

@tdipisa assigned to you to schedule investigation for this in the future.

[jna4k]

Hello there

If you still need eslint-plugin-import, then I suggest that you look into replacing it with eslint-plugin-import-x, which is a lightweight fork with much fewer dependencies, 121 vs 16.

[rowheat02]

This branch (ESLint 9, Babel removed, esbuild, flat config) was tested with additional configuration work to validate the upgrade path. The testing included adding @eslint/compat to support legacy plugins in flat config, declaring ESM via "type": "module" in utility/eslint/package.json, and moving the root configuration to eslint.config.mjs so Node loads it as a module without converting the entire repository to ESM. Several rule adjustments were applied to allow lint to pass, including:

• Disabling indent
• Downgrading semi, space-infix-ops, and react/self-closing-comp to warnings
• Configuring no-unused-vars with caughtErrors: "none"
• Configuring react/no-unknown-property with an ignore list for React-Bootstrap props (bsRole, bsClass, bsSize, bsStyle)
• Setting settings.react.version to "detect"

No application code was changed; only ESLint configuration and rule severity levels were modified.

---

Next steps appear feasible and can proceed in this direction from the branch. A decision is needed on the configuration strategy:

• Define a new rule set without @eslint/compat, or
• Continue evolving the existing shared config using compat.

Following that, do this: use the root ESLint config as eslint.config.mjs and add "type": "module" in utility/eslint/package.json; re-tighten rules according to ESLint 9 and plugin best practices, fix all lint rules in the lint config, update project creation and extension templates, run full regression testing, and document migration guidelines.

For project creation, updates would include removing parserOptions.babelOptions from generated package.json in createProject.js, switching to flat config by generating or copying an eslint.config.mjs, updating the lint script in utility/projects/projectScripts.json to eslint js, optionally adding an eslint.config.mjs template under project/standard/templates/, and updating docs/developer-guide/project-creation-script.md.

For extension templates, the MapStoreExtension repository would need alignment of package.json (ESLint 9, no Babel, same plugins), addition of flat config (eslint.config.mjs), updates to the extension build setup (webpack/Karma) to match MapStore2 (e.g., esbuild where applicable), and documentation updates in docs/developer-guide/extensions.md.

As optional future work, eslint-plugin-import could be replaced with eslint-plugin-import-x, which provides a lighter dependency tree, native flat-config support, and works as a drop-in replacement.

[tdipisa]

@rowheat02 thank you, assigning to @offtherailz for a review as soon as possible