build: Upgrade ESLint to v9 with flat config #2538
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Migrate from ESLint v8.56 to v9.39 using the new flat config format.
Changes:
- Replace .eslintrc.cjs files with eslint.config.mjs (flat config)
- Remove .eslintignore (ignores now in flat config)
- Update ESLint and related packages to v9-compatible versions
- Add @eslint/js, globals, and typescript-eslint packages
- Update lint scripts to work without --ext flag
- Remove unused eslint-disable directives that are no longer needed
- Replace unused catch(error) bindings with catch {} syntax
The configuration preserves the original linting behavior:
- TypeScript ESLint uses eslintRecommended (not strict recommended)
- react-refresh/only-export-components only applies to shared-front
- testing-library rules only apply to test files
- Import resolution settings match original config
All FE builds pass and tests pass.
Closes boxwise#2308
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Migrate from ESLint v8.56 to v9.39 using the new flat config format as requested in #2308.
Changes:
.eslintrc.cjsfiles witheslint.config.mjs(flat config format).eslintignore(ignores now defined in flat config)@eslint/js,globals, andtypescript-eslintpackages--extflag (handled by flat config)eslint-disabledirectives that are no longer neededcatch(error)bindings withcatch {}syntaxConfiguration preserves original behavior:
eslintRecommended(matchesplugin:@typescript-eslint/eslint-recommended)react-refresh/only-export-componentsonly applies toshared-front(as before)testing-libraryrules only apply to test filesTest plan
pnpm -C front build)pnpm test -- --run)pnpm lint:all)References
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