chore(lint): upgrade ESLint to v10, migrate to @eslint-react

[DerekRoberts]

Summary

Upgrades the ESLint ecosystem to v10 and migrates the frontend from eslint-plugin-react (v7, incompatible with ESLint v10) to @eslint-react/eslint-plugin.

Changes

Frontend

• Upgrade dependencies:
  • eslint: ^9.38.0 → ^10.2.0
  • @eslint/js: ^9.38.0 → ^10.0.1
  • typescript-eslint: ^8.58.0 → ^8.58.2
• Replace React linting:
  • Remove: eslint-plugin-react, eslint-plugin-react-hooks
  • Add: @eslint-react/eslint-plugin (ESLint v10 compatible)
• Update frontend/eslint.config.mjs:
  • Use @eslint-react/configs['recommended-typescript']
  • Preserve existing custom rules (Prettier integration, TS overrides, etc.)
• Update frontend/package-lock.json

Backend

• Upgrade dependencies:
  • eslint: ^10.0.0 → ^10.2.0
  • @eslint/js: ^10.0.0 → ^10.0.1
  • typescript-eslint: ^8.58.0 → ^8.58.2
• Update backend/package-lock.json

Verification

• npm run lint passes in both frontend/ and backend/ during development.
• CI workflows will validate linting on PR.

Related

• Replaces Renovate PR chore(deps): update linters to v10 (major) - autoclosed #2654 (which only bumped eslint and @eslint/js to v10, but was blocked due to eslint-plugin-react incompatibility)
• eslint-plugin-react does not support ESLint v10 (tracked in ESLint v10 compatibility jsx-eslint/eslint-plugin-react#3977)
• @eslint-react/eslint-plugin is the recommended migration path for ESLint v10 React projects

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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​nestjs/​schematics@​11.0.10 ⏵ 11.1.0			+1	+2
	typescript-eslint@​8.58.0 ⏵ 8.58.2
	jsdom@​29.0.1 ⏵ 29.0.2	+1		+1
	@​vitest/​ui@​4.1.2 ⏵ 4.1.4	+1			-1
	@​tanstack/​react-router@​1.168.10 ⏵ 1.168.23	+1		+1	+2
	@​tanstack/​router-plugin@​1.167.12 ⏵ 1.167.22				+2
	vitest@​4.1.2 ⏵ 4.1.4			+1	-1
	@​vitest/​coverage-v8@​4.1.2 ⏵ 4.1.4
	@​types/​node@​24.12.0 ⏵ 24.12.2	+1		+1	-1
	vite@​8.0.5 ⏵ 8.0.8	+1		+1
	@​prisma/​adapter-pg@​7.6.0 ⏵ 7.7.0	+1		+1	+1
	react@​19.2.4 ⏵ 19.2.5
	@​prisma/​client@​7.6.0 ⏵ 7.7.0	+1		+1
	@​nestjs/​cli@​11.0.17 ⏵ 11.0.21			+1	+1
	@​nestjs/​config@​4.0.3 ⏵ 4.0.4				+5
	@​nestjs/​swagger@​11.2.6 ⏵ 11.3.0	+1		+1	+7
	eslint@​9.39.4 ⏵ 10.2.1	+1
	typescript@​6.0.2 ⏵ 6.0.3
	prettier@​3.8.1 ⏵ 3.8.3			+1
	sass-embedded@​1.98.0 ⏵ 1.99.0	+1		+1
	@​swc/​core@​1.15.21 ⏵ 1.15.26				+1
	react-dom@​19.2.4 ⏵ 19.2.5
	msw@​2.12.14 ⏵ 2.13.4				+2
	sass@​1.98.0 ⏵ 1.99.0	+1
	@​nestjs/​core@​11.1.18 ⏵ 11.1.19
	@​nestjs/​common@​11.1.17 ⏵ 11.1.19	+1
	@​nestjs/​testing@​11.1.17 ⏵ 11.1.19
	dotenv@​17.2.3 ⏵ 17.4.2
	@​eslint-react/​eslint-plugin@​4.2.3
	@​nestjs/​platform-express@​11.1.17 ⏵ 11.1.19	+1			+1

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[Copilot]

Pull request overview

Upgrades the repo’s ESLint toolchain to ESLint v10 and updates the frontend React linting setup to use @eslint-react/eslint-plugin (compatible with ESLint v10), along with lockfile refreshes.

Changes:

• Bump ESLint / @eslint/js / typescript-eslint versions in both frontend/ and backend/.
• Migrate frontend linting from eslint-plugin-react(+hooks) to @eslint-react/eslint-plugin and refactor frontend/eslint.config.mjs.
• Refresh backend/package-lock.json to reflect updated dependency resolution.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 4 comments.

File	Description
frontend/package.json	Updates ESLint-related devDependencies and swaps React lint plugin to @eslint-react/eslint-plugin.
frontend/eslint.config.mjs	Refactors flat config structure and applies @eslint-react recommended TypeScript config.
backend/package.json	Bumps ESLint-related devDependencies to the requested versions.
backend/package-lock.json	Updates lockfile resolution (includes broader dependency bumps beyond lint packages).

Files not reviewed (1)

• backend/package-lock.json: Language not supported

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