chore: migrate eslint to flat config, use antfu configs

[MaikoTan]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates the project from traditional ESLint configuration to ESLint flat config using Antfu's opinionated ESLint configuration. This modernizes the linting setup and simplifies configuration management.

• Replaced legacy .eslintrc.yml with modern eslint.config.mjs flat config format
• Updated ESLint from v8 to v9 and adopted @antfu/eslint-config instead of custom config
• Updated ESLint rule references to match new naming conventions (e.g., ts/no-var-requires)

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
eslint.config.mjs	New flat config file with Antfu configuration, React support, and project-specific ignores
package.json	Updated ESLint to v9, added Antfu config and React plugins, removed old TypeScript ESLint dependencies
packages/core/src/index.ts	Updated ESLint disable comment to use new rule naming convention
.eslintrc.yml	Removed legacy ESLint configuration file
.prettierignore	Removed file (likely consolidated into ESLint config ignores)

[github-actions]

PR Health

Build ✅

Details

esbuild: packages/core/src/index.ts -> packages/core/lib/index.js
esbuild: packages/danbooru/src/index.ts -> packages/danbooru/lib/index.js
esbuild: packages/derpibooru/src/index.ts -> packages/derpibooru/lib/index.js
esbuild: packages/e621/src/index.ts -> packages/e621/lib/index.js
esbuild: packages/gelbooru/src/index.ts -> packages/gelbooru/lib/index.js
esbuild: packages/konachan/src/index.ts -> packages/konachan/lib/index.js
esbuild: packages/local/src/index.ts -> packages/local/lib/index.js
esbuild: packages/lolibooru/src/index.ts -> packages/lolibooru/lib/index.js
esbuild: packages/lolicon/src/index.ts -> packages/lolicon/lib/index.js
esbuild: packages/moehu/src/index.ts -> packages/moehu/lib/index.js
esbuild: packages/pixiv/src/index.ts -> packages/pixiv/lib/index.js
esbuild: packages/safebooru/src/index.ts -> packages/safebooru/lib/index.js
esbuild: packages/sankaku/src/index.ts -> packages/sankaku/lib/index.js
esbuild: packages/yande/src/index.ts -> packages/yande/lib/index.js

Lint ❌

Details

Oops! Something went wrong! :(

ESLint: 9.32.0

RangeError: Maximum call stack size exceeded
Occurred while linting /home/runner/work/koishi-plugin-booru/koishi-plugin-booru/packages/pixiv/src/utils.tsx:2
Rule: "style/indent"
  at Map.get (<anonymous>)
  at TokenInfo.getFirstTokenOfLine (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:187:40)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:79)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)
  at OffsetStorage.getDesiredIndent (file:///home/runner/work/koishi-plugin-booru/koishi-plugin-booru/node_modules/@stylistic/eslint-plugin/dist/rules/indent.js:245:46)