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feat!: ESLint 9 and Flat Config (#33)
* docs: outline some intended breaking changes in the next major release * feat!: initial implementation without much test * chore: remove vue cli examples * chore: set up new examples * chore: detail the reason for the implicit dependency on pluginVue.configs['flat/base'] * chore: complete the js example * feat: initial implementation of -with-typescript config * chore: update deps * feat!: refactored the -with-typescript config with dependency on @vue/eslint-config-typescript 14.3 * chore: update ts examples * fix: @vue/eslint-config-standard is a dep, not a dev dep * fix: missing dev dep * chore: technically @vue/eslint-config-typescript can be optional * style: don't break lines for consistency with example packages
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‎.changeset/dry-points-agree.md‎

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---
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"@vue/eslint-config-standard": major
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---
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* Supports ESLint ^9.10, Node.js ^18.18.0 || ^20.9.0 || >=21.1.0, drops support for older versions.
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* Supports ESLint Flat Config, drops support for legacy `.eslintrc*` configuration format.
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* Removed `createAliasSetting` helper function, as we now automatically detects path aliases in `jsconfig.json` and `tsconfig.json` files.
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* Removed examples of Vue CLI project setups.
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* Stylistic rules also apply to expressions in `<template>` blocks.
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Internal Changes:
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* Drops `eslint-config-standard` as a dependency as it never released the latest code that would support Flat Config; we have to maintain the rules ourselves.
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* Moved from `eslint-plugin-import` to `eslint-plugin-import-x`.
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* Use stylistic rules from `@stylistic/eslint-plugin` instead of the ESLint built-in ones.
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* Other dependency updates.

‎.changeset/mean-owls-invent.md‎

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---
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"@vue/eslint-config-standard-with-typescript": major
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---
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* Updated `@vue/eslint-config-standard` to v9.*, see its changelog for breaking changes.
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* It's now only a thin wrapper around `@vue/eslint-config-standard`. Please use this package in combination with `@vue/eslint-config-typescript`.
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* Most of the [`typescript-eslint`-specific rules in the previous version](https://unpkg.com/browse/eslint-config-standard-with-typescript@22.0.0/lib/index.js#L65) are now removed. Please refer to [`typescript-eslint` shared configs](https://typescript-eslint.io/users/configs/#recommended-configurations) for more strict rulesets.
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* Removes `createAliasSetting` helper for unconventional TSConfig locations support.

‎README.md‎

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# ESLint [Shareable Configs](http://eslint.org/docs/developer-guide/shareable-configs) for [JavaScript Standard Style](http://standardjs.com) in [Vue.js](https://vuejs.org/) Projects
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# ESLint [Shareable Configs](https://eslint.org/docs/latest/extend/shareable-configs) for [JavaScript Standard Style](http://standardjs.com) in [Vue.js](https://vuejs.org/) Projects
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[![JavaScript Style Guide - Standard Style](https://raw.githubusercontent.com/standard/standard/master/badge.svg)](http://standardjs.com)
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- If you are using ESLint in a JavaScript-only project, check the documentation of [`@vue/eslint-config-standard`](./packages/eslint-config-standard#readme)
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- If you are using ESLint in a TypeScript project, check the documentation of [`@vue/eslint-config-standard-with-typescript`](./packages/eslint-config-standard-with-typescript#readme)
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The [`examples` folder](./examples/) contains example ESLint configurations in projects created by `create-vue` or `@vue/cli`.
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The [`examples` folder](./examples/) contains example ESLint configurations in projects created by `create-vue`.

‎examples/vue-cli-ts/.editorconfig‎ renamed to ‎examples/allow-js/.editorconfig‎

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[*.{js,jsx,ts,tsx,vue}]
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indent_style = space
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[*.{js,jsx,mjs,cjs,ts,tsx,mts,cts,vue}]
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charset = utf-8
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indent_size = 2
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trim_trailing_whitespace = true
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indent_style = space
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insert_final_newline = true
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trim_trailing_whitespace = true

‎examples/create-vue-ts-allow-js-in-vue/.gitignore‎ renamed to ‎examples/allow-js/.gitignore‎

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*.njsproj
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*.sln
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*.sw?
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*.tsbuildinfo

‎examples/allow-js/.vscode/extensions.json‎

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{
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"recommendations": [
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"Vue.volar",
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"vitest.explorer",
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"dbaeumer.vscode-eslint",
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"EditorConfig.EditorConfig"
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]
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}

‎examples/allow-js/README.md‎

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# allow-js
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This template should help get you started developing with Vue 3 in Vite.
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## Recommended IDE Setup
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[VSCode](https://code.visualstudio.com/) + [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar) (and disable Vetur).
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## Type Support for `.vue` Imports in TS
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TypeScript cannot handle type information for `.vue` imports by default, so we replace the `tsc` CLI with `vue-tsc` for type checking. In editors, we need [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar) to make the TypeScript language service aware of `.vue` types.
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## Customize configuration
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See [Vite Configuration Reference](https://vite.dev/config/).
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## Project Setup
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```sh
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pnpm install
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```
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### Compile and Hot-Reload for Development
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```sh
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pnpm dev
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```
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### Type-Check, Compile and Minify for Production
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```sh
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pnpm build
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```
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### Run Unit Tests with [Vitest](https://vitest.dev/)
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```sh
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pnpm test:unit
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```
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### Lint with [ESLint](https://eslint.org/)
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```sh
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pnpm lint
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```

‎examples/create-vue-ts-allow-js-in-vue/env.d.ts‎ renamed to ‎examples/allow-js/env.d.ts‎

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‎examples/allow-js/eslint.config.js‎

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import pluginVue from 'eslint-plugin-vue'
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import vueTsEslintConfig from '@vue/eslint-config-typescript'
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import pluginVitest from '@vitest/eslint-plugin'
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export default [
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{
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name: 'app/files-to-lint',
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files: ['**/*.{ts,mts,tsx,vue}'],
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},
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{
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name: 'app/files-to-ignore',
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ignores: ['**/dist/**', '**/dist-ssr/**', '**/coverage/**'],
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},
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...pluginVue.configs['flat/essential'],
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...vueTsEslintConfig(),
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{
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...pluginVitest.configs.recommended,
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files: ['src/**/__tests__/*'],
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},
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]

‎examples/create-vue-ts-allow-tsx-in-vue/index.html‎ renamed to ‎examples/allow-js/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<html lang="">
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<head>
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<meta charset="UTF-8" />
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<link rel="icon" href="/favicon.ico" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta charset="UTF-8">
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<link rel="icon" href="/favicon.ico">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Vite App</title>
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</head>
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<body>

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