eslint-config-standard-with-typescript

@vue/eslint-config-standard-with-typescript

eslint-config-standard-with-typescript for Vue

This config is specifically designed to be used by @vue/cli & create-vue setups and is not meant for outside use (it can be used but some adaptations on the user side might be needed - for details see the config file).

A part of its design is that this config may implicitly depend on other parts of @vue/cli/create-vue setups, such as eslint-plugin-vue being extended in the same resulting config.

Installation

In order to work around a known limitation in ESLint, we recommend you to use this package alongside @rushstack/eslint-patch, so that you don't have to install too many dependencies:

npm add --dev @vue/eslint-config-standard-with-typescript @rushstack/eslint-patch

Usage

An example .eslintrc.cjs:

require("@rushstack/eslint-patch/modern-module-resolution")

module.exports = {
  root: true,
  extends: [
    'plugin:vue/vue3-essential',
    '@vue/eslint-config-standard-with-typescript'
  ]
}

Aliases

This ruleset automatically reads the TypeScript path mappings from **/tsconfig.json and **/tsconfig.*.json files in the project. You don't need any additional configuration to set up aliases. If your TSConfig files are in a different location, please refer to the Non-Conventional TSConfig Locations section.

JS Support in .vue Files

By default this ruleset only allows using <script lang="ts"> (and <script setup lang="ts">) in .vue files.

If you need to use plain <script> in .vue files:

1. First, set compilerOptions.allowJs to true in your TSConfig.
2. Then, append the allow-js-in-vue ruleset to your .eslintrc.cjs:

require("@rushstack/eslint-patch/modern-module-resolution")

module.exports = {
  root: true,
  extends: [
    'plugin:vue/vue3-essential',
    '@vue/eslint-config-standard-with-typescript'
    '@vue/eslint-config-standard-with-typescript/allow-js-in-vue'
  ]
}

If you encounter any no-undef errors when using global variables/functions, please configure the env option for ESLint.

TSX/JSX Support in .vue Files

There's a limitation in @typescript-eslint/parser that it cannot parse JSX syntaxes in .vue files when parserOptions.project is set.

So, by default, we disallow <script lang="tsx"> and <script lang="jsx"> in .vue files. You can use JSX syntax in standalone .tsx and .jsx files instead.

If you do need to use <script lang="tsx"> or <script lang="jsx"> in your .vue files, you can apply the allow-tsx-in-vue/allow-jsx-in-vue config to all .vue files to disable those rules that require type informations (e.g., no-floating-promises):

require("@rushstack/eslint-patch/modern-module-resolution")

module.exports = {
  root: true,
  extends: [
    'plugin:vue/vue3-essential',
    '@vue/eslint-config-standard-with-typescript',
    '@vue/eslint-config-standard-with-typescript/allow-tsx-in-vue'
  ]
}

Turning on allow-jsx-in-vue would allow both <script lang="tsx"> and <script lang="jsx">, and requiring a carefully configured env field as aforementioned in the JS support section:

require("@rushstack/eslint-patch/modern-module-resolution")

module.exports = {
  root: true,
  extends: [
    'plugin:vue/vue3-essential',
    '@vue/eslint-config-standard-with-typescript',
    '@vue/eslint-config-standard-with-typescript/allow-jsx-in-vue'
  ]
}

Note that doing so would catch fewer errors.

Non-Conventional TSConfig Locations

By default, this ruleset searches for TSConfig files matching **/tsconfig.json and **/tsconfig.*.json from the current working directory. This should cover most use cases.

However, if your TSConfig file is located somewhere else (e.g., in an ancestor directory), or doesn't follow the conventional naming (e.g., named as my-custom-tsconfig.json), you need to specify the location in your .eslintrc.cjs manually:

require("@rushstack/eslint-patch/modern-module-resolution")
const createAliasSetting = require('@vue/eslint-config-standard-with-typescript/createAliasSetting')

module.exports = {
  root: true,
  extends: [
    'plugin:vue/vue3-essential',
    '@vue/eslint-config-standard-with-typescript'
  ],
  parserOptions: {
    project: ['/path/to/my-custom-tsconfig.json']
  },
  settings: {
    ...createAliasSetting(['/path/to/my-custom-tsconfig.json'])
  }
}

Further Improvements

It seems possible to lift the TSX/JSX restriction in .vue files without disabling the type-aware linting rules. @typescript-eslint/parser allows passing program instance to override any programs that would have been computed from parserOptions.project. If we provide a program created by Volar, maybe it can have better support for .vue files? I haven't yet got the time to try it out.