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ESLint + Prettier + VSCode (late 2019, 忙しい人向け)

はじめに

プロジェクトフォルダの準備

bash
$ mkdir qiita && cd $_
$ yarn init -y

ESlint, Prettier のインストール

bash
$ yarn add -D eslint prettier eslint-config-prettier eslint-plugin-prettier

babel-eslint のインストール(オプショナル)

bash
yarn add -D babel-eslint

.eslintrc.json の作成

bash
$ touch .eslintrc.json
.eslintrc.json
{
  "env": {
    "es6": true,
    "node": true,
    "browser": true,
    "commonjs": true
  },
  "parser": "babel-esint",
  "parserOptions": {
    "ecmaVersion": 2019,
    "sourceType": "module"
  },
  "extends": [
    "eslint:recommended",
    "plugin:prettier/recommended"
  ],
  "plugins": [
    "prettier"
  ],
  "rules": {
    "prettier/prettier": [
      "error",
      {
        "singleQuote": true,
        "trailingComma": "es5",
        "arrowParens": "always"
      }
    ]
  }
}

Prettier のオプションはこちら(少ない!)

VSCode の設定

  • ESLint拡張をインストールしましょう
  • Prettier拡張は必須ではありません
bash
$ mkdir .vscode
$ touch .vscode/settings.json
.vscode/settings.json
{
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": true
  }
}

以上、超忙しい人向けのメモでした。

参考にさせていただいた記事

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