注意

自分のメモ用です[参考]
以下をやると npm run lint や　npm run format でコードがきれいになります。
また、git commit 時にちゃんとコードがきれいかチェックしてくれます。

環境(動いた環境)

"typescript": "^4.1.3"
"react": "17.0.1"
"next": "10.0.5"

インストール

npm i -D eslint prettier eslint-plugin-react eslint-plugin-react-hooks eslint-config-prettier eslint-plugin-prettier eslint-plugin-jsx-a11y @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint-plugin-simple-import-sort husky lint-staged

プロジェクトルートにファイル作成

touch .eslintrc.js .prettierrc .eslintignore .prettierignore

.eslintrc.js

module.exports = {
    root: true, // Make sure eslint picks up the config at the root of the directory
    parser: '@typescript-eslint/parser',
    parserOptions: {
        ecmaVersion: 2021, // Use the latest ecmascript standard
        sourceType: 'module', // Allows using import/export statements
        ecmaFeatures: {
            jsx: true // Enable JSX since we're using React
        }
    },
    settings: {
        react: {
            version: 'detect' // Automatically detect the react version
        }
    },
    env: {
        browser: true, // Enables browser globals like window and document
        amd: true, // Enables require() and define() as global variables as per the amd spec.
        node: true // Enables Node.js global variables and Node.js scoping.
    },
    plugins: ['simple-import-sort'],
    extends: [
        'eslint:recommended',
        'plugin:@typescript-eslint/eslint-recommended',
        'plugin:@typescript-eslint/recommended',
        'plugin:react/recommended',
        'plugin:react-hooks/recommended',
        'plugin:jsx-a11y/recommended',
        'prettier/@typescript-eslint',
        'plugin:prettier/recommended' // Make this the last element so prettier config overrides other formatting rules
    ],
    rules: {
        'prettier/prettier': ['error', {}, { usePrettierrc: true }], // Use our .prettierrc file as source
        'react/react-in-jsx-scope': 'off',
        'react/prop-types': 'off',
        '@typescript-eslint/explicit-function-return-type': 'off',
        'simple-import-sort/imports': 'error',
        'jsx-a11y/anchor-is-valid': [
            'error',
            {
                components: ['Link'],
                specialLink: ['hrefLeft', 'hrefRight'],
                aspects: ['invalidHref', 'preferButton']
            }
        ]
    }
};

.prettierrc

{
  "semi": true,
  "tabWidth": 4,
  "printWidth": 100,
  "singleQuote": true,
  "trailingComma": "none",
  "jsxBracketSameLine": true
}

.eslintignoreと.prettierignore

node_modules
.next

package.jsonに追記

package.json

{

  ...

  "scripts": {
    ...

    "lint": "eslint --fix .",
    "format": "prettier --write './**/*.{js,jsx,ts,tsx,css,md,json}' --config ./.prettierrc"
  },

  ...

  "husky": {
    "hooks": {
      "pre-commit": "lint-staged"
    }
  },
  "lint-staged": {
    "./**/*.{js,jsx,ts,tsx}": [
      "eslint --fix"
    ]
  }

  ...

}