.eslintrc.json

// copied config
// from https://qiita.com/hasehiro0828/items/ef1736e871b85b039212

{
  "extends": [
    // "airbnb",
    // "plugin:@typescript-eslint/recommended",
    // "airbnb-typescript",
    "next/core-web-vitals",
    "prettier"
  ],
  "plugins": ["@typescript-eslint", "unused-imports"], // unused-imports を追加
  "rules": {
    "no-shadow": "error", // https://eslint.org/docs/rules/no-shadow
    "@typescript-eslint/explicit-function-return-type": "warn", // 返り値の型を明示するためのルール
    "unused-imports/no-unused-imports": "error",
    "unused-imports/no-unused-vars": [
      "warn",
      {
        "vars": "all",
        "varsIgnorePattern": "^_",
        "args": "after-used",
        "argsIgnorePattern": "^_"
      }
    ],
    "import/order": [
      // import の順番を決めます
      "error",
      {
        "groups": [
          "builtin",
          "external",
          "parent",
          "sibling",
          "index",
          "object",
          "type"
        ],
        // pathGroups: [
        //   {
        //     pattern: "@alias/**",
        //     group: "parent",
        //     position: "before",
        //   },
        // ],
        "alphabetize": {
          "order": "asc"
        },
        "newlines-between": "always"
      }
    ]
  }
}