.eslintrc

{
    "root": true,
    "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:@typescript-eslint/recommended-requiring-type-checking",
        "plugin:jest/recommended",
        "plugin:jest/style",
        "prettier"
    ],
    "plugins": [
        "jest",
        "@typescript-eslint"
    ],
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
        "project": [
            "src/tsconfig.json",
            "test/tsconfig.json"
        ]
    },
    "env": {
        "jest/globals": true,
        "es2021": true,
        "node": true
    },
    "rules": {
        "jest/consistent-test-it": ["error", { "fn": "test" }],
        "jest/require-top-level-describe": ["error"],
            // テンプレートリテラルでundefinedやunknownを使えるように
        "@typescript-eslint/restrict-template-expressions": "off",
        // _で始まる変数/引数等は対象外
        "@typescript-eslint/no-unused-vars": [
            "error", {
                "argsIgnorePattern": "^_",
                "varsIgnorePattern": "^_",
                "caughtErrorsIgnorePattern": "^_",
                "destructuredArrayIgnorePattern": "^_"
            }
        ]
    }
}