.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": "latest"
  },
  "env": {
    "browser": true,
    "node": true,
    "commonjs": true,
    "es2021": true
  },
  "globals": { "_": true },
  "plugins": ["import", "html"],
  "extends": ["airbnb-base", "prettier"],
  "rules": {
    // "off" or 0 - turn the rule off
    // "warn" or 1 - turn the rule on as a warning (doesn’t affect exit code)
    // "error" or 2 - turn the rule on as an error (exit code is 1 when triggered)
    // "no-var": "off",
    "no-console": "warn",
    "no-plusplus": "off",
    "no-shadow": "off",
    "vars-on-top": "off",
    "no-underscore-dangle": "off", // var _foo;
    "comma-dangle": "off",
    "func-names": "off", // setTimeout(function () {}, 0);
    "prefer-template": "off",
    "linebreak-style": 0,
    "no-nested-ternary": "off",
    "max-classes-per-file": "off",
    "consistent-return": "off",
    "no-restricted-syntax": ["off", "ForOfStatement"], // disallow specified syntax(ex. WithStatement)
    "prefer-arrow-callback": "error", // Require using arrow functions for callbacks
    "require-await": "error",
    "arrow-parens": ["error", "as-needed"], // a => {}
    "no-param-reassign": ["error", { "props": false }],
    "no-unused-expressions": [
      "error",
      {
        "allowTernary": true, // a || b
        "allowShortCircuit": true, // a ? b : 0
        "allowTaggedTemplates": true
      }
    ],
    "import/no-extraneous-dependencies": ["error", { "devDependencies": true }],
    "max-len": [
      "error",
      {
        "code": 120,
        "ignoreComments": true,
        "ignoreStrings": true,
        "ignoreTemplateLiterals": true
      }
    ] // prettier의 printWidth 옵션 대신 사용
  }
}