.eslintrc.json

{
  "env": {
    "browser": true,
    "node": true,
    "jest": true
  },

  "plugins": ["import", "no-only-tests"],

  "settings": {
    "import/parsers": {
      "@typescript-eslint/parser": [".ts", ".tsx"]
    },
    "import/resolver": {
      "typescript": {
        "alwaysTryTypes": true
      },
      "node": {
        "extensions": [".js", ".jsx", ".ts", ".tsx", ".json"]
      }
    }
  },

  "overrides": [
    {
      "plugins": ["@typescript-eslint"],
      "parser": "@typescript-eslint/parser",
      "files": ["**/*.ts"],
      "excludedFiles": "*.js",
      "extends": [
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:prettier/recommended"
      ],
      "rules": {
        "no-shadow": "off",
        "@typescript-eslint/no-shadow": "error",
        "@typescript-eslint/no-use-before-define": 0,
        "class-methods-use-this": 0,
        "no-useless-constructor": 0,
        "@typescript-eslint/no-unused-vars": [
          1,
          {
            "argsIgnorePattern": "res|next|^err|_",
            "ignoreRestSiblings": true
          }
        ],
        "@typescript-eslint/semi": 0,
        "import/no-unresolved": "error",
        "prettier/prettier": [
          "error",
          {
            "trailingComma": "all",
            "singleQuote": true,
            "printWidth": 120,
            "semi": false,
            "arrowParens": "avoid"
          }
        ]
      }
    }
  ],

  "extends": ["airbnb-base", "plugin:prettier/recommended"],

  "rules": {
    "no-unused-vars": [
      1,
      {
        "argsIgnorePattern": "res|next|^err|_",
        "ignoreRestSiblings": true
      }
    ],
    "no-use-before-define": 0,
    "semi": 0,
    "import/no-unresolved": "error",
    "import/extensions": [
      "error",
      "ignorePackages",
      {
        "js": "never",
        "mjs": "never",
        "jsx": "never",
        "ts": "never",
        "tsx": "never"
      }
    ],
    "comma-dangle": ["error", "always-multiline"],
    "import/no-extraneous-dependencies": [
      "error",
      {
        "devDependencies": [
          "**/*.test.js",
          "**/*.test.ts",
          "**/testutils/**",
          "cypress.config.ts",
          "test/setupTests.ts"
        ]
      }
    ],
    "no-only-tests/no-only-tests": "error",
    "prettier/prettier": [
      "error",
      {
        "trailingComma": "all",
        "singleQuote": true,
        "printWidth": 120,
        "semi": false,
        "arrowParens": "avoid"
      }
    ],
    "no-empty-function": ["error", { "allow": ["constructors", "arrowFunctions"] }]
  }
}