.eslintrc.json

{
  "env": {
    "es6": true,
    "browser": true
  },
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2019
  },
  "plugins": [
    "no-only-tests",
    "simple-import-sort",
    "es"
  ],
  "extends": [
    "vaadin/typescript",
    "vaadin/testing",
    "vaadin/prettier"
  ],
  "rules": {
    "@typescript-eslint/class-literal-property-style": "off",
    "@typescript-eslint/consistent-indexed-object-style": "off",
    "@typescript-eslint/no-dynamic-delete": "off",
    "@typescript-eslint/no-empty-interface": "off",
    "@typescript-eslint/no-extraneous-class": "off",
    "@typescript-eslint/no-shadow": "off",
    "@typescript-eslint/no-unused-expressions": "off",
    "@typescript-eslint/prefer-optional-chain": "off",
    "no-only-tests/no-only-tests": "error",
    "simple-import-sort/imports": [
      "error",
      {
        "groups": [
          [
            // Side-effects group
            "^\\u0000",
            // External group
            "^",
            // Vaadin group
            "^@vaadin",
            // Parent group
            "^\\.\\.",
            // Sibling group
            "^\\."
          ]
        ]
      }
    ],
    "arrow-body-style": "off",
    "class-methods-use-this": "off",
    "consistent-return": "off",
    "func-names": "off",
    "max-depth": "off",
    "max-params": "off",
    "no-await-in-loop": "off",
    "no-bitwise": "off",
    "no-multi-assign": "off",
    "no-param-reassign": "off",
    "no-shadow": "off",
    "no-unused-vars": "off",
    "no-use-before-define": "off",
    "one-var": "off",
    "prefer-destructuring": "off",
    "prefer-object-has-own": "off",
    "prefer-promise-reject-errors": "off",
    "radix": "off",
    "sort-keys": "off"
  },
  "overrides": [
    {
      // Prevent using optional-chaining in source files, as it is not supported by Polymer analyzer
      "files": ["packages/*/src/**/*.js"],
      "rules": {
        "es/no-optional-chaining": "error"
      }
    },
    {
      "files": ["scripts/**/*.js", "*.js"],
      "rules": {
        "@typescript-eslint/no-require-imports": "off",
        "no-console": "off"
      }
    },
    {
      "files": ["packages/**/test/**", "integration/tests/**"],
      "env": {
        "mocha": true
      },
      "rules": {
        "no-await-in-loop": "off",
        "max-classes-per-file": "off",
        "simple-import-sort/imports": [
          "error",
          {
            "groups": [
              [
                // Testing tools group
                "^(@esm-bundle|@web|@vaadin/testing-helpers|sinon)",
                // Side-effects group
                "^\\u0000",
                // External group
                "^",
                // Vaadin group
                "^@vaadin",
                // Parent group
                "^\\.\\.",
                // Sibling group
                "^\\."
              ]
            ]
          }
        ]
      }
    }
  ]
}