.eslintrc

{
  "plugins": [
    "jest",
    "no-jquery"
  ],
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module"
  },
  "extends": [
    "eslint:recommended",
    "google",
    "plugin:jest/recommended",
    "plugin:no-jquery/all",
    "plugin:wc/recommended",
    "plugin:lit/recommended"
  ],
  "rules": {
    "arrow-parens": ["error", "as-needed"],
    "comma-dangle": ["error", {
        "arrays": "only-multiline",
        "objects": "only-multiline",
        "imports": "only-multiline",
        "exports": "only-multiline",
        "functions": "never"
    }],
    "indent": "off",
    "@typescript-eslint/indent": [
      "error",
      4,
      {
        "ignoredNodes": [
          "FunctionExpression > .params[decorators.length > 0]",
          "FunctionExpression > .params > :matches(Decorator, :not(:first-child))",
          "ClassBody.body > PropertyDefinition[decorators.length > 0] > .key",
          "TSTypeParameterInstantiation",
          "PropertyDefinition"
        ]
      }
    ],
    "max-len": ["warn", { "code": 100 }],
    "no-invalid-this": "warn",
    "no-param-reassign": ["error", { "props": false }],
    "object-curly-spacing": ["error", "always"],
    "quotes": ["error", "double", { "allowTemplateLiterals": true }],
    "require-jsdoc": "off",
    "valid-jsdoc": "off",
    "space-before-function-paren": [
      "error",
      { "anonymous": "always", "named": "never", "asyncArrow": "always" }
    ]
  },
  "env": {
    "browser": true,
    "es6": true,
    "jest/globals": true
  },
  "globals": {
    "d3": "readonly",
    "$": "readonly",
    "jQuery": "readonly",
    "I18n": "readonly",
    "dodona": "readonly"
  },
  "overrides": [
    {
      "extends": ["plugin:@typescript-eslint/recommended"],
      "files": ["*.ts"],
      "parser": "@typescript-eslint/parser",
      "parserOptions": {
        // this seems to be extremely slow
        // without 1.5s, with 22s
        //"project": "./tsconfig.json"
      },
      "plugins": ["@typescript-eslint"],
      "rules": {
        "@typescript-eslint/explicit-member-accessibility": "off",
        "@typescript-eslint/explicit-function-return-type": [
          "error",
          { "allowExpressions": true }
        ],
        "@typescript-eslint/no-parameter-properties": "off"
      }
    }
  ]
}