.eslintrc.js

module.exports = {
  root: true,
  parser: "@babel/eslint-parser",
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: "module",
    requireConfigFile: false,
  },
  plugins: ["no-unsanitized", "prettier"],
  extends: ["eslint:recommended", "plugin:no-unsanitized/DOM", "prettier"],
  rules: {
    semi: "warn",
    "no-console": "off",
    "no-shadow": "warn",
    "require-atomic-updates": "off",
  },
  env: {
    node: true,
    es6: true,
    browser: true,
    jasmine: true,
    jest: true,
  },
  overrides: [
    {
      files: ["**/*.ts", "**/*.tsx"],
      parser: "@typescript-eslint/parser",
      parserOptions: {
        ecmaVersion: 6,
        sourceType: "module",
        project: "./tsconfig.json",
      },
      plugins: ["@typescript-eslint", "no-unsanitized", "prettier"],
      extends: [
        "eslint:recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:no-unsanitized/DOM",
        "prettier",
      ],
      rules: {
        "@typescript-eslint/no-namespace": "off",
        "@typescript-eslint/explicit-member-accessibility": "off",
        // TODO no-explicit-any really should be enabled
        "@typescript-eslint/no-explicit-any": "off",
        "@typescript-eslint/array-type": ["error", { default: "array-simple" }],
        "@typescript-eslint/no-parameter-properties": "off",
        "@typescript-eslint/no-use-before-define": [
          "error",
          { functions: false, typedefs: false, variables: false },
        ],
        // TODO explicit-function-return-type really should be enabled
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/no-unused-vars": [
          "warn",
          {
            ignoreRestSiblings: true,
          },
        ],
        "@typescript-eslint/interface-name-prefix": "off",
        "@typescript-eslint/camelcase": "off",
        "@typescript-eslint/no-this-alias": "off",
        "@typescript-eslint/no-empty-function": "off",
        // TODO explicit-module-boundary-types should be enabled
        "@typescript-eslint/explicit-module-boundary-types": "off",

        // https://github.com/typescript-eslint/typescript-eslint/issues/60
        "no-redeclare": "off",
        "no-inner-declarations": "off",
        "no-dupe-class-members": "off",
      },
    },
  ],
};