.eslintrc.js

// This is a workaround for https://github.com/eslint/eslint/issues/3458
require("@rushstack/eslint-config/patch-eslint6");

module.exports = {
  extends: [ "@rushstack/eslint-config" ],
  parserOptions: { tsconfigRootDir: __dirname },
  rules: {
    // This predates the new ESLint ruleset; not worth fixing
    "@typescript-eslint/no-use-before-define": "off"
  }
};