.eslintrc.js

module.exports = {
  parser: "@typescript-eslint/parser",
  parserOptions: {
    ecmaVersion: 6,
    sourceType: "module",
    ecmaFeatures: {
      jsx: true,
    },
  },
  rules: {
    "no-var": "error",
    "no-case-declarations": "error",
    "no-fallthrough": "error",
  },
  ignorePatterns: ["test/data"],
};