.eslintrc

{
  "env": {
    "node": true,
    "commonjs": true,
    "es6": true
  },
  "plugins": ["jest", "prettier", "@typescript-eslint"],
  "parser": "@typescript-eslint/parser",
  "extends": [
    "plugin:@typescript-eslint/recommended",
    "eslint:recommended",
    "plugin:jest/recommended",
    "prettier"
  ],
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "rules": {
    "semi": ["error", "always"],
    "quotes": ["error", "double"],
    "prettier/prettier": "error",
    // use @typescript-eslint/no-unused-vars
    "no-use-before-define": "off",
    "no-unused-vars": "off",
    "no-var": "error",
    "allow-namespace": "off",
    "@typescript-eslint/no-inferrable-types": [
      "warn",
      {
        "ignoreParameters": true
      }
    ],
    "@typescript-eslint/no-unused-vars": [
      "error",
      {
        "argsIgnorePattern": "^_"
      }
    ]
  }
}