.eslintrc.json

{
    "root": true,
    "extends": [
        "standard",
        "plugin:prettier/recommended"
    ],
    "parser": "@typescript-eslint/parser",
    "plugins": ["@typescript-eslint"],
    "rules": {
      "semi": ["error", "always"],
      "no-var": "error",
      "no-unused-vars": "off",
      "guard-for-in": "error",
      "@typescript-eslint/no-unused-vars": ["error", {
        "vars": "all",
        "args": "after-used",
        "ignoreRestSiblings": true,
        "argsIgnorePattern": "^_"
      }],
      "prefer-const": ["error", {
        "destructuring": "all"
      }],
      "standard/no-callback-literal": "off"
    },
    "parserOptions": {
      "ecmaVersion": 6,
      "sourceType": "module"
    },
    "overrides": [
      {
        "files": "*.ts",
        "rules": {
          "no-undef": "off",
          "no-redeclare": "off",
          "@typescript-eslint/no-redeclare": ["error"],
          "no-use-before-define": "off",
          "guard-for-in": "off"
        }
      },
      {
        "files": "*.d.ts",
        "rules": {
          "no-useless-constructor": "off",
          "@typescript-eslint/no-unused-vars": "off"
        }
      }
    ]
  }