.eslintrc.json

{
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
      "ecmaVersion": 2018,
      "sourceType": "module"
    },
    "extends": [
      "plugin:@typescript-eslint/recommended",
      "prettier/@typescript-eslint",
      "plugin:prettier/recommended"
    ],
    "env": {
      "browser": true,
      "es6": true,
      "node": true,
      "mocha": true,
      "amd": true,
      "commonjs": true
    },
    "plugins": [
      "@typescript-eslint/eslint-plugin"
    ],
    "rules": {
      "prettier/prettier": ["error", {"printWidth": 120}],
      "max-len": ["error", {"code": 120, "ignorePattern": "^import\\s.+\\sfrom\\s.+;$", "ignoreStrings": true}],
      "no-unused-vars": "off",
      "@typescript-eslint/no-var-requires": "off",
      "@typescript-eslint/no-empty-function": ["error", { "allow": ["constructors"] }],
      "object-curly-spacing": ["error", "always"],
      "@typescript-eslint/explicit-function-return-type": "off"
    },
    "overrides": [
      {
        // enable the rule specifically for TypeScript files
        "files": ["*.ts", "*.tsx"],
        "rules": {
          "@typescript-eslint/explicit-function-return-type": ["error"]
        }
      }
    ]
  }