.eslintrc.json

{
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "./tsconfig.json"
  },
  "env": {
    "node": true,
    "es2017": true
  },
  "plugins": ["jest", "@typescript-eslint"],
  "extends": [
    "eslint:recommended",
    "plugin:jest/recommended",
    "plugin:@typescript-eslint/recommended",
    "prettier",
    "prettier/@typescript-eslint"
  ],
  "rules": {
    "@typescript-eslint/explicit-function-return-type": "off",
    "@typescript-eslint/await-thenable": "error",
    "@typescript-eslint/no-require-imports": "error",
    "@typescript-eslint/no-unnecessary-type-assertion": "error",
    "@typescript-eslint/promise-function-async": "error",
    "@typescript-eslint/unbound-method": "error",
    "@typescript-eslint/explicit-module-boundary-types": "error"
  },
  "settings": {
    "import/resolver": {
      "node": {
        "extensions": [".ts"]
      }
    }
  }
}