tsconfig.base.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "target": "es6",
    "declaration": true,
    "declarationMap": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "strict": true,
    "types": ["node"],
    "lib": ["es2017"]
  }
}