tsconfig.json

{
  "compilerOptions": {
    "lib": ["dom", "es6", "es2017", "esnext.asynciterable"],
    "target": "es2015",
    "skipLibCheck": true,
    "sourceMap": false,
    "declaration": true,
    "declarationDir": "types",
    "moduleResolution": "node",
    "removeComments": true,
    "noImplicitAny": false,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "allowSyntheticDefaultImports": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true
  },
  "exclude": ["node_modules"]
}