如何在Angular 2测试中对fixture.whenStable使用wait

Question

Though whenStable returns a promise, I'm not allowed to use await.

Below are my tsconfig

"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "es5",
"typeRoots": [
  "node_modules/@types"
],

I'm using "typescript": "^2.1.5"

Answer 1

As stated in the error message: 'await' is only allowed within async function. When you want to use await , you have to mark the outer function with async keyword.

// example

const myAsyncFunction = async () => {
   // ... some code
   await fixture.whenStable();
   // ... some code
}

When you mark any function with async keyword it returns a promise. Take a look at this question for better explanation of async/await.