返回promises的函数必须是异步的

Question

When I run tslint on my code I get the following error

functions that return promises must be async

Here is the code

private doSomething(): void {
    fetch(myUrl)
        .then((rsp: Response) => rsp.text()) // <-- gives error
        .then(txt => this.txt = txt);
}

Not sure now how to fix this because the code runs just fine! Any suggestions ?

Answer 1

This error message is caused by the tslint rule promise-function-async .

You can adhere to this rule by adding async on your arrow function expression:

.then(async (rsp: Response) => rsp.text())