TypeScript在Promise.then中编译错误

Question

I'm trying to use promises in typescript. I used tsd to install es6-promise and added the reference to my file. It understands promises for the most part, but I'm having difficulty chaining them with then .

function foo() : Promise<any> {
  var p: Promise<any> = Promise.resolve();
  var x: Promise<any> = Promise.resolve();
  p = p.then(x);
  return p;
}

gives me this at the location of p.then(x) :

error TS2345: Argument of type 'Promise' is not assignable to parameter of type '(value: any) => {} | Thenable<{}>'.

Is this somehow a bug in the type definition , or am I using it wrong?

Answer 1

p.then(x);

This is invalid. x needs to be function. Here you have it as a promise.