14 lines
352 B
TypeScript
14 lines
352 B
TypeScript
interface IPromise<T> {
|
|
then<TResult>(successCallback: (promiseValue: T) => TResult, errorCallback?: (reason: any) => TResult): IPromise<TResult>;
|
|
}
|
|
|
|
var foo: IPromise<number>;
|
|
foo.then((x) => {
|
|
// x is inferred to be a number
|
|
return "asdf";
|
|
}).then((x) => {
|
|
// x is inferred to be string
|
|
x.length;
|
|
return 123;
|
|
});
|