Using TypeScript to replace a current data type

Looking for a solution to implement a wrapper above the $http service in an AngularJS project. The goal is to have request promises with an abort() method.

Attempting to achieve this by creating the following function:

function request(params:ng.IRequestConfig):my.IRequestPromise {
  var promise = $http(params).then(onSuccess, onError);
  promise.abort = function () { // => here it fails with error "Property 'abort' does not exist on type 'IPromise<{}>'"
    ...
  }
  return promise;
}

Encountering an issue with TypeScript where it fails on the line defining abort.

A custom interface called IRequestPromise has been created which extends ng.IPromise by adding an abort() method. How can I instruct TypeScript to recognize promise as my.IRequestPromise instead of ng.IPromise?

javascriptangularjstypescript

Answer №1

If you want to assign the type of promise returned to a specific type extended from another type, you can do so by casting it:

For example,

var promise = <my.IRequestPromise<yourreturntype>>$http(params).then(onSuccess, onError);

Assuming your extension looks like this:

export interface IRequestPromise<T> extends ng.IPromise<T> {
    ...
}

Make sure that the return type of your function is correctly typed as well, for instance:

function request(params:ng.IRequestConfig):my.IRequestPromise<anyOrSpecificTypeResolvedByPromise> {

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