What are the steps to customize the $http interface in AngularJS?

Within my application, I am making an $http call with the following code:

            $http({
                url: '/abc'
                method: "PUT",
                ignoreLoadingBar: true
            })

This $http call includes a custom parameter `ignoreLoadingBar` that is necessary for angular-loading-bar integration.

However, TypeScript flags this as an error because 'ignoreLoadingBar' is not part of the standard 'IRequestConfig' interface:

Severity    Code    Description Project File    Line
Error   TS2345  Argument of type '{ url: string; method: string; ignoreLoadingBar: boolean; }' is not assignable to parameter of type 'IRequestConfig'.
  Object literal may only specify known properties, and 'ignoreLoadingBar' does not exist in type 'IRequestConfig'.

To address this issue, I have created a new interface extending 'ng.IRequestConfig' to include the additional property:

interface IRequestConfigPlus extends ng.IRequestConfig {
  ignoreLoadingbar: boolean
}

My question now is how can I use `IRequestConfigPlus` to avoid TypeScript errors without modifying the AngularJS core interface directly?

Update:

I appreciate Basarat's suggestion, but I still need guidance on implementing `IRequestConfigPlus`. How can I effectively utilize this interface in my scenario?

Answer №1

I have found success with the following simple example:

///<reference path="typings/angularjs/angular.d.ts" />

let $http:ng.IHttpService = null;

declare module angular
{
    interface IRequestConfig {
        ignoreLoadingBar: boolean;
    }
}

$http({
    url: '/xyz',
    method: "POST",
    ignoreLoadingBar: true
});

Answer №2

Is there a way to prevent typescript errors when using $http?

The issue is due to object freshness: https://basarat.gitbooks.io/typescript/content/docs/types/freshness.html

Here is a quick workaround: (use an assertion)

        $http({
            url: '/abc'
            method: "PUT",
            ignoreLoadingBar: true
        } as ng.IRequestConfig)

A more effective solution

You can create a .d.ts file for angular-loading-bar that includes additional properties in the angular.IRequestConfig interface. Note: TypeScript interfaces are open ended

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