Adding Dependencies to a Static Factory in Typescript

Question

Adding Dependencies to a Static Factory in Typescript

I have developed a service in typescript as a Class. Within this class, I have defined a static Factory where dependencies are injected.

However, when I compress my application, the dependencies get compressed too, leading to an undefined provider error.

This is how my service looks like:

export class TInterceptor {    
public static $inject = ['$q', '$rootScope'];
public static Factory($q:ng.IQService, $rootScope:ng.IRootScopeService)
{
  return new TInterceptor($q, $rootScope);
}
constructor(private $q:ng.IQService, private $rootScope:ng.IRootScopeService){}...}

The service is called here:

  angular
    .module('t')
    .config(config);

  function config($httpProvider:ng.IHttpProvider)
  {
    $httpProvider.interceptors.push(TInterceptor.Factory);
  }

My concern is, how can I ensure that the dependencies remain protected from getting overwritten during code compression?

angularjs service dependency-injection typescript factory

Answer 1

Answer №1

To activate the factory, you must:

angular.module('myapp').factory('interceptorFactory', ['$q','$rootScope',TInterceptor.Factory]);

Add the factory name in the configuration block:

$httpProvider.interceptors.push('interceptorFactory');

You can also use an array instead (as it internally uses `$injector.invoke` and is not a string):

 $httpProvider.interceptors.push(['$q','$rootScope', TInterceptor.Factory]);

Don't forget to explicitly annotate the `config` block as well.

.config(['$httpProvider', config]);

Answer 2

To activate the factory, you must:

angular.module('myapp').factory('interceptorFactory', ['$q','$rootScope',TInterceptor.Factory]);

Add the factory name in the configuration block:

$httpProvider.interceptors.push('interceptorFactory');

You can also use an array instead (as it internally uses `$injector.invoke` and is not a string):

 $httpProvider.interceptors.push(['$q','$rootScope', TInterceptor.Factory]);

Don't forget to explicitly annotate the `config` block as well.

.config(['$httpProvider', config]);

Answer 3

Answer №2

UPDATE: Latest on Typescript 1.6

With the release of Typescript 1.6, supporting class expressions, you can now utilize a class expression with a closure for your injections:

angular.module('myApp')
    .factory('MyFactory', function($q, $http) {

        return class {

            constructor(data) {
                // Access to $q and $http here
            }
        }
    })

Typescript 1.5 Approach

Until version 1.6, Typescript does not allow class expressions. As an interim solution, I use the following syntax:

class MyClass {

    constructor(
        private $q: ng.IQService,
        private $http: ng.IHttpService,
        data) {

    }
}

I then apply the standard Angular factory definition, enabling the use of ng-annotate during build. I curate the class with factory injections before returning it:

angular.module('myApp')
    .factory('MyFactory', function($q, $http) {

        var factory = MyClass

        // Return curried MyClass
        return Function.prototype.bind.apply(factory,
            Array.prototype.concat.apply([factory], arguments))
    });

The return line can be simplified as:

return MyClass.bind(MyClass, $q, $http)

Although less readable, this approach avoids repetition when changing dependencies.

If you have Lodash or Underscore, a more elegant alternative is available:

return _.curry(MyClass).apply(this, arguments)

This enables instantiating the class by providing essential data only:

new MyFactory(data)

Answer 4

UPDATE: Latest on Typescript 1.6

With the release of Typescript 1.6, supporting class expressions, you can now utilize a class expression with a closure for your injections:

angular.module('myApp')
    .factory('MyFactory', function($q, $http) {

        return class {

            constructor(data) {
                // Access to $q and $http here
            }
        }
    })

Typescript 1.5 Approach

Until version 1.6, Typescript does not allow class expressions. As an interim solution, I use the following syntax:

class MyClass {

    constructor(
        private $q: ng.IQService,
        private $http: ng.IHttpService,
        data) {

    }
}

I then apply the standard Angular factory definition, enabling the use of ng-annotate during build. I curate the class with factory injections before returning it:

angular.module('myApp')
    .factory('MyFactory', function($q, $http) {

        var factory = MyClass

        // Return curried MyClass
        return Function.prototype.bind.apply(factory,
            Array.prototype.concat.apply([factory], arguments))
    });

The return line can be simplified as:

return MyClass.bind(MyClass, $q, $http)

Although less readable, this approach avoids repetition when changing dependencies.

If you have Lodash or Underscore, a more elegant alternative is available:

return _.curry(MyClass).apply(this, arguments)

This enables instantiating the class by providing essential data only:

new MyFactory(data)

Answer 5

Answer №3

There are two ways to define it:

1) Specify it in the config function

function configuration(){...}
configuration.$inject = ['$httpProvider'];

2) Define it while adding your function to the module

angular
  .module('t')
  .config(['$httpProvider', configuration]);

Answer 6

There are two ways to define it:

1) Specify it in the config function

function configuration(){...}
configuration.$inject = ['$httpProvider'];

2) Define it while adding your function to the module

angular
  .module('t')
  .config(['$httpProvider', configuration]);

Adding Dependencies to a Static Factory in Typescript

Answer №1

Answer №2

UPDATE: Latest on Typescript 1.6

Typescript 1.5 Approach

Answer №3

Similar questions

Although VSCode is functioning properly, there seems to be a discrepancy between the VSCode and the TS compiler, resulting in an

Customizing the Position of Material UI Select in a Theme Override

Angular filter that replaces underscores with spaces

Issue with CSS transition not displaying ng-show elements properly

Calculating numbers with Math.ceil will result in an increase of 1

Concluding the use of angular-bootstrap-datetimepicker when selecting a date

The function ValueChange remains uninvoked

The various types of Angular 2 FormBuilders

In what ways does PROJEN streamline project configuration for infrastructure and application projects?

Explore the world of data manipulation in Angular by experimenting with different

Dynamic URL used in TRPC queries`

Converting JSON into an interface in TypeScript and verifying its validity

Unleashing the power of TypeScript with Solid JS Abstract Class

After upgrading Expo, the React Native Auth Session ceased to function

Is there a way to silence TypeScript's complaints about a React rendered value being converted into a Date object?

Can you retrieve the Angular Service Instance beyond the scope of an angular component?

Extending Two Classes in Typescript: A Complete Guide

Dexie is alerting us to a problem with a call that occurs before initialization

Set up a personalized React component library with Material-UI integration by installing it as a private NPM package

Typescript in React is throwing an error that says you cannot destructure the property 'colored' from the 'boxShadows' object because it is undefined