What is the best approach to creating customizable modules in Angular2?

I'm exploring the most effective approach to configuring modules in Angular 2. In Angular 1, this was typically achieved through providers. As providers have been altered significantly, what is the preferred method for passing configuration parameters to reusable ng2 modules, directives, and components?

An example from Angular 1 can be found here:

// Configuring a (third party) module    
.config(function (angularPromiseButtonsProvider) {
  angularPromiseButtonsProvider.extendConfig({
    spinnerTpl: '<div class="other-class"></span>',
    disableBtn: false
  });
});

 // Setting up the provider
.provider('angularPromiseButtons', function angularPromiseButtonsProvider() {
    var config = {
        spinnerTpl: '<span class="btn-spinner"></span>',
        priority: 0,
        disableBtn: true,
    };

    return {
        extendConfig: function(newConfig) {
            config = angular.extend(config, newConfig);
        },

        $get: function() {
            return {
                config: config
            };
        }
    };
})

// Utilizing the result in the directive, etc.
.directive('promiseBtn', function(angularPromiseButtons){
    var config = angularPromiseButtons.config;
})

This question parallels this one but focuses on Angular 2.

Answer №1

Multiple recipes are available, either used individually or in combination.

Service Configuration

It is highly recommended to have a service that supplies essential configuration in key/value pairs.

An application entity may require more than one configuration service for setup. For example, someConfig can hold user-defined configurations, while someDefaultConfig contains default values that are editable. This can be accomplished by merging configuration objects using Object.assign.

Essential Configuration Service

This recipe emphasizes the need for users to explicitly define a configuration service, ensuring proper module functionality through Dependency Injection (DI).

AngularJS

// Third-party module
// Requires user-defined someConfig else will fail
angular.module('some', []).factory('someService', (someConfig) => { ... })

// User's module
angular.module('app', ['some']).constant('someConfig', { foo: 'foo' });
...

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