@ngx-config/core

Configuration utility for Angular

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@ngx-config/core uses APP_INITIALIZER which executes a function when Angular app is initialized, and delay the completion of initialization process until application settings have been provided.

Table of contents:

• Getting started
  • Installation - Examples - Related packages - Recommended packages - Adding @ngx-config/core to your project (SystemJS)
  • app.module configuration
• Settings - Setting up ConfigModule to use ConfigStaticLoader - Setting up ConfigModule to use ConfigHttpLoader - Setting up ConfigModule to use ConfigMergeLoader
• Usage
• Pipe
• License

Getting started

Installation

You can install @ngx-config/core using npm

npm install @ngx-config/core --save

Examples

• ng-seed/universal and fulls1z3/example-app are officially maintained projects, showcasing common patterns and best practices for @ngx-config/core.

Related packages

The following packages may be used in conjunction with @ngx-config/core:

• @ngx-config/http-loader
• @ngx-config/merge-loader
• @ngx-i18n-router/config-loader

Recommended packages

The following package(s) have no dependency for @ngx-config/core, however may provide supplementary/shorthand functionality:

• @ngx-cache/core: provides caching features to retrieve the application settings using non-static loaders (@ngx-config/http-loader, @ngx-i18n-router/config-loader).

Adding @ngx-config/core to your project (SystemJS)

Add map for @ngx-config/core in your systemjs.config

'@ngx-config/core': 'node_modules/@ngx-config/core/bundles/core.umd.min.js'

app.module configuration

Import ConfigModule using the mapping '@ngx-config/core' and append ConfigModule.forRoot({...}) within the imports property of app.module (considering the app.module is the core module in Angular application).

Settings

You can call the forRoot static method using ConfigStaticLoader. By default, it is configured to have no settings.

You can customize this behavior (and ofc other settings) by supplying application settings to ConfigStaticLoader.

The following examples show the use of an exported function (instead of an inline function) for AoT compilation.

Setting up ConfigModule to use ConfigStaticLoader

...
import { ConfigModule, ConfigLoader, ConfigStaticLoader } from '@ngx-config/core';
...

export function configFactory(): ConfigLoader {
  return new ConfigStaticLoader({
    "system": {
      "applicationName": "Mighty Mouse",
      "applicationUrl": "http://localhost:8000"
    },
    "seo": {
      "pageTitle": "Tweeting bird"
    },
    "i18n":{
      "locale": "en"
    }
  });
}

@NgModule({
  declarations: [
    AppComponent,
    ...
  ],
  ...
  imports: [
    ConfigModule.forRoot({
      provide: ConfigLoader,
      useFactory: (configFactory)
    }),
    ...
  ],
  ...
  bootstrap: [AppComponent]
})

ConfigStaticLoader has one parameter:

• providedSettings: any : application settings

:+1: Cool! @ngx-config/core will retrieve application settings before Angular initializes the app.

Setting up ConfigModule to use ConfigHttpLoader

If you provide application settings using a JSON file or an API, you can call the forRoot static method using the ConfigHttpLoader. By default, it is configured to retrieve application settings from the endpoint /config.json (if not specified).

You can customize this behavior (and ofc other settings) by supplying a api endpoint to ConfigHttpLoader.

You can find detailed information about the usage guidelines for the ConfigHttpLoader here.

Setting up ConfigModule to use ConfigMergeLoader

ConfigMergeLoader provides application settings by executing loaders in parallel and in series.

You can find detailed information about the usage guidelines for the ConfigMergeLoader here.

Usage

ConfigService has the getSettings method, which you can fetch settings loaded during application initialization.

When the getSettings method is invoked without parameters, it returns entire application configuration. However, the getSettings method can be invoked using two optional parameters: key and defaultValue.

To specify returning value type you can add generic type in getSettings.

The following example shows how to read configuration settings using all available overloads of getSettings method.

anyclass.ts

...
import { ConfigService } from '@ngx-config/core';

@Injectable()
export class AnyClass {
  constructor(private readonly config: ConfigService) {
    // note that ConfigService is injected into a private property of AnyClass
  }

  myMethodToGetUrl1a() {
    // will retrieve 'http://localhost:8000'
    const url = this.config.getSettings<string>('system.applicationUrl');
  }

  myMethodToGetUrl1b() {
    // will retrieve 'http://localhost:8000'
    const url = this.config.getSettings<string>(['system', 'applicationUrl']);
  }

  myMethodToGetUrl2a() {
    // will retrieve 'http://localhost:8000'
    const url = this.config.getSettings<string>('system').applicationUrl;
  }

  myMethodToGetUrl2b() {
    // will retrieve 'http://localhost:8000'
    const url = this.config.getSettings<string>().system.applicationUrl;
  }

  myMethodToGetUrl3a() {
    // will throw an exception (system.non_existing is not in the application settings)
    const url = this.config.getSettings<string>('system.non_existing');
  }

  myMethodToGetUrl3b() {
    // will retrieve 'no data' (system.non_existing is not in the application settings)
    const url = this.config.getSettings<string>('system.non_existing', 'no data');
  }

  myMethodToGetSeo1() {
    // will retrieve {"pageTitle":"Tweeting bird"}
    const seoSettings = this.config.getSettings<string>('seo');
  }

  myMethodToGetSeo1() {
    // will retrieve {"pageTitle":"Tweeting bird"}
    const seoSettings = this.config.getSettings<string>().seo;
  }
}

Pipe

ConfigPipe is used to get the application settings on the view level. Pipe can be appended to a string or to an Array.

<span id="property">{{'some.setting' | config}}</span>
<span id="property">{{['some', 'setting'] | config}}</span>

In order to use this pipe in lazy-loaded modules, you must import ConfigModule.forChild().

License

The MIT License (MIT)

Copyright (c) 2019 Burak Tasci