@red6/ng-feature-flags

This library lets you manage features in the frontend using a semver notation. Inspired by angular-feature-toggle.

Installation

npm install @red6/ng-feature-flags --save

Configuration feature flags

@red6/ng-feature-flags uses a semver notation per feature and expects a configuration like this:

{
    feature1: "1.5.1",
    feature2: "0.5.6"
}

This configuration toggles features inside the code according to their version conditions.

//Example for "feature1" : "1.5.1"
//^1.0.0 - true
//~1.5.0 - true
//~1.6.0 - false
//^2 - false
//* - true

For more information regarding the semver notation head over to the semver and the node-semver sites.

Getting Started

After installing, include NgFeatureFlagsModule in your application module like:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { NgFeatureFlagsModule } from '@red6/ng-feature-flags';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [AppComponent],
  imports: [
    NgFeatureFlagsModule.forRoot({feature1: "1.5.1", feature2: "0.5.6"}),
    BrowserModule
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Toggle features using a directive

There are two directives you can use in order to toggle features: show-if-feature and hide-if-feature.
Basically they act as ng-if and the opposite of ng-if. They add/remove elements from the DOM if a feature is enabled or satisfies a certain version.

<!-- will  be shown if the admin feature is enabled -->
<div *showIfFeature="'admin'">
    This is the admin panel
</div>
<!-- will not be shown if the widget feature is enabled -->
<div *hideIfFeature="'widgets'">
    Widgets coming soon...
</div>

With a specific version:

<!-- will be shown if the admin feature exists and satisfies the version ^1 -->
<div *showIfFeature="admin ^1">
    This is the admin panel
</div>
<!-- will be shown if the admin feature exists and satisfies the version ~2.0.1 -->
<div *showIfFeature="admin ~2.0.1">
    This is the NEW and improved admin panel
</div>

Update features

To update features you can use the update methode on the service:

@Component({ ... })
class AppComponent {
  constructor(private featureFlagsService: FeatureFlagsService) {}

  updateFeature() {
    this.featureFlagsService.updateFeatures({ feature1: "2.0.0" });
  }
}