Feature Gating - check the gates

feature-gating-strategy.ts

export class Foo implements IFoo{
   constructor(private readonly barStrategy:()=>void){}
   public bar(){
       this.barStrategy();
   }
};

// composition root
const featureService:IFeatureService = new FeatureService(),
   strategy1 = ():void =>{ /*...strategy 1...*/ },
   strategy2 = ():void =>{ /*...strategy 2...*/ },
   barStrategy:()=>void = featureService.isEnabled("feature-x") ? strategy1 : strategy2,
   foo:IFoo = new Foo(barStrategy);