exposes.ts

type LightFeatures = "state" | "brightness" | "color_temp" | "color_xy" | "color_hs";

interface Exposing {
  endpoint?: string;
  features: LightFeatures[] | string[];
}

class DeviceBuilder<T> {
  endpoint: string;
  features: Set<T>;
  constructor(endpoint: string = undefined) {
    this.endpoint = endpoint;
    this.features = new Set<T>();
  }

  build(): Exposing {
    const result: Exposing = {
      features: Array.from(this.features) as unknown as string[]
    };
    if (this.endpoint !== undefined) {
      result.endpoint = this.endpoint;
    }
    return result;
  }
}


class LightBuilder extends DeviceBuilder<LightFeatures> {
  withState() {
    this.features.add("state");
    return this;
  }
  withBrightness() {
    this.features.add("brightness");
    return this;
  }
  withColorTemp() {
    this.features.add("color_temp");
    return this;
  }
  withColorXY() {
    this.features.add("color_xy");
    return this;
  }
  withColorHS() {
    this.features.add("color_hs");
    return this;
  }
}

new LightBuilder().withBrightness().withColorHS().withState().build()