Pusher.ts

Pusher.ts

export type Receiver = (ctx: any, ...children: any[]) => any;
// type DynamicContextGenerator = (ctx: any, i: number) => any;

export class Pusher {
  ctx: any;
  receiver: Receiver;
  children: Pusher[];
  // getDynamicContext: DynamicContextGenerator = null;

  constructor(ctx: any, receiver: Receiver, ...children: Pusher[]) {
    this.ctx = ctx;
    this.receiver = receiver;
    this.children = children;
  }

  with(ctx) {
    Object.assign(this.ctx, ctx);
    return this;
  }

  //
  // Pushes `ctx` "down" to children
  //
  build(ctx = this.ctx) {
    ctx = Object.assign({}, ctx, this.ctx);
    const children = this.children.map((c /*, i*/) =>
      // this.getDynamicContext
      //   ? c.push(Object.assign({}, ctx, this.getDynamicContext(ctx, i)))
      // :
      c.build(ctx)
    );
    return this.receiver(ctx, ...children);
  }
  // setDynamicContextGenerator(fn: DynamicContextGenerator) {
  //   this.getDynamicContext = fn;
  //   return this;
  // }
}