Function push

src/utils/createEventStream.ts:11–16

(value: any)

      let pushValue: any | Promise<any> = new Promise(resolve => (pullControl = resolve));

      const push = (value: any) => {
        if (pullControl) {
          pullControl(value);
          pushValue = new Promise(resolve => (pullControl = resolve));
        }
      };

      source.addEventListener("output", e => {
        push(e);