Method transferBodyChunk_

src/utils/dom-transform-stream.js:137–158

* Transfers available body elements in vsync cycle. * @return {!Promise}

()

   * @return {!Promise}
   */
  transferBodyChunk_() {
    if (this.currentChunkTransferPromise_) {
      return this.currentChunkTransferPromise_;
    }

    this.currentChunkTransferPromise_ = Promise.all([
      this.targetBodyPromise_,
      this.headPromise_,
    ]).then((resolvedElements) => {
      const transferThrottle = this.transferThrottle_;
      return transferThrottle(() => {
        this.currentChunkTransferPromise_ = null;
        const targetBody = resolvedElements[0];
        removeNoScriptElements(devAssertElement(this.detachedBody_));
        while (this.detachedBody_.firstChild) {
          targetBody.appendChild(this.detachedBody_.firstChild);
        }
      });
    });

    return this.currentChunkTransferPromise_;
  }
}