code: function moveExtractedChunkBlocksToTargetChunk(chunks, targetChunk) {
    chunks.forEach(chunk => {
      if (chunk === targetChunk) {
        return
      }
      chunk.blocks.forEach(block => {
        // https://github.com/webpack/webpack/commit/7834e6cd570317d3e81c613b98c60defc85c1001
        if (block.chunks.indexOf(targetChunk) === -1) {
          block.chunks.unshift(targetChunk)
        }
        targetChunk.addBlock(block)
      })
    })
  }
docs: from CommonsChunkPlugin (async methods):