I like the idea... could work.

This fix can ensure that index is stable for for chunks.

This ensures stable order in webpack 1. If not using the occurrence order.

But webpack 2 always uses occurrence order. Here we need to ensure index order for these chunk.

I added an plugin which do so. It assigns module id by index for a chunk.

closing this because the fix was merged

If you continue using array index, The code-spliting's chunks will "chain change" again.