multiple websockets being opened when using HMR

[JoeMattie]

Including multiple packs in a page like:
= javascript_packs_with_chunks_tag 'app', 'project', 'other'

results in three websockets being opened, and the updated chunk being downloaded three times any time an edit is made. Additionally, console show multiple copies of [HMR] Waiting for update signal from WDS... with no connected message. However, HMR is working

What am I doing wrong?

[jakeNiemiec]

Each pack comes with separate embedded webpack runtimes. Please follow the code splitting docs in order to split your packs into chunks.

I give a good example in this comment: #1835 (comment)