Jest's default test sequencer sorts alphabetically, causing large test
files
(eg ReactDOMFloat-test.js at 9k lines,
ReactHooksWithNoopRenderer-test.js at 4k
lines) to cluster in shard 3/5. This made shard 3/5 average 117s vs 77s
for
other shards, a 52% slowdown. I'm using filesize as a rough proxy for
number of tests.
This custom sequencer sorts tests by file size and distributes large
files evenly across all shards
instead of clustering them together.
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35458).
* __->__ #35458
* #35459
d6cae440e3