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react/scripts
Lauren Tan 85773456e7 [ci] Add size-balanced test sequencer for better shard distribution
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.
2026-01-06 18:08:07 -08:00
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