Google Open Source on Mythryl: “The best open source tool for the job doesn't have to be built…”

The best open source tool for the job doesn't have to be built in-house. When evaluating Python type checkers, Google chose @pyrefly.org—originally built at Meta—and started contributing upstream alongside the community. Read our journey: goo.gle/pyrefly-at-g...

goo.glegoo.gleLearn why Google adopted Meta's open source Pyrefly type checker, reducing Python incremental rebuild latencies by up to 98% in our monorepo.

6/10/26, 6:35 pm2 reposts7 likes

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