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Case Study: Migrating a Rush.js Monorepo to Node Type Stripping

1 sdotson 2 8/21/2025, 9:15:13 PM blog.calm.com ↗

Comments (2)

sdotson · 5h ago

We migrated Calm’s large Rush.js monorepo away from tsc emit and onto Node’s new type stripping feature. Key lessons:

ESM migration was a prerequisite (imports, JSON, CJS compat).

Biggest blocker: thousands of Sinon stubs (solution: “stub classes, not modules”).

Some CJS → ESM package refactors needed (lodash → lodash-es).

Results: local dev tasks ~30–40% faster, CI jobs ~3–6 minutes faster.

Full write-up: https://www.calm.com/blog/engineering/how-we-migrated-our-ru...

Curious if others have tried type stripping in Node 22/23 yet.

stefanos82 · 3h ago

Any chance to test your local development with Bun? This is their latest improvement and I can't wait to test it as soon as they release it! https://bun.com/blog/how-we-made-postMessage-string-500x-fas...