SMRTR ProgrammingApr 16, 2025Daily.dev

Migrating 3.7 Million Lines of Flow Code to TypeScript

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Pinterest migrated 3.7 million lines of code from Flow to TypeScript in eight months, improving type safety, developer experience, and hiring. The migration involved a three-phase process: setup, conversion, and integration, using automated tools and manual fixes to ensure a smooth transition with minimal disruption to developers.

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