Introduction
September 13, 2025
This is the starting point of a technical journey where I reverse-engineer parts of Facebook’s internal React build. The goal is not just curiosity—it’s about learning how a product at Facebook’s scale manages performance, developer experience, and advanced UI needs.
What This Series Is About
The series will cover three main areas:
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Hooks & Utilities – exploring custom hooks, caches, and state management helpers that are not documented in the public React API.
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Events & Scheduling – analyzing how Facebook integrates custom events and priority scheduling to ensure smooth interactions across complex surfaces.
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UI Approaches – showing how these internals influence the way Facebook builds interfaces:
<FDSButton />,<FDSText />,<FDSButton />,<FDSTooltip>, …