React

This is the React monorepo — the canonical source code for React, React DOM, React Server Components (Flight), the React Compiler, and the Scheduler. It contains the complete implementation of React's fiber reconciler, concurrent rendering, streaming SSR (Fizz), the RSC wire protocol, and an optimizing compiler (babel-plugin-react-compiler) that automatically memoizes React components and hooks.

Tech Stack

ReactTypeScriptJestExpress.jsNext.jsTailwind CSSZod

Key Features

Fiber Reconciler
React Public API & Hooks
React DOM & Event System
Fizz Streaming SSR
React Server Components (Flight Protocol)
RSC Bundler Integrations
Cooperative Task Scheduler
React Compiler (babel-plugin-react-compiler)
Compiler HIR & SSA Pipeline
Compiler Validation Passes
Feature Flags & Multi-Channel Releases
DevTools Build & Release Automation

Coding Conventions

Standards and patterns used in this codebase

naming

File naming uses: kebab-case, camelCase, PascalCase (for components/classes)

ReactVersions.js, babel.config-react-compiler.js, babel.config.js, dangerfile.js, anonymize.js

ReactVersions.jsbabel.config-react-compiler.jsbabel.config.js

configuration

Configuration is centralized in config files

Config files: babel.config-react-compiler.js, babel.config.js

babel.config-react-compiler.jsbabel.config.jsscripts/devtools/configuration.js

file-organization

Standard project structure

Code is organized by feature/module

ReactVersions.jsbabel.config-react-compiler.jsbabel.config.js