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React Vendoring
Use this skill for changes touching vendored React, react-server-dom-webpack/*, or react-server layer boundaries.
App Router Vendoring
React is NOT resolved from node_modules for App Router. It's vendored into packages/next/src/compiled/ during pnpm build (task: copy_vendor_react() in taskfile.js). Pages Router resolves React from node_modules normally.
Two channels: stable (compiled/react/) and experimental (compiled/react-experimental/). The runtime bundle webpack config aliases to the correct channel via makeAppAliases({ experimental }).
entry-base.ts Boundary
Only entry-base.ts is compiled in rspack's (react-server) layer. ALL imports from react-server-dom-webpack/* (Flight server/static APIs) must go through entry-base.ts. Other files like stream-ops.node.ts or app-render.tsx must access Flight APIs via the ComponentMod parameter (which is the entry-base.ts module exposed through the app-page.ts build template).
Direct imports from react-server-dom-webpack/server.node or react-server-dom-webpack/static in files outside entry-base.ts will fail at runtime with "The react-server condition must be enabled". Dev mode may mask this error, but production workers fail immediately.
Type Declarations
packages/next/types/$$compiled.internal.d.ts contains declare module blocks for vendored React packages. When adding new APIs (e.g. renderToPipeableStream, prerenderToNodeStream), you must add type declarations here. The bare specifier types (e.g. declare module 'react-server-dom-webpack/server') are what source code in src/ imports against.don't have the plugin yet? install it then click "run inline in claude" again.