Sync React to Next.js

Use this skill when syncing a local React checkout into this Next.js checkout.

Build and sync

1. Build React from its own checkout. Pass this skill's script by its absolute
   path, because the working directory must be the React repository.

   cd <react-repo>
   bash <next-repo>/.agents/skills/react-sync/scripts/build-for-next.sh

   This creates build/oss-stable and build/oss-experimental with the
   bundle variants that Next.js consumes.

2. Sync the build into Next.js:

   cd <next-repo>
   PATH="$(dirname "$(command -v corepack)"):$PATH" \
     pnpm sync-react --version <react-repo>

   Work around a Codex PATH-precedence bug by keeping the directory containing
   the active Corepack shim first on PATH. Codex injects a separate bundled
   pnpm executable ahead of the user's Corepack shim, and command lookup
   happens before Corepack reads the repository's packageManager field. The
   prefix makes both this command and sync-react's nested pnpm install
   resolve through Corepack to the repository-pinned pnpm version. Invoking
   only the outer command with corepack pnpm is insufficient because the
   nested command still resolves pnpm from PATH.

3. Inspect the sync result before testing. Preserve unrelated changes in both
   checkouts. Rebuild Next.js when required, then run the focused test command
   matching the changed behavior.

Related Skills

• $react-vendoring - vendored React runtime and type boundaries after syncing.