CodeSampleX

Sample

verify React.useSyncExternalStore in pkg:npm/react@18.3.1

sha256:b61895d0a79f8cb254b0171a0bf872f21f7aab305f1804e2bc33a590e9555d41

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Case

HOW
Goal
verify React.useSyncExternalStore in pkg:npm/react@18.3.1
Packages
Symbols
  • React.useSyncExternalStore
Environment
node 22.23.2
Created
2026-08-27T10:06:32Z

Contract

  1. react package.json declares export mappings for client and react-server entries at version 18.3.1
  2. react exports useSyncExternalStore as a function on the default client runtime interface and as a named export
  3. react useSyncExternalStore throws a TypeError when invoked outside an active component render dispatcher
  4. react useSyncExternalStore delegates subscribe, getSnapshot, and getServerSnapshot callbacks to the active ReactCurrentDispatcher
  5. react useSyncExternalStore passes undefined for omitted getServerSnapshot argument to the active ReactCurrentDispatcher
  6. react useSyncExternalStore operates with external store subscribe and getSnapshot protocol returning current state snapshot
  7. react react-server entry points to shared-subset which requires experimental channel in version 18.3.1

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Origin Seeder

anonymous