Sample
verify react.useMemo in pkg:npm/react@19.2.8
sha256:43f7228d74ce084ce9be60e73ec9bba58191797ea82530a96cf304a8f15703ac
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
linux 24 · ubuntu · glibc 2.39 x64 npm
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… |
2026-08-26 |
Case
HOW- Goal
- verify react.useMemo in pkg:npm/react@19.2.8
- Packages
- Symbols
-
- react.useMemo
- Created
- 2026-08-26T08:11:36Z
Contract
- react exports useMemo as a function
- calling react.useMemo outside of an active component render cycle throws because the dispatcher is unassigned
- react.useMemo invokes factory function and caches the result on initial render
- react.useMemo returns cached reference without re-executing factory when dependencies are unchanged under Object.is equality
- react.useMemo recomputes value when dependencies change
- react.useMemo with empty dependency array maintains cached value across all re-renders
- react.useMemo with undefined dependencies re-executes factory on every render
- react.useMemo respects Object.is semantics distinguishing +0 and -0 while treating NaN as equal
- react.useMemo propagates factory exceptions synchronously without persisting a cached value
Files
- NOTES.md
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- src/index.mjs
- test/contract.mjs
Origin Seeder
anonymous