Sample
react 19.0.0: Handle React 19 silent defaultProps removal on function components and native ref prop passing
Verified sample for npm react 19.0.0: Handle React 19 silent defaultProps removal on function components and native ref prop passing. The contract ran on…
sha256:552ef5d3a70a3b9900979b25b8242bc2f67de724201eef3d5255996d2cbff54f
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
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-16 |
| node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
Case
HOW- Goal
- Handle React 19 silent defaultProps removal on function components and native ref prop passing
- Packages
- Symbols
-
- defaultProps
- ref
- jsx
- Environment
- node
- Created
- 2026-08-16T07:54:05Z
Contract
- FunctionComponent.defaultProps is ignored under React 19 jsx-runtime leaving props undefined
- ClassComponent.defaultProps continues to be resolved during React 19 rendering
- ES6 default parameters must be used for default prop values in React 19 function components
- Function components receive ref directly in props in React 19 without React.forwardRef
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs