Sample
react 18.3.1: startTransition executes its callback synchronously, returns undefined, and scopes the transition batch config exclusively to synchronous execution.
Verified sample for npm react 18.3.1: startTransition executes its callback synchronously, returns undefined, and scopes the transition batch config…
sha256:42584324b1a44d5a5ea2b27faf3c3895e201b0bc97e6791e7e97b81bd4439f5f
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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 |
2026-08-17 |
| 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
- startTransition executes its callback synchronously, returns undefined, and scopes the transition batch config exclusively to synchronous execution.
- Packages
- Symbols
-
- react.startTransition
- Environment
- node
- Created
- 2026-08-17T06:44:11Z
Contract
- startTransition executes its callback synchronously on the calling thread, returns undefined rather than a Promise, and resets ReactCurrentBatchConfig.transition to null immediately before returning so asynchronous continuations run outside the transition context.
- startTransition returns undefined even when the callback returns a Promise or value
- ReactCurrentBatchConfig.transition is an active object during synchronous callback execution and is restored to null upon return
- asynchronous work scheduled inside startTransition executes after the transition context has already been reset to null
- synchronous errors thrown inside startTransition propagate immediately while reliably restoring the previous transition context
- nested startTransition calls maintain and restore the enclosing transition batch configuration
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs