Sample
jest 29.7.0: Jest requires Node VM modules (--experimental-vm-modules) and transform: {} to run real ESM, rejecting .js in extensionsToTreatAsEsm and failing top-level await and import.meta in default CJS pipeline
Verified sample for npm jest 29.7.0: Jest requires Node VM modules (--experimental-vm-modules) and transform: {} to run real ESM, rejecting .js in…
sha256:d9b320028402b47b7ce4d57f7d1a0e00dbc8b5fbac297efcd2e6a408a4e6b230
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 |
2026-08-15 |
| 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
- Jest requires Node VM modules (--experimental-vm-modules) and transform: {} to run real ESM, rejecting .js in extensionsToTreatAsEsm and failing top-level await and import.meta in default CJS pipeline
- Packages
- Symbols
-
- extensionsToTreatAsEsm
- transform
- unstable_shouldLoadAsEsm
- Environment
- node
- Created
- 2026-08-15T14:34:44Z
Contract
- assert validateExtensionsToTreatAsEsm rejects .js, .cjs, and .mjs
- assert unstable_shouldLoadAsEsm returns false without --experimental-vm-modules
- assert unstable_shouldLoadAsEsm returns true for .mjs and custom extensions with --experimental-vm-modules
- assert default CJS execution pipeline fails on top-level await and import.meta with SyntaxError
- assert Jest with --experimental-vm-modules and transform: {} successfully executes native ESM tests
Files
- NOTES.md
- csx.json
- fixtures/esm-feature.mjs
- fixtures/esm.test.mjs
- fixtures/jest.esm.config.json
- package-lock.json
- package.json
- test/contract.mjs