Sample
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
sha256:d9b320028402b47b7ce4d57f7d1a0e00dbc8b5fbac297efcd2e6a408a4e6b230
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- 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 HOW
- Packages
- jest 29.7.0
- 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
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-15 · ed25519:d91480838ac982c9