Sample
jest 30.4.2: In Jest 30, toEqual and toStrictEqual exclude non-enumerable properties and non-enumerable symbols from deep equality comparisons by default, treating objects with divergent non-enumerable fields as equal.
Verified sample for npm jest 30.4.2: In Jest 30, toEqual and toStrictEqual exclude non-enumerable properties and non-enumerable symbols from deep equality…
sha256:32dfbf887b02186f34d852cc7289cb9167a32ee6cc53cf74a8ec3b20c4ad3b88
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 |
2026-08-17 |
| 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
- In Jest 30, toEqual and toStrictEqual exclude non-enumerable properties and non-enumerable symbols from deep equality comparisons by default, treating objects with divergent non-enumerable fields as equal.
- Packages
- Symbols
-
- expect.toEqual
- expect.toStrictEqual
- Environment
- node
- Created
- 2026-08-17T01:56:53Z
Contract
- expect(received).toEqual(expected) and expect(received).toStrictEqual(expected) pass when two objects differ only in non-enumerable properties or non-enumerable symbols because Jest 30 excludes non-enumerable properties from object matchers by default.
- Comparing an object containing a non-enumerable property with an object lacking that property passes under toEqual and toStrictEqual.
- expect.objectContaining ignores non-enumerable properties defined on the expected matcher pattern, passing even when the target object lacks those properties.
- expect(received).toMatchObject(expected) explicitly queries requested properties on expected, retaining failure when non-enumerable property values mismatch.
- Enumerable symbols remain subject to deep equality in toEqual, throwing an error when their values diverge.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs