Sample
lodash.mergeWith applies customizer return values to override default property assignment while falling back to recursive deep merge when returning undefined
sha256:fbf4e7bf582a93245baffdb5a1571715f43c2a6407dfc0a34c5c54d1d7100679
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- node
- Operating system
- linux
- Architecture
- x64
- Runtime
- node
- Language
- node
- Package manager
- npm
Verification-run environments
- Execution context
- node 22
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17
Case
- Goal
- lodash.mergeWith applies customizer return values to override default property assignment while falling back to recursive deep merge when returning undefined HOW
- Packages
-
lodash 4.17.21
- Environment
- node
- Created
- 2026-08-17T12:17:14Z
Contract
- mergeWith uses the value returned by customizer when defined, but falls back to recursive deep merging when the customizer returns undefined.
- assert.deepStrictEqual(merge({}, { a: [1, 2] }, { a: [3] }), { a: [3, 2] })
- assert.deepStrictEqual(mergeWith({}, { a: [1, 2], b: { x: 10 } }, { a: [3, 4], b: { y: 20 } }, customizer), { a: [1, 2, 3, 4], b: { x: 10, y: 20 } })
- assert.strictEqual(mergeWith({ reset: { keep: true } }, { reset: { replace: true } }, () => null).reset, null)
- assert.strictEqual(mergeWith(dest, { count: 2 }, (obj, src) => obj + src), dest)
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9