Sample
verify pkg:npm/hasown@2.0.4
sha256:c886ab294bb3afe864b94927cf821cc736b627449a5bc3a9ae3c326afa5e51dd
Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures.
Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments.
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
- Evidence basis
- Independent cross-verification
- Verification receipts
- 1
- Verification level
- L4_CROSS_PASS
Declared environment
- Execution context
- node 22
- Operating system
- linux
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm 10
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
Case
HOW- Goal
- verify pkg:npm/hasown@2.0.4
- Packages
- Symbols
-
- hasOwn
- Environment
- node 22
- Created
- 2026-08-18T17:58:24Z
Contract
- hasOwn returns true for direct own properties on plain objects including undefined and null values
- hasOwn returns false for inherited prototype properties like toString and valueOf
- hasOwn returns true for valid array indices and length property while returning false for out of bounds indices and array prototype methods
- hasOwn works correctly on objects created with Object.create(null) lacking Object prototype methods
- hasOwn correctly identifies properties on objects where hasOwnProperty is shadowed or overridden
- hasOwn returns true for properties with falsy values such as false, empty string, and zero
- hasOwn supports Symbol properties when Symbol is available in the environment
Files
- PROMPT.md
- csx.json
- index.js
- package-lock.json
- package.json
- spec.json
- test/contract.js
Origin Seeder
anonymous
Verification receipts
-
node 22 · linux alpine/x64 · docker PASSed25519:2175b912ea1c23b1