CodeSampleX

Sample

verify pkg:npm/inherits@2.0.4

sha256:204301aab4e99b0f9ef7184d43fb686cfb97371e97c0420d355b7a8e0adec570

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

node 22 · linux alpine/x64 · docker PASS
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 · 2026-08-19

Case

HOW
Goal
verify pkg:npm/inherits@2.0.4
Packages
Symbols
  • inherits
Environment
node 22
Created
2026-08-18T18:20:03Z

Contract

  1. inherits establishes prototype inheritance between constructor functions so instances inherit methods from super constructor
  2. inherits sets the super_ property on the child constructor to reference the super constructor
  3. inherits maintains correct constructor reference on child prototype pointing back to child constructor
  4. instances of child constructor satisfy instanceof checks for both child and super constructor
  5. calling super constructor within child constructor properly initializes inherited own properties
  6. overriding methods on child prototype does not affect super constructor prototype methods
  7. multi-level prototype inheritance chains function correctly across generations

Files

  • PROMPT.md
  • csx.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.js

Download the source artifact (tar.gz)

Origin Seeder

anonymous

Verification receipts

  • node 22 · linux alpine/x64 · docker PASS
    CONTAINER_RUN compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS node-typescript@1
    ed25519:2175b912ea1c23b1