CodeSampleX

Sample

verify pkg:npm/yaml@2.9.0

sha256:2c86c0ab59d5d41f8708d524ff081327ffc6f3c1c565356f8b9608b9040e2ab5

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 linux 24 · ubuntu · glibc 2.39 x64 npm wsl

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-19

Case

HOW
Goal
verify pkg:npm/yaml@2.9.0
Packages
Symbols
  • yaml.Parser
  • yaml.Composer
  • yaml.CST
  • yaml.isDocument
  • yaml.isCollection
Created
2026-08-19T09:36:26Z

Contract

  1. assert yaml.Parser parses YAML text into CST tokens with token type and structure
  2. assert yaml.Composer composes CST tokens into Document AST instances and supports node lookup
  3. assert yaml.Parser and yaml.Composer parse and compose multi-document YAML streams into multiple Document instances
  4. assert yaml.CST.stringify serializes CST tokens back to YAML text directly
  5. assert yaml.isDocument type guard returns true for Document instances and false for non-Document nodes
  6. assert yaml.isCollection type guard returns true for collection AST nodes and false for scalar or primitive values

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous