CodeSampleX

Sample

verify pkg:npm/yaml@2.9.0

sha256:5e23213c6a35d38c111198166f28e98ebdcc091bf79f220ed18514aa0d5ecbc6

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.YAMLMap
  • yaml.YAMLSeq
  • yaml.Pair
  • yaml.isMap
  • yaml.isSeq
  • yaml.isPair
  • yaml.isScalar
  • yaml.isNode
  • yaml.LineCounter
Created
2026-08-18T22:17:37Z

Contract

  1. assert YAMLMap constructs mapping AST nodes with key-value pairs, item lookup, deletion, and flow-style serialization
  2. assert YAMLSeq constructs sequence AST nodes with indexed element access, flow-style formatting, and serialization
  3. assert Pair constructs key-value AST nodes with key and value properties
  4. assert AST type guards isMap, isSeq, isPair, isScalar, and isNode accurately identify YAML AST node types
  5. assert LineCounter tracks line and column coordinates for character offsets in parsed YAML documents

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