CodeSampleX

Sample

verify pkg:npm/yaml@2.9.0

sha256:91b56f8f2b78adebfa2361c28ddddc88ec2e4680c2c26ef419a603aa23d877fe

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.parse
  • yaml.stringify
  • yaml.parseAllDocuments
  • yaml.LineCounter
  • yaml.Document
Created
2026-08-18T22:09:25Z

Contract

  1. assert yaml.parse parses standard YAML mapping and sequence structures into native JavaScript objects and arrays
  2. assert yaml.stringify serializes JavaScript objects into formatted YAML strings with configurable indentation
  3. assert yaml.parseAllDocuments parses multi-document YAML streams separated by triple hyphens into an array of Document ASTs
  4. assert yaml.LineCounter tracks line and column coordinates for byte offsets across source YAML content
  5. assert yaml.Document constructs a Document AST from JavaScript values and serializes to YAML via toString
  6. assert yaml.parse resolves YAML anchor and alias references into shared object references
  7. assert yaml.parse throws YAMLParseError on malformed YAML syntax

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