CodeSampleX

Sample

verify pkg:npm/yaml@2.9.0

sha256:3a2291f1b609ea76bd25f9899745d3ceba59dcb56b581d1c3feaea861e75a470

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.parseDocument
  • yaml.parseAllDocuments
  • yaml.LineCounter
  • yaml.Document
  • yaml.Scalar
  • yaml.YAMLMap
  • yaml.YAMLSeq
  • yaml.Pair
  • yaml.isNode
  • yaml.isScalar
  • yaml.isMap
  • yaml.isSeq
  • yaml.isPair
Created
2026-08-19T02:48:00Z

Contract

  1. assert yaml.parse parses standard YAML mappings, sequences, numbers, and booleans into native JavaScript types
  2. assert yaml.stringify formats JavaScript objects and arrays into valid YAML text with configurable options
  3. assert yaml.parseAllDocuments parses multi-document YAML streams separated by '---' into an array of Document ASTs
  4. assert yaml.LineCounter computes 1-indexed line and column positions for byte offsets across multi-line YAML input
  5. assert yaml.parseDocument produces a Document AST supporting AST node traversal, modification, and conversion via toJS
  6. assert yaml type guards isNode, isScalar, isMap, isSeq, and isPair correctly identify AST node kinds
  7. assert Document creates and serializes YAMLMap, YAMLSeq, Scalar, and Pair AST structures with preserved formatting and comments
  8. assert yaml.parse with merge: true resolves YAML 1.1 merge key << references into merged object fields
  9. 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