CodeSampleX

Sample

verify pkg:npm/yaml@2.9.0

sha256:f54a5cfafcccb778c5b07564e221b6cb7dfd5b2946c2a828ffdc9f4e05e3c36b

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 node 22.22 linux 24 · ubuntu · glibc 2.39 x64 node 22.22 javascript npm 11 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.Lexer
Environment
node 22.22.2
Created
2026-08-19T11:56:39Z

Contract

  1. Lexer.lex tokenizes mapping keys, values, and delimiters into lexical token streams
  2. Lexer.lex tokenizes sequence indicators, item scalars, and indentation
  3. Lexer.lex tokenizes single-quoted and double-quoted scalar strings
  4. Lexer.lex tokenizes block literal and block folded scalar content
  5. Lexer.lex tokenizes document anchors, aliases, tags, and inline and block comments
  6. Lexer.lex tokenizes YAML directives and document boundary markers
  7. Lexer token streams feed Parser and Composer to construct Document AST instances
  8. Lexer.lex supports chunked streaming with incomplete parameter

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous