CodeSampleX

Sample

verify pkg:npm/core-util-is@1.0.3

sha256:2a420e5371f607000bffbd1f5cf927e4be8a72a66df996e2b634704e5446689d

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-26

Case

HOW
Goal
verify pkg:npm/core-util-is@1.0.3
Packages
Symbols
  • isArray
  • isBoolean
  • isBuffer
  • isDate
  • isError
  • isFunction
  • isNull
  • isNullOrUndefined
  • isNumber
  • isObject
  • isPrimitive
  • isRegExp
  • isString
  • isSymbol
  • isUndefined
Created
2026-08-26T08:53:04Z

Contract

  1. isArray returns true for arrays and false for non-arrays
  2. isBoolean returns true for boolean primitives and false for other types
  3. isBuffer returns true for Buffer instances and false for non-buffers
  4. isDate returns true for Date instances and false for non-dates
  5. isError returns true for Error instances and false for non-errors
  6. isFunction returns true for functions and false for non-functions
  7. isNull returns true only for null
  8. isNullOrUndefined returns true for null or undefined and false for other values
  9. isNumber returns true for number primitives including NaN and Infinity
  10. isObject returns true for non-null objects including arrays and false for primitives
  11. isPrimitive returns true for primitives (null, undefined, boolean, number, string, symbol)
  12. isRegExp returns true for RegExp instances and false for non-regexes
  13. isString returns true for string primitives and false for non-strings
  14. isSymbol returns true for symbols and false for non-symbols
  15. isUndefined returns true only for undefined

Files

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

Download the source artifact (tar.gz)

Origin Seeder

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