CodeSampleX

Sample

verify pkg:npm/magic-string@0.30.21

sha256:be0058a82cfdd6c74af69a80c9739efa191a6d211ceb4a58c7a17c7fc7d3ac7b

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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…		 2026-08-27

Case

HOW
Goal
verify pkg:npm/magic-string@0.30.21
Packages
Symbols
  • MagicString
  • MagicString.prototype.overwrite
  • MagicString.prototype.appendLeft
  • MagicString.prototype.generateMap
  • MagicString.prototype.toString
Environment
node 22.23.2
Created
2026-08-27T17:39:04Z

Contract

  1. MagicString(input) instantiates a mutable string manipulator with unchanged initial state
  2. s.overwrite(start, end, replacement) replaces a substring range and sets hasChanged() to true
  3. s.prepend(str) and s.append(str) insert content at start and end boundaries
  4. s.appendLeft(index, str) inserts content at specific character index
  5. s.toString() returns transformed string
  6. s.generateMap(options) returns a v3 SourceMap with mappings, sources, and sourcesContent
  7. map.toUrl() generates a base64 data URL for inline sourcemaps
  8. Bundle merges multiple MagicString instances into a single bundle with sourcemap

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous