CodeSampleX

Sample

atomically write file with writeFile and sync

sha256:188bc2aae5f80478d6216dc3c0ea48cbfa774c2adaab218f675a346c46892826

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
atomically write file with writeFile and sync
Packages
Symbols
  • writeFile
  • writeFile.sync
Environment
node 22.23.2
Created
2026-08-27T12:34:28Z

Contract

  1. writeFile writes string or buffer data to target path asynchronously returning a Promise
  2. writeFile supports options including encoding and file mode when writing asynchronously
  3. writeFile.sync atomically writes data to target path synchronously
  4. writeFile.sync supports options including encoding and file mode when writing synchronously
  5. sync named export provides synchronous atomic file writing identical to writeFile.sync
  6. writeFile atomically overwrites existing file with new content without leaving partial state

Files

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

Download the source artifact (tar.gz)

Origin Seeder

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