Sample
instrument JavaScript code using createInstrumenter and extract file coverage
sha256:bfa376c68822a758666e350b24a139ef117d54fc5964eed4400f7a406a2b1aca
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
- instrument JavaScript code using createInstrumenter and extract file coverage
- Packages
- Symbols
-
- createInstrumenter
- instrumentSync
- lastFileCoverage
- Created
- 2026-08-26T14:13:56Z
Contract
- assert createInstrumenter creates an instrumenter with instrumentSync, lastFileCoverage, and lastSourceMap methods
- assert instrumentSync transforms JavaScript source code to include coverage counters and initial metadata referencing coverageVariable
- assert lastFileCoverage returns FileCoverageData structure with statementMap, fnMap, branchMap, and initial zero counts
- assert lastSourceMap returns generated source map when produceSourceMap is enabled
- assert readInitialCoverage extracts initial file coverage metadata from instrumented code
- assert instrumentSync throws an error on invalid JavaScript syntax
- assert executing instrumented code in a JavaScript runtime VM records statement hit counts
Files
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- src/index.mjs
- test/contract.mjs
Origin Seeder
anonymous