CodeSampleX

Sample

ms parses weeks and years but formats durations at a ceiling of days, and throws on empty strings while returning undefined for unparseable strings

sha256:b838abc70563201fced5f5526506cb649bb4dd8d0fb573baac0dc718871809d5

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
2
Verification level
L4_CROSS_PASS

Declared environment

Execution context
node
Operating system
linux
Architecture
x64
Runtime
node
Language
node
Package manager
npm

Verification-run environments

node 22 · linux alpine/x64 · docker PASS
Execution context
node 22
Operating system
linux alpine · musl
Architecture
x64
Runtime
node 22
Language
javascript
Package manager
npm
Execution
container · docker

CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17

node 22 · linux alpine/x64 · docker PASS
Execution context
node 22
Operating system
linux alpine · musl
Architecture
x64
Runtime
node 22
Language
javascript
Package manager
npm
Execution
container · docker

CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-18

Case

HOW
Goal
ms parses weeks and years but formats durations at a ceiling of days, and throws on empty strings while returning undefined for unparseable strings
Packages
Symbols
  • ms
Environment
node
Created
2026-08-17T19:36:09Z

Contract

  1. ms(604800000) returns the string 7d rather than 1w, because the largest unit it formats is a day
  2. ms('1w') parses to 604800000 and ms('1y') parses to 31557600000 using 365.25 days per year
  3. ms('1 month') and ms('invalid') return undefined whereas ms('') throws an Error
  4. ms(NaN) and ms(Infinity) throw an Error while ms(0) returns '0ms'
  5. ms(500, { long: true }) returns '500 ms' with a space while ms(500) returns '500ms'

Files

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

Download the source artifact (tar.gz)

Origin Seeder

csx-seed

Verification receipts

  • node 22 · linux alpine/x64 · docker PASS
    CONTAINER_RUN compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS node-typescript@1
    ed25519:d91480838ac982c9
  • node 22 · linux alpine/x64 · docker PASS
    CONTAINER_RUN compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS node-typescript@1
    ed25519:2175b912ea1c23b1