CodeSampleX

Sample

builder-util 26.15.3: target architecture mapping and KSUID generation with builder-util

Verified sample for npm builder-util 26.15.3: target architecture mapping and KSUID generation with builder-util. The contract ran on node 22 · linux…

sha256:d4b6e66a5095f4150f658e69f17d8c0107cd9404e5f9b30c4372490f8eeb618c

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

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
target architecture mapping and KSUID generation with builder-util
Packages
Symbols
  • Arch
  • archFromString
  • generateKsuid
  • getArchSuffix
  • toLinuxArchString
Environment
node 22.23.2
Created
2026-08-26T09:15:19Z

Contract

  1. assert Arch enum and archFromString map architecture strings to numeric enum values
  2. assert getArchSuffix returns empty string for default x64 and hyphenated suffix for arm64
  3. assert toLinuxArchString formats architecture names according to package target format
  4. assert generateKsuid generates a 27-character base62 unique identifier

Files

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

Download the source artifact (tar.gz)

Source

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: target architecture mapping and KSUID generation with builder-util
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/builder-util@26.15.3
Demonstrate these symbols/APIs:
  - Arch
  - archFromString
  - generateKsuid
  - getArchSuffix
  - toLinuxArchString

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:09d468d808c1892b8ecbcba6a77c72cd8ed21605ea7fc8126fbf646a2ec57a61","contract":["assert Arch enum and archFromString map architecture strings to numeric enum values","assert getArchSuffix returns empty string for default x64 and hyphenated suffix for arm64","assert toLinuxArchString formats architecture names according to package target format","assert generateKsuid generates a 27-character base62 unique identifier"],"goal":"target architecture mapping and KSUID generation with builder-util","kind":"HOW","packages":["pkg:npm/builder-util@26.15.3"],"schemaVersion":1,"symbols":["Arch","archFromString","generateKsuid","getArchSuffix","toLinuxArchString"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/builder-util@26.15.3"],"schemaVersion":1,"subject":"pkg:npm/builder-util@26.15.3","symbols":["Arch","archFromString","generateKsuid","getArchSuffix","toLinuxArchString"],"verifierAdapter":"node-typescript@1"}
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      "license": "WTFPL",
      "dependencies": {
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      "license": "(WTFPL OR MIT)"
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package.json
{
  "name": "sample-builder-util",
  "version": "1.0.0",
  "private": true,
  "dependencies": {
    "builder-util": "26.15.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "target architecture mapping and KSUID generation with builder-util",
  "kind": "HOW",
  "packages": [
    "pkg:npm/builder-util@26.15.3"
  ],
  "symbols": [
    "Arch",
    "archFromString",
    "generateKsuid",
    "getArchSuffix",
    "toLinuxArchString"
  ]
}
src/index.js
const {
  Arch,
  archFromString,
  getArchSuffix,
  toLinuxArchString,
  generateKsuid,
} = require("builder-util");

function resolveArch(archName) {
  return archFromString(archName);
}

function getArchitectureSuffix(arch, defaultArch) {
  return getArchSuffix(arch, defaultArch);
}

function getLinuxArchName(arch, target) {
  return toLinuxArchString(arch, target);
}

function createUniqueId() {
  return generateKsuid();
}

module.exports = {
  Arch,
  resolveArch,
  getArchitectureSuffix,
  getLinuxArchName,
  createUniqueId,
};
test/contract.js
const assert = require("node:assert");
const {
  Arch,
  archFromString,
  getArchSuffix,
  toLinuxArchString,
  generateKsuid,
} = require("builder-util");
const {
  resolveArch,
  getArchitectureSuffix,
  getLinuxArchName,
  createUniqueId,
} = require("../src/index.js");

// 1. Verify Arch enum and archFromString mapping
assert.strictEqual(Arch.ia32, 0, "Arch.ia32 must be 0");
assert.strictEqual(Arch.x64, 1, "Arch.x64 must be 1");
assert.strictEqual(Arch.armv7l, 2, "Arch.armv7l must be 2");
assert.strictEqual(Arch.arm64, 3, "Arch.arm64 must be 3");
assert.strictEqual(Arch.universal, 4, "Arch.universal must be 4");

assert.strictEqual(archFromString("x64"), Arch.x64);
assert.strictEqual(archFromString("arm64"), Arch.arm64);
assert.strictEqual(archFromString("ia32"), Arch.ia32);
assert.strictEqual(archFromString("armv7l"), Arch.armv7l);

assert.strictEqual(resolveArch("x64"), Arch.x64);
assert.strictEqual(resolveArch("arm64"), Arch.arm64);

// 2. Verify getArchSuffix formatting
assert.strictEqual(getArchSuffix(Arch.x64), "", "x64 should have empty suffix by default");
assert.strictEqual(getArchSuffix(Arch.arm64), "-arm64", "arm64 should have -arm64 suffix");
assert.strictEqual(getArchSuffix(Arch.ia32), "-ia32", "ia32 should have -ia32 suffix");
assert.strictEqual(getArchitectureSuffix(Arch.arm64), "-arm64");

// 3. Verify toLinuxArchString target conversions
assert.strictEqual(toLinuxArchString(Arch.x64, "deb"), "amd64", "x64 deb arch should be amd64");
assert.strictEqual(toLinuxArchString(Arch.arm64, "deb"), "arm64", "arm64 deb arch should be arm64");
assert.strictEqual(toLinuxArchString(Arch.arm64, "rpm"), "aarch64", "arm64 rpm arch should be aarch64");
assert.strictEqual(toLinuxArchString(Arch.armv7l, "deb"), "armhf", "armv7l deb arch should be armhf");
assert.strictEqual(toLinuxArchString(Arch.ia32, "deb"), "i386", "ia32 deb arch should be i386");
assert.strictEqual(getLinuxArchName(Arch.arm64, "rpm"), "aarch64");

// 4. Verify generateKsuid generation
const id1 = generateKsuid();
const id2 = createUniqueId();

assert.strictEqual(typeof id1, "string", "generateKsuid must return a string");
assert.strictEqual(id1.length, 27, "KSUID must be 27 characters long");
assert.match(id1, /^[0-9a-zA-Z]{27}$/, "KSUID must be alphanumeric base62");

assert.strictEqual(typeof id2, "string");
assert.strictEqual(id2.length, 27);
assert.notStrictEqual(id1, id2, "Consecutive KSUIDs should be distinct");

console.log("PASS: builder-util architecture and KSUID contract assertions verified");

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