CodeSampleX

Sample

builder-util 25.1.7

Verified sample for npm builder-util 25.1.7. The contract ran on node 22 · linux alpine/x64 · docker and passed: archFromString maps valid architecture names…

sha256:d583f02a679a0b81d14f3e5416dcd509d30abae2cf843b433eaeb4b303127d17

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/builder-util@25.1.7
Packages
Environment
node 22.23.2
Created
2026-08-27T17:09:58Z

Contract

  1. archFromString maps valid architecture names to Arch enum values and throws for invalid architecture names
  2. toLinuxArchString formats architecture names according to package target type
  3. getArchSuffix returns empty string for default arch and hyphenated suffix for target arch
  4. getArtifactArchName maps architecture and target artifact extensions to distribution architecture names
  5. serializeToYaml serializes objects to YAML format string
  6. deepAssign performs deep property assignment and deduplicates merged arrays
  7. safeStringifyJson serializes objects to JSON while masking specified skipped keys
  8. isEmptyOrSpaces and isEnvTrue validate strings and evaluate boolean environment variable strings
  9. replaceDefault expands default placeholder with provided default list
  10. removePassword sanitizes password arguments in command strings with SHA-256 hashes
  11. InvalidConfigurationError constructs configuration error with message and error code

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: verify pkg:npm/builder-util@25.1.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/builder-util@25.1.7
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:828685aec300aa704e20acee4ca18edf5d9c9f14c535b92fdb89e6bf730c5fd1","constraints":{"executionContext":"node"},"contract":["archFromString maps valid architecture names to Arch enum values and throws for invalid architecture names","toLinuxArchString formats architecture names according to package target type","getArchSuffix returns empty string for default arch and hyphenated suffix for target arch","getArtifactArchName maps architecture and target artifact extensions to distribution architecture names","serializeToYaml serializes objects to YAML format string","deepAssign performs deep property assignment and deduplicates merged arrays","safeStringifyJson serializes objects to JSON while masking specified skipped keys","isEmptyOrSpaces and isEnvTrue validate strings and evaluate boolean environment variable strings","replaceDefault expands default placeholder with provided default list","removePassword sanitizes password arguments in command strings with SHA-256 hashes","InvalidConfigurationError constructs configuration error with message and error code"],"goal":"verify pkg:npm/builder-util@25.1.7","kind":"HOW","packages":["pkg:npm/builder-util@25.1.7"],"schemaVersion":1},"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","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/builder-util@25.1.7"],"schemaVersion":1,"subject":"pkg:npm/builder-util@25.1.7","verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-builder-util",
  "version": "1.0.0",
  "description": "verify pkg:npm/builder-util@25.1.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "builder-util": "25.1.7"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/builder-util@25.1.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/builder-util@25.1.7"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.js
'use strict';

const {
  Arch,
  archFromString,
  defaultArchFromString,
  toLinuxArchString,
  getArchSuffix,
  getArchCliNames,
  getArtifactArchName,
  serializeToYaml,
  deepAssign,
  safeStringifyJson,
  asArray,
  isEmptyOrSpaces,
  isEnvTrue,
  isTokenCharValid,
  replaceDefault,
  removePassword,
  getPlatformIconFileName,
  InvalidConfigurationError,
  ExecError
} = require('builder-util');

/**
 * Resolves an architecture string to its enum value.
 * @param {string} name
 * @returns {number}
 */
function resolveArch(name) {
  return archFromString(name);
}

/**
 * Formats a Linux architecture string for a given target.
 * @param {number} arch
 * @param {string} [targetName]
 * @returns {string}
 */
function formatLinuxArch(arch, targetName) {
  return toLinuxArchString(arch, targetName);
}

/**
 * Converts a JavaScript object to a YAML formatted string.
 * @param {object} obj
 * @param {boolean} [skipInvalid=false]
 * @param {boolean} [noRefs=false]
 * @returns {string}
 */
function dumpYaml(obj, skipInvalid, noRefs) {
  return serializeToYaml(obj, skipInvalid, noRefs);
}

/**
 * Deeply merges multiple objects into a target object.
 * @param {object} target
 * @param {...object} sources
 * @returns {object}
 */
function mergeDeep(target, ...sources) {
  return deepAssign(target, ...sources);
}

/**
 * Safely stringifies a JavaScript value to JSON, filtering omitted keys.
 * @param {any} data
 * @param {Set<string>} [skippedKeys]
 * @returns {string}
 */
function stringifySafeJson(data, skippedKeys) {
  return safeStringifyJson(data, skippedKeys);
}

/**
 * Strips/hashes passwords from a command string.
 * @param {string} command
 * @returns {string}
 */
function sanitizeCommand(command) {
  return removePassword(command);
}

module.exports = {
  Arch,
  archFromString,
  defaultArchFromString,
  toLinuxArchString,
  getArchSuffix,
  getArchCliNames,
  getArtifactArchName,
  serializeToYaml,
  deepAssign,
  safeStringifyJson,
  asArray,
  isEmptyOrSpaces,
  isEnvTrue,
  isTokenCharValid,
  replaceDefault,
  removePassword,
  getPlatformIconFileName,
  InvalidConfigurationError,
  ExecError,
  resolveArch,
  formatLinuxArch,
  dumpYaml,
  mergeDeep,
  stringifySafeJson,
  sanitizeCommand
};
test/contract.js
'use strict';

const assert = require('assert');
const crypto = require('crypto');
const {
  Arch,
  defaultArchFromString,
  getArchSuffix,
  getArtifactArchName,
  isEmptyOrSpaces,
  isEnvTrue,
  replaceDefault,
  InvalidConfigurationError,
  resolveArch,
  formatLinuxArch,
  dumpYaml,
  mergeDeep,
  stringifySafeJson,
  sanitizeCommand
} = require('../src/index');

// 1. archFromString maps valid architecture names to Arch enum values and throws for invalid architecture names
{
  assert.strictEqual(resolveArch('x64'), Arch.x64);
  assert.strictEqual(resolveArch('ia32'), Arch.ia32);
  assert.strictEqual(resolveArch('arm64'), Arch.arm64);
  assert.strictEqual(resolveArch('armv7l'), Arch.armv7l);
  assert.strictEqual(resolveArch('arm'), Arch.armv7l);
  assert.strictEqual(resolveArch('universal'), Arch.universal);
  assert.strictEqual(defaultArchFromString(undefined), Arch.x64);
  assert.strictEqual(defaultArchFromString('arm64'), Arch.arm64);
  assert.throws(() => resolveArch('invalid_arch'), /^Error: Unsupported arch invalid_arch/);
}

// 2. toLinuxArchString formats architecture names according to package target type
{
  assert.strictEqual(formatLinuxArch(Arch.x64), 'amd64');
  assert.strictEqual(formatLinuxArch(Arch.x64, 'flatpak'), 'x86_64');
  assert.strictEqual(formatLinuxArch(Arch.ia32), 'i386');
  assert.strictEqual(formatLinuxArch(Arch.ia32, 'pacman'), 'i686');
  assert.strictEqual(formatLinuxArch(Arch.arm64), 'arm64');
  assert.strictEqual(formatLinuxArch(Arch.arm64, 'rpm'), 'aarch64');
  assert.strictEqual(formatLinuxArch(Arch.arm64, 'pacman'), 'aarch64');
  assert.strictEqual(formatLinuxArch(Arch.arm64, 'flatpak'), 'aarch64');
  assert.strictEqual(formatLinuxArch(Arch.armv7l), 'armv7l');
  assert.strictEqual(formatLinuxArch(Arch.armv7l, 'deb'), 'armhf');
  assert.strictEqual(formatLinuxArch(Arch.armv7l, 'snap'), 'armhf');
  assert.strictEqual(formatLinuxArch(Arch.armv7l, 'flatpak'), 'arm');
  assert.throws(() => formatLinuxArch(Arch.universal), /^Error: Unsupported arch 4/);
}

// 3. getArchSuffix returns empty string for default arch and hyphenated suffix for target arch
{
  assert.strictEqual(getArchSuffix(Arch.x64), '');
  assert.strictEqual(getArchSuffix(Arch.arm64), '-arm64');
  assert.strictEqual(getArchSuffix(Arch.ia32), '-ia32');
  assert.strictEqual(getArchSuffix(Arch.armv7l), '-armv7l');
  assert.strictEqual(getArchSuffix(Arch.arm64, 'arm64'), '');
}

// 4. getArtifactArchName maps architecture and target artifact extensions to distribution architecture names
{
  assert.strictEqual(getArtifactArchName(Arch.x64, 'deb'), 'amd64');
  assert.strictEqual(getArtifactArchName(Arch.x64, 'rpm'), 'x86_64');
  assert.strictEqual(getArtifactArchName(Arch.x64, 'AppImage'), 'x86_64');
  assert.strictEqual(getArtifactArchName(Arch.ia32, 'deb'), 'i386');
  assert.strictEqual(getArtifactArchName(Arch.ia32, 'rpm'), 'i686');
  assert.strictEqual(getArtifactArchName(Arch.armv7l, 'snap'), 'armhf');
  assert.strictEqual(getArtifactArchName(Arch.armv7l, 'flatpak'), 'arm');
  assert.strictEqual(getArtifactArchName(Arch.arm64, 'rpm'), 'aarch64');
  assert.strictEqual(getArtifactArchName(Arch.arm64, 'deb'), 'arm64');
}

// 5. serializeToYaml serializes objects to YAML format string
{
  const config = {
    appId: 'com.example.sampleapp',
    productName: 'SampleApp',
    directories: {
      output: 'dist'
    },
    linux: {
      target: ['deb', 'rpm']
    }
  };
  const yamlOutput = dumpYaml(config);
  assert.strictEqual(typeof yamlOutput, 'string');
  assert(yamlOutput.includes('appId: com.example.sampleapp'));
  assert(yamlOutput.includes('productName: SampleApp'));
  assert(yamlOutput.includes('output: dist'));
  assert(yamlOutput.includes('- deb'));
  assert(yamlOutput.includes('- rpm'));
}

// 6. deepAssign performs deep property assignment and deduplicates merged arrays
{
  const baseConfig = {
    appName: 'Base',
    files: ['src/**', 'assets/**'],
    buildOptions: {
      minify: false,
      debug: true
    }
  };
  const overrideConfig = {
    appName: 'Overridden',
    files: ['assets/**', 'extra/**'],
    buildOptions: {
      minify: true
    },
    version: '1.0.0'
  };
  const merged = mergeDeep(baseConfig, overrideConfig);
  assert.strictEqual(merged.appName, 'Overridden');
  assert.strictEqual(merged.version, '1.0.0');
  assert.deepStrictEqual(merged.files, ['src/**', 'assets/**', 'extra/**']);
  assert.deepStrictEqual(merged.buildOptions, {
    minify: true,
    debug: true
  });
}

// 7. safeStringifyJson serializes objects to JSON while masking specified skipped keys
{
  const payload = {
    id: 101,
    name: 'package-test',
    secretToken: 'sensitive-token-12345',
    metadata: {
      env: 'production'
    }
  };
  const jsonStr = stringifySafeJson(payload, new Set(['secretToken']));
  assert.strictEqual(typeof jsonStr, 'string');
  const parsed = JSON.parse(jsonStr);
  assert.strictEqual(parsed.id, 101);
  assert.strictEqual(parsed.name, 'package-test');
  assert.strictEqual(parsed.secretToken, '<stripped sensitive data>');
  assert(!jsonStr.includes('sensitive-token-12345'));
  assert.deepStrictEqual(parsed.metadata, { env: 'production' });
}

// 8. isEmptyOrSpaces and isEnvTrue validate strings and evaluate boolean environment variable strings
{
  assert.strictEqual(isEmptyOrSpaces(null), true);
  assert.strictEqual(isEmptyOrSpaces(undefined), true);
  assert.strictEqual(isEmptyOrSpaces(''), true);
  assert.strictEqual(isEmptyOrSpaces('   '), true);
  assert.strictEqual(isEmptyOrSpaces('\t\n'), true);
  assert.strictEqual(isEmptyOrSpaces('builder-util'), false);

  assert.strictEqual(isEnvTrue(undefined), false);
  assert.strictEqual(isEnvTrue(''), true);
  assert.strictEqual(isEnvTrue('false'), false);
  assert.strictEqual(isEnvTrue('0'), false);
  assert.strictEqual(isEnvTrue('true'), true);
  assert.strictEqual(isEnvTrue('1'), true);
}

// 9. replaceDefault expands default placeholder with provided default list
{
  const defaultList = ['common/**', 'lib/**'];
  assert.deepStrictEqual(replaceDefault(['default'], defaultList), ['common/**', 'lib/**']);
  assert.deepStrictEqual(
    replaceDefault(['custom/prefix/**', 'default', 'custom/suffix/**'], defaultList),
    ['custom/prefix/**', 'common/**', 'lib/**', 'custom/suffix/**']
  );
  assert.deepStrictEqual(replaceDefault(['fixed/**'], defaultList), ['fixed/**']);
}

// 10. removePassword sanitizes password arguments in command strings with SHA-256 hashes
{
  const rawCommand = 'signtool.exe sign -p mySecretPassword123 /f cert.pfx';
  const sanitized = sanitizeCommand(rawCommand);
  const expectedHash = crypto.createHash('sha256').update('mySecretPassword123').digest('hex');
  assert(!sanitized.includes('mySecretPassword123'));
  assert(sanitized.includes(expectedHash));
  assert(sanitized.includes('(sha256 hash)'));
}

// 11. InvalidConfigurationError constructs configuration error with message and error code
{
  const customErr = new InvalidConfigurationError('Field appId is required', 'ERR_APP_ID_MISSING');
  assert(customErr instanceof Error);
  assert(customErr instanceof InvalidConfigurationError);
  assert.strictEqual(customErr.message, 'Field appId is required');
  assert.strictEqual(customErr.code, 'ERR_APP_ID_MISSING');

  const defaultErr = new InvalidConfigurationError('Invalid schema');
  assert.strictEqual(defaultErr.code, 'ERR_ELECTRON_BUILDER_INVALID_CONFIGURATION');
}

console.log('All builder-util contract tests passed successfully.');

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