CodeSampleX

Sample

esbuild 0.28.2

Verified sample for npm esbuild 0.28.2. The contract ran on node 22 · linux alpine/x64 · docker and passed: assert esbuild exports expected version 0.28.2

sha256:540fea1a02ddeb506a9e2e661d54ce7fd6134dfbcd521956067a8409a8380517

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
2
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@1		 2026-08-21
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-08

Case

HOW
Goal
verify pkg:npm/esbuild@0.28.2
Packages
Created
2026-08-21T15:09:55Z

Contract

  1. assert esbuild exports expected version 0.28.2
  2. assert esbuild.buildSync bundles TypeScript source code into ESM in memory
  3. assert esbuild.transformSync transpiles JSX syntax to JavaScript with minification
  4. assert esbuild.formatMessagesSync formats diagnostic error messages with file location and source line context
  5. assert esbuild.analyzeMetafileSync computes formatted bundle breakdown from build metafile

Files

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

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/esbuild@0.28.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/esbuild@0.28.2

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:sha256:3c9c0108451eee38953dbcb0b952022c0329496c5825b1b312063cfda2b69a88","contract":["assert esbuild exports expected version 0.28.2","assert esbuild.buildSync bundles TypeScript source code into ESM in memory","assert esbuild.transformSync transpiles JSX syntax to JavaScript with minification","assert esbuild.formatMessagesSync formats diagnostic error messages with file location and source line context","assert esbuild.analyzeMetafileSync computes formatted bundle breakdown from build metafile"],"goal":"verify pkg:npm/esbuild@0.28.2","kind":"HOW","packages":["pkg:npm/esbuild@0.28.2"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/esbuild@0.28.2"],"schemaVersion":1,"subject":"pkg:npm/esbuild@0.28.2","verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-esbuild",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-esbuild",
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        "node": ">=18"
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    "node_modules/@esbuild/android-arm": {
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  }
}
package.json
{
  "name": "sample-esbuild",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "esbuild": "0.28.2"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/esbuild@0.28.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/esbuild@0.28.2"
  ]
}
src/index.mjs
import * as esbuild from 'esbuild';

/**
 * Bundles TypeScript or JavaScript source code in memory.
 * @param {string} contents - Source code contents.
 * @param {'ts' | 'js' | 'jsx' | 'tsx'} loader - Loader type.
 * @returns {import('esbuild').BuildResult} Build result object.
 */
export function bundleInMemory(contents, loader = 'ts') {
  return esbuild.buildSync({
    stdin: {
      contents,
      loader,
      resolveDir: process.cwd(),
    },
    format: 'esm',
    write: false,
    bundle: true,
  });
}

/**
 * Transpiles and minifies source code.
 * @param {string} contents - Source code contents.
 * @param {import('esbuild').TransformOptions} options - Transform options.
 * @returns {import('esbuild').TransformResult} Transform result object.
 */
export function transformSource(contents, options = {}) {
  return esbuild.transformSync(contents, options);
}

/**
 * Formats diagnostic messages.
 * @param {import('esbuild').PartialMessage[]} messages - Diagnostic messages.
 * @param {import('esbuild').FormatMessagesOptions} options - Formatting options.
 * @returns {string[]} Array of formatted message strings.
 */
export function formatDiagnostics(messages, options = { kind: 'error', color: false }) {
  return esbuild.formatMessagesSync(messages, options);
}

/**
 * Analyzes build metafile.
 * @param {import('esbuild').Metafile} metafile - Build metafile object.
 * @param {import('esbuild').AnalyzeMetafileOptions} options - Analysis options.
 * @returns {string} Formatted metafile breakdown string.
 */
export function analyzeBuild(metafile, options = { verbose: false, color: false }) {
  return esbuild.analyzeMetafileSync(metafile, options);
}

export { esbuild };
test/contract.mjs
import assert from 'node:assert';
import {
  esbuild,
  bundleInMemory,
  transformSource,
  formatDiagnostics,
  analyzeBuild,
} from '../src/index.mjs';

// 1. esbuild exports expected version 0.28.2
assert.strictEqual(esbuild.version, '0.28.2', 'esbuild version matches 0.28.2');

// 2. esbuild.buildSync bundles TypeScript source code into ESM in memory
const buildRes = bundleInMemory('export const calculate = (x: number, y: number): number => x * y + 10;', 'ts');
assert.strictEqual(buildRes.errors.length, 0, 'build completed with zero errors');
assert.strictEqual(buildRes.outputFiles.length, 1, 'build emitted one output file');
assert(buildRes.outputFiles[0].text.includes('calculate = (x, y) => x * y + 10'), 'bundle contains compiled function');

// 3. esbuild.transformSync transpiles JSX syntax to JavaScript with minification
const transformRes = transformSource('const View = () => <section><span>Active</span></section>;', {
  loader: 'jsx',
  minify: true,
});
assert.strictEqual(transformRes.warnings.length, 0, 'transform completed with zero warnings');
assert(transformRes.code.includes('React.createElement'), 'JSX converted to React.createElement');

// 4. esbuild.formatMessagesSync formats diagnostic error messages with file location and source line context
const formatted = formatDiagnostics([
  {
    text: 'Unexpected token in expression',
    location: {
      file: 'index.ts',
      line: 4,
      column: 12,
      lineText: 'const total = + ;',
    },
  },
], {
  kind: 'error',
  color: false,
});
assert.strictEqual(formatted.length, 1, 'formatted exactly one error message');
assert(formatted[0].includes('Unexpected token in expression'), 'formatted message includes error text');
assert(formatted[0].includes('index.ts:4:12'), 'formatted message includes file line and column');

// 5. esbuild.analyzeMetafileSync computes formatted bundle breakdown from build metafile
const metaBuild = esbuild.buildSync({
  stdin: {
    contents: 'const msg = "bundle meta test"; console.log(msg);',
    loader: 'js',
    resolveDir: process.cwd(),
  },
  metafile: true,
  write: false,
});
assert(metaBuild.metafile !== undefined, 'build generated metafile');
const analysis = analyzeBuild(metaBuild.metafile, {
  verbose: false,
  color: false,
});
assert(typeof analysis === 'string', 'metafile analysis returns string');
assert(analysis.length > 0, 'metafile analysis string is non-empty');

console.log('Contract tests passed successfully.');

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