@esbuild/linux-x64 0.28.1

force=true

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/%40esbuild/linux-x64@0.28.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40esbuild/linux-x64@0.28.1
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - 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.

{"case":{"caseId":"case:sha256:3d1531548947fa1b1e3abeeb76b4aa038e88cb65dc653467f7d80e7c58d627f1","constraints":{"executionContext":"node"},"contract":["package manifest specifies @esbuild/linux-x64 name, version 0.28.1, linux OS, and x64 CPU requirements","resolves path to bin/esbuild executable and reports matching version 0.28.1","validates bin/esbuild executable format as 64-bit ELF binary with standard magic bytes","esbuild binary transforms TypeScript code and JSX syntax to JavaScript","esbuild binary bundles modular source files into a single bundle"],"goal":"verify pkg:npm/%40esbuild/linux-x64@0.28.1","kind":"HOW","packages":["pkg:npm/%40esbuild/linux-x64@0.28.1"],"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","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40esbuild/linux-x64@0.28.1"],"schemaVersion":1,"subject":"pkg:npm/%40esbuild/linux-x64@0.28.1","verifierAdapter":"node-typescript@1"}

const { spawnSync } = require('child_process');
const fs = require('fs');
const path = require('path');

function getPackageManifest() {
  const manifestPath = require.resolve('@esbuild/linux-x64/package.json');
  return JSON.parse(fs.readFileSync(manifestPath, 'utf8'));
}

function getBinaryPath() {
  const binaryPath = require.resolve('@esbuild/linux-x64/bin/esbuild');
  if (!fs.existsSync(binaryPath)) {
    throw new Error(`esbuild binary not found at ${binaryPath}`);
  }
  return binaryPath;
}

function inspectBinaryHeader() {
  const binaryPath = getBinaryPath();
  const buffer = Buffer.alloc(16);
  const fd = fs.openSync(binaryPath, 'r');
  try {
    fs.readSync(fd, buffer, 0, 16, 0);
  } finally {
    fs.closeSync(fd);
  }

  const stat = fs.statSync(binaryPath);

  return {
    path: binaryPath,
    size: stat.size,
    isElf: buffer[0] === 0x7f && buffer[1] === 0x45 && buffer[2] === 0x4c && buffer[3] === 0x46,
    is64Bit: buffer[4] === 2,
    isLittleEndian: buffer[5] === 1,
    isExecutable: (stat.mode & 0o111) !== 0,
  };
}

function getVersion() {
  const binaryPath = getBinaryPath();
  const result = spawnSync(binaryPath, ['--version'], {
    encoding: 'utf8',
  });
  if (result.status !== 0) {
    throw new Error(`esbuild --version failed: ${result.stderr}`);
  }
  return result.stdout.trim();
}

function transformCode(code, loader = 'ts', extraFlags = []) {
  const binaryPath = getBinaryPath();
  const args = [`--loader=${loader}`, ...extraFlags];
  const result = spawnSync(binaryPath, args, {
    input: code,
    encoding: 'utf8',
  });
  if (result.status !== 0) {
    throw new Error(`esbuild transform failed: ${result.stderr}`);
  }
  return result.stdout;
}

function bundleFile(entryPoint, outfile, extraFlags = []) {
  const binaryPath = getBinaryPath();
  const args = [
    entryPoint,
    '--bundle',
    `--outfile=${outfile}`,
    ...extraFlags,
  ];
  const result = spawnSync(binaryPath, args, {
    encoding: 'utf8',
  });
  if (result.status !== 0) {
    throw new Error(`esbuild bundle failed: ${result.stderr}`);
  }
  return fs.readFileSync(outfile, 'utf8');
}

module.exports = {
  getPackageManifest,
  getBinaryPath,
  inspectBinaryHeader,
  getVersion,
  transformCode,
  bundleFile,
};

{
  "name": "sample-esbuild-linux-x64",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-esbuild-linux-x64",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@esbuild/linux-x64": "0.28.1"
      }
    },
    "node_modules/@esbuild/linux-x64": {
      "version": "0.28.1",
      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.28.1.tgz",
      "integrity": "sha512-u/anNYF2mmVOEDwLtnQ1wOr3EZ9sTNGLWrsYGYwHWzGA3Si84IOkHXlbWTD1NB+9/1lcnweYKO54uhxZydNzfA==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=18"
      }
    }
  }
}

{
  "name": "sample-esbuild-linux-x64",
  "version": "1.0.0",
  "description": "verify pkg:npm/@esbuild/linux-x64@0.28.1",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "@esbuild/linux-x64": "0.28.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40esbuild/linux-x64@0.28.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40esbuild/linux-x64@0.28.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}

const assert = require('assert');
const fs = require('fs');
const path = require('path');
const os = require('os');
const {
  getPackageManifest,
  getBinaryPath,
  inspectBinaryHeader,
  getVersion,
  transformCode,
  bundleFile,
} = require('../index.js');

// Contract 1: package manifest specifies @esbuild/linux-x64 name, version 0.28.1, linux OS, and x64 CPU requirements
{
  const manifest = getPackageManifest();
  assert.strictEqual(manifest.name, '@esbuild/linux-x64', 'Package name must be @esbuild/linux-x64');
  assert.strictEqual(manifest.version, '0.28.1', 'Package version must be 0.28.1');
  assert.deepStrictEqual(manifest.os, ['linux'], 'Target OS must be linux');
  assert.deepStrictEqual(manifest.cpu, ['x64'], 'Target CPU must be x64');
}

// Contract 2: resolves path to bin/esbuild executable and reports matching version 0.28.1
{
  const binPath = getBinaryPath();
  assert.strictEqual(typeof binPath, 'string', 'Binary path must be a string');
  assert.strictEqual(path.basename(binPath), 'esbuild', 'Binary filename must be esbuild');
  const version = getVersion();
  assert.strictEqual(version, '0.28.1', 'Expected version to be 0.28.1');
}

// Contract 3: validates bin/esbuild executable format as 64-bit ELF binary with standard magic bytes
{
  const info = inspectBinaryHeader();
  assert.strictEqual(info.isElf, true, 'Binary must have standard ELF magic header');
  assert.strictEqual(info.is64Bit, true, 'Binary must be 64-bit ELF');
  assert.strictEqual(info.isLittleEndian, true, 'Binary must be little-endian');
  assert.strictEqual(info.isExecutable, true, 'Binary must have executable permissions');
  assert(info.size > 1000000, `Binary size must be substantial (actual: ${info.size})`);
}

// Contract 4: esbuild binary transforms TypeScript code and JSX syntax to JavaScript
{
  const tsCode = 'export const add = (a: number, b: number): number => a + b;\nexport const result = add(2, 3);';
  const transformedTs = transformCode(tsCode, 'ts', ['--minify']);
  assert(typeof transformedTs === 'string', 'Expected transformed output to be a string');
  assert(!transformedTs.includes(': number'), 'Expected type annotations to be stripped');
  assert(transformedTs.includes('add'), 'Expected transformed output to contain function name');

  const jsxCode = 'const Greeting = ({ name }) => <div>Hello, {name}!</div>;';
  const transformedJsx = transformCode(jsxCode, 'jsx');
  assert(typeof transformedJsx === 'string', 'Expected transformed output to be a string');
  assert(!transformedJsx.includes('<div>'), 'Expected JSX tags to be transformed');
  assert(transformedJsx.includes('React.createElement') || transformedJsx.includes('Hello'), 'Expected JSX transformed output');
}

// Contract 5: esbuild binary bundles modular source files into a single bundle
{
  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'esbuild-test-'));
  const entryFile = path.join(tmpDir, 'entry.js');
  const modFile = path.join(tmpDir, 'math.js');
  const outFile = path.join(tmpDir, 'bundle.js');

  fs.writeFileSync(modFile, 'export function multiply(x, y) { return x * y; }');
  fs.writeFileSync(entryFile, 'import { multiply } from "./math.js"; console.log(multiply(6, 7));');

  const bundled = bundleFile(entryFile, outFile, ['--format=cjs']);
  assert(fs.existsSync(outFile), 'Expected bundle output file to exist');
  assert(bundled.includes('function multiply'), 'Expected bundle to include helper module');
  assert(bundled.includes('multiply(6, 7)'), 'Expected bundle to include entry call');

  fs.rmSync(tmpDir, { recursive: true, force: true });
}

console.log('All contracts passed successfully.');