bare-bundle 1.10.0: Bundle.prototype.mount

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/bare-bundle@1.10.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/bare-bundle@1.10.0
Demonstrate these symbols/APIs:
  - Bundle.prototype.mount

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:c5c0b073330d1028c4248af91bdc98ac8620c39c9670772f0e887263f25bc42d","contract":["Bundle.prototype.mount returns a new Bundle instance preserving source bundle immutability","Bundle.prototype.mount converts absolute and relative file paths to root URLs while preserving external and bare specifiers","Bundle.prototype.mount mounts main entry point specifier to root URL","Bundle.prototype.mount mounts addons and assets paths under root URL","Bundle.prototype.mount mounts imports aliases and nested resolutions","Bundle.prototype.mount supports conditions option for conditional imports mapping"],"goal":"verify pkg:npm/bare-bundle@1.10.0","kind":"HOW","packages":["pkg:npm/bare-bundle@1.10.0"],"schemaVersion":1,"symbols":["Bundle.prototype.mount"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/bare-bundle@1.10.0"],"schemaVersion":1,"subject":"pkg:npm/bare-bundle@1.10.0","symbols":["Bundle.prototype.mount"],"verifierAdapter":"node-typescript@1"}

import Bundle from 'bare-bundle';

/**
 * Mounts bundle specifiers under a given root URL.
 * @param {Bundle} bundle
 * @param {string|URL} root
 * @param {object} [opts]
 * @returns {Bundle}
 */
export function mountBundle(bundle, root, opts) {
  return bundle.mount(root, opts);
}

/**
 * Mounts and then unmounts a bundle against a root URL.
 * @param {Bundle} bundle
 * @param {string|URL} root
 * @param {object} [opts]
 * @returns {Bundle}
 */
export function roundtripMount(bundle, root, opts) {
  const mounted = bundle.mount(root, opts);
  return mounted.unmount(root, opts);
}

export default Bundle;
export { Bundle };

{
  "name": "sample-bare-bundle",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-bare-bundle",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "bare-bundle": "1.10.0"
      }
    },
    "node_modules/bare-bundle": {
      "version": "1.10.0",
      "resolved": "https://registry.npmjs.org/bare-bundle/-/bare-bundle-1.10.0.tgz",
      "integrity": "sha512-4LVlnJAHr00Hh6Vu6ZUJS38rcEtJT3b3vChXSsBsJ2mk1TN0lQ+gzd+Dw5L0aV7uqDZv84smuwW+O02X7PfDlw==",
      "license": "Apache-2.0",
      "peerDependencies": {
        "bare-buffer": "*",
        "bare-url": "*"
      },
      "peerDependenciesMeta": {
        "bare-buffer": {
          "optional": true
        },
        "bare-url": {
          "optional": true
        }
      }
    }
  }
}

{
  "name": "sample-bare-bundle",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "bare-bundle": "1.10.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/bare-bundle@1.10.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-bundle@1.10.0"
  ],
  "symbols": [
    "Bundle.prototype.mount"
  ]
}

import assert from 'node:assert/strict';
import Bundle, { mountBundle, roundtripMount } from '../index.js';

// 1. Bundle.prototype.mount returns a new Bundle instance preserving source bundle immutability
{
  const original = new Bundle();
  original.write('/index.js', 'console.log("hello");', { main: true });

  const mounted = original.mount('https://example.com/app/');

  assert.notEqual(mounted, original);
  assert.equal(Bundle.isBundle(mounted), true);
  assert.equal(original.exists('/index.js'), true);
  assert.equal(original.exists('https://example.com/app/index.js'), false);
  assert.equal(mounted.exists('https://example.com/app/index.js'), true);
  assert.equal(mounted.exists('/index.js'), false);
}

// 2. Bundle.prototype.mount converts absolute and relative file paths to root URLs while preserving external and bare specifiers
{
  const bundle = new Bundle();
  bundle.write('/index.js', 'console.log("absolute");');
  bundle.write('./helper.js', 'console.log("relative");');
  bundle.write('bare-module', 'console.log("bare");');
  bundle.write('https://external.example.org/lib.js', 'console.log("external");');

  const mounted = mountBundle(bundle, 'https://example.com/app/');

  assert.equal(mounted.exists('https://example.com/app/index.js'), true);
  assert.equal(mounted.exists('https://example.com/app/helper.js'), true);
  assert.equal(mounted.exists('bare-module'), true);
  assert.equal(mounted.exists('https://external.example.org/lib.js'), true);

  assert.equal(mounted.read('https://example.com/app/index.js').toString('utf8'), 'console.log("absolute");');
  assert.equal(mounted.read('https://example.com/app/helper.js').toString('utf8'), 'console.log("relative");');
  assert.equal(mounted.read('bare-module').toString('utf8'), 'console.log("bare");');
  assert.equal(mounted.read('https://external.example.org/lib.js').toString('utf8'), 'console.log("external");');
}

// 3. Bundle.prototype.mount mounts main entry point specifier to root URL
{
  const bundle = new Bundle();
  bundle.write('/entry.js', 'export default 1;', { main: true });

  const mounted = bundle.mount('https://example.com/app/');

  assert.equal(mounted.main, 'https://example.com/app/entry.js');
}

// 4. Bundle.prototype.mount mounts addons and assets paths under root URL
{
  const bundle = new Bundle();
  bundle.write('/addon.bare', Buffer.from([0x01, 0x02]), { addon: true });
  bundle.write('/logo.png', Buffer.from([0x89, 0x50]), { asset: true });

  const mounted = bundle.mount('https://example.com/app/');

  assert.deepEqual(mounted.addons, ['https://example.com/app/addon.bare']);
  assert.deepEqual(mounted.assets, ['https://example.com/app/logo.png']);
}

// 5. Bundle.prototype.mount mounts imports aliases and nested resolutions
{
  const bundle = new Bundle();
  bundle.write('/app.js', 'import dep from "dep";', {
    alias: 'main-entry',
    imports: { dep: '/dep.js' }
  });

  const mounted = bundle.mount('https://example.com/app/');

  assert.deepEqual(mounted.imports, { 'main-entry': 'https://example.com/app/app.js' });
  assert.deepEqual(mounted.resolutions, {
    'https://example.com/app/app.js': { dep: 'https://example.com/app/dep.js' }
  });

  // Verify roundtripMount helper
  const roundtripped = roundtripMount(bundle, 'https://example.com/app/');
  assert.deepEqual(roundtripped.imports, { 'main-entry': '/app.js' });
  assert.deepEqual(roundtripped.resolutions, { '/app.js': { dep: '/dep.js' } });
}

// 6. Bundle.prototype.mount supports conditions option for conditional imports mapping
{
  const bundle = new Bundle();
  bundle.write('/feature.js', 'export default {};', {
    imports: {
      pkg: {
        browser: '/browser.js',
        node: '/node.js',
        default: '/default.js'
      }
    }
  });

  const mounted = bundle.mount('https://example.com/app/', {
    conditions: {
      browser: 'https://cdn.example.com/assets/'
    }
  });

  assert.deepEqual(mounted.resolutions['https://example.com/app/feature.js'], {
    pkg: {
      browser: 'https://cdn.example.com/assets/browser.js',
      node: 'https://example.com/app/node.js',
      default: 'https://example.com/app/default.js'
    }
  });
}

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