rollup 4.62.3

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/rollup@4.62.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/rollup@4.62.3

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.

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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "rollup-sample",
      "version": "1.0.0",
      "dependencies": {
        "rollup": "4.62.3"
      }
    },
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      "cpu": [
        "arm"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "android"
      ]
    },
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      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.62.3.tgz",
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      "optional": true,
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      "cpu": [
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      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "darwin"
      ]
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      "cpu": [
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      "license": "MIT",
      "optional": true,
      "os": [
        "darwin"
      ]
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      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-x64/-/rollup-freebsd-x64-4.62.3.tgz",
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      "optional": true,
      "os": [
        "freebsd"
      ]
    },
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      "license": "MIT",
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      "license": "MIT",
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      "license": "MIT",
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      "license": "MIT",
      "optional": true,
      "os": [
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    "node_modules/@rollup/rollup-linux-s390x-gnu": {
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      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
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      "cpu": [
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      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-x64-musl": {
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      "cpu": [
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      ],
      "license": "MIT",
      "optional": true,
      "os": [
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      ]
    },
    "node_modules/@rollup/rollup-openbsd-x64": {
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      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "openbsd"
      ]
    },
    "node_modules/@rollup/rollup-openharmony-arm64": {
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      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "openharmony"
      ]
    },
    "node_modules/@rollup/rollup-win32-arm64-msvc": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-arm64-msvc/-/rollup-win32-arm64-msvc-4.62.3.tgz",
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      "cpu": [
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      ],
      "license": "MIT",
      "optional": true,
      "os": [
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      ]
    },
    "node_modules/@rollup/rollup-win32-ia32-msvc": {
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      "license": "MIT",
      "optional": true,
      "os": [
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    "node_modules/@rollup/rollup-win32-x64-gnu": {
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      "license": "MIT",
      "optional": true,
      "os": [
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      "hasInstallScript": true,
      "license": "MIT",
      "optional": true,
      "os": [
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      "engines": {
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      "license": "MIT",
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      "bin": {
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      },
      "engines": {
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        "npm": ">=8.0.0"
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      "optionalDependencies": {
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        "@rollup/rollup-darwin-arm64": "4.62.3",
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        "@rollup/rollup-freebsd-x64": "4.62.3",
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        "@rollup/rollup-linux-ppc64-musl": "4.62.3",
        "@rollup/rollup-linux-riscv64-gnu": "4.62.3",
        "@rollup/rollup-linux-riscv64-musl": "4.62.3",
        "@rollup/rollup-linux-s390x-gnu": "4.62.3",
        "@rollup/rollup-linux-x64-gnu": "4.62.3",
        "@rollup/rollup-linux-x64-musl": "4.62.3",
        "@rollup/rollup-openbsd-x64": "4.62.3",
        "@rollup/rollup-openharmony-arm64": "4.62.3",
        "@rollup/rollup-win32-arm64-msvc": "4.62.3",
        "@rollup/rollup-win32-ia32-msvc": "4.62.3",
        "@rollup/rollup-win32-x64-gnu": "4.62.3",
        "@rollup/rollup-win32-x64-msvc": "4.62.3",
        "fsevents": "~2.3.2"
      }
    }
  }
}

{
  "name": "rollup-sample",
  "version": "1.0.0",
  "dependencies": {
    "rollup": "4.62.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/rollup@4.62.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/rollup@4.62.3"
  ]
}

import { rollup } from 'rollup';

/**
 * Creates an in-memory virtual module plugin from a dictionary of module paths and contents.
 *
 * @param {Record<string, string>} modules - Mapping of module ID to source code string.
 * @returns {import('rollup').Plugin}
 */
export function createMemoryPlugin(modules) {
  return {
    name: 'memory-plugin',
    resolveId(source) {
      if (Object.prototype.hasOwnProperty.call(modules, source)) {
        return source;
      }
      return null;
    },
    load(id) {
      if (Object.prototype.hasOwnProperty.call(modules, id)) {
        return modules[id];
      }
      return null;
    },
  };
}

/**
 * Bundles in-memory JavaScript modules into a single string bundle.
 *
 * @param {string} entry - Entry module identifier.
 * @param {Record<string, string>} modules - Dictionary of module ID to code.
 * @param {'es' | 'cjs'} [format='es'] - Output module format.
 * @returns {Promise<{ code: string, exports: string[] }>}
 */
export async function bundleMemory(entry, modules, format = 'es') {
  const plugin = createMemoryPlugin(modules);
  const build = await rollup({
    input: entry,
    plugins: [plugin],
  });

  const { output } = await build.generate({
    format,
    exports: format === 'cjs' ? 'named' : 'auto',
  });

  await build.close();

  const chunk = output[0];
  return {
    code: chunk.code,
    exports: chunk.exports,
  };
}

/**
 * Bundles code with custom rollup plugins.
 *
 * @param {string} entry
 * @param {Array<import('rollup').Plugin>} plugins
 * @param {'es' | 'cjs'} [format='es']
 * @returns {Promise<{ code: string }>}
 */
export async function bundleWithPlugins(entry, plugins, format = 'es') {
  const build = await rollup({
    input: entry,
    plugins,
  });

  const { output } = await build.generate({
    format,
  });

  await build.close();

  return {
    code: output[0].code,
  };
}

import assert from 'node:assert/strict';
import { bundleMemory, bundleWithPlugins, createMemoryPlugin } from '../src/index.mjs';

// Contract 1: rollup bundles ES module sources and generates bundled output code in specified format
{
  const modules = {
    'entry.js': 'import { add } from "./math.js"; export const sum = add(10, 20);',
    './math.js': 'export function add(a, b) { return a + b; }',
  };

  const esResult = await bundleMemory('entry.js', modules, 'es');
  assert.ok(esResult.code.includes('add(10, 20)'), 'ES output should include the module function call');
  assert.ok(esResult.code.includes('sum = add(10, 20)'), 'ES output should export sum');
  assert.deepStrictEqual(esResult.exports, ['sum'], 'ES output should list sum in exports');

  const cjsResult = await bundleMemory('entry.js', modules, 'cjs');
  assert.ok(cjsResult.code.includes('exports.sum = sum;'), 'CJS output should export sum on exports object');
}

// Contract 2: rollup dead-code elimination removes unreferenced exports and unused statements from bundle
{
  const modules = {
    'entry.js': 'import { usedFunction } from "./utils.js"; export const value = usedFunction();',
    './utils.js': `
      export function usedFunction() { return "used"; }
      export function deadFunction() { return "should_be_removed"; }
      const unusedVariable = "unused_secret";
    `,
  };

  const result = await bundleMemory('entry.js', modules, 'es');
  assert.ok(result.code.includes('usedFunction'), 'Bundle must retain referenced function');
  assert.ok(!result.code.includes('deadFunction'), 'Bundle must eliminate unreferenced export deadFunction');
  assert.ok(!result.code.includes('unused_secret'), 'Bundle must eliminate unused variables');
}

// Contract 3: rollup plugins intercept module resolution and source loading via resolveId and load hooks
{
  const resolvedIds = [];
  const loadedIds = [];

  const tracingPlugin = {
    name: 'tracing-plugin',
    resolveId(source) {
      resolvedIds.push(source);
      if (source === 'virtual:greeting') {
        return '\0virtual:greeting';
      }
      return null;
    },
    load(id) {
      loadedIds.push(id);
      if (id === '\0virtual:greeting') {
        return 'export const message = "hello from virtual plugin";';
      }
      return null;
    },
  };

  const rootPlugin = createMemoryPlugin({
    'entry.js': 'import { message } from "virtual:greeting"; export const greeting = message;',
  });

  const result = await bundleWithPlugins('entry.js', [tracingPlugin, rootPlugin], 'es');
  assert.ok(resolvedIds.includes('virtual:greeting'), 'resolveId hook must receive virtual module specifier');
  assert.ok(loadedIds.includes('\0virtual:greeting'), 'load hook must be called with resolved module id');
  assert.ok(result.code.includes('hello from virtual plugin'), 'Bundle must contain generated virtual module content');
}

console.log('All pkg:npm/rollup@4.62.3 contracts passed successfully.');