rollup 4.63.3: rollup

# Rollup 4.63.3 Programmatic Bundling and Chunk Splitting

## Prior Solutions Query

A search for prior solutions returned COMPATIBLE samples for Rollup:
- Sample `ff850f6fc4dd7a51ecad7c7901a9a8c816e5c6d0f050c173d970d8ee383756ae`: verify pkg:npm/rollup@4.62.4.

This sample proves programmatic bundling, multi-entry chunk splitting via manualChunks, and plugin transformation hooks on rollup@4.63.3.

## Pinned Release

- `rollup`: `4.63.3`

## Proved Behavior

1. **Single bundle generation**: `rollup.rollup({ input, plugins })` creates a bundle that can be rendered to both ES modules (`bundle.generate({ format: 'es' })`) and CommonJS (`bundle.generate({ format: 'cjs' })`), correctly resolving and inlining internal module dependencies.
2. **Code splitting with manualChunks**: Supplying a `manualChunks` function splits shared dependencies into isolated chunk files referenced by multi-entry chunk outputs.
3. **Plugin transforms**: The `transform` plugin hook modifies module source code prior to bundle composition, ensuring replaced tokens appear in final chunks.

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 rollup.rollup in pkg:npm/rollup@4.63.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/rollup@4.63.3
Demonstrate these symbols/APIs:
  - rollup.rollup

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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}

{
  "name": "rollup-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "rollup": "4.63.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify rollup.rollup in pkg:npm/rollup@4.63.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/rollup@4.63.3"
  ],
  "symbols": [
    "rollup.rollup"
  ]
}

import assert from 'node:assert/strict';
import { rollup } from 'rollup';

// In-memory plugin providing mock modules for testing rollup API
function virtualModulesPlugin(modules = {}) {
  return {
    name: 'test-virtual-modules',
    resolveId(id) {
      if (id in modules) return id;
      if (id.startsWith('./') && id.slice(2) in modules) return id.slice(2);
      return null;
    },
    load(id) {
      return modules[id] ?? null;
    },
  };
}

async function testSingleBundleGeneration() {
  const modules = {
    'entry.js': `
      import { add } from './math.js';
      export const compute = (x) => add(x, 10);
    `,
    'math.js': `
      export function add(a, b) {
        return a + b;
      }
    `,
  };

  const bundle = await rollup({
    input: 'entry.js',
    plugins: [virtualModulesPlugin(modules)],
  });

  // Test ESM output
  const esmResult = await bundle.generate({ format: 'es' });
  assert.strictEqual(esmResult.output.length, 1);
  const esmChunk = esmResult.output[0];
  assert.strictEqual(esmChunk.type, 'chunk');
  assert.ok(esmChunk.code.includes('export { compute }'));
  assert.ok(!esmChunk.code.includes('import { add }'), 'math.js should be bundled inline');

  // Test CJS output
  const cjsResult = await bundle.generate({ format: 'cjs', exports: 'named' });
  assert.strictEqual(cjsResult.output.length, 1);
  const cjsChunk = cjsResult.output[0];
  assert.strictEqual(cjsChunk.type, 'chunk');
  assert.ok(cjsChunk.code.includes('exports.compute = compute'));

  // Evaluate CJS output
  const cjsExports = {};
  const cjsFn = new Function('exports', cjsChunk.code);
  cjsFn(cjsExports);
  assert.strictEqual(typeof cjsExports.compute, 'function');
  assert.strictEqual(cjsExports.compute(32), 42);
}

async function testManualChunking() {
  const modules = {
    'appA.js': `
      import { sharedHelper } from './shared.js';
      export const a = sharedHelper() + ' from A';
    `,
    'appB.js': `
      import { sharedHelper } from './shared.js';
      export const b = sharedHelper() + ' from B';
    `,
    'shared.js': `
      export function sharedHelper() {
        return 'shared_value';
      }
    `,
  };

  const bundle = await rollup({
    input: {
      appA: 'appA.js',
      appB: 'appB.js',
    },
    plugins: [virtualModulesPlugin(modules)],
  });

  const { output } = await bundle.generate({
    format: 'es',
    manualChunks(id) {
      if (id === 'shared.js') {
        return 'vendor-shared';
      }
    },
  });

  const chunkNames = output.map((c) => c.fileName);
  assert.ok(chunkNames.some((name) => name.includes('vendor-shared')), 'vendor-shared chunk must be generated');
  assert.ok(chunkNames.some((name) => name.includes('appA')), 'appA chunk must be generated');
  assert.ok(chunkNames.some((name) => name.includes('appB')), 'appB chunk must be generated');

  const vendorChunk = output.find((c) => c.fileName.includes('vendor-shared'));
  assert.ok(vendorChunk.code.includes('sharedHelper'), 'sharedHelper must be in vendor chunk');
}

async function testPluginTransformHook() {
  const modules = {
    'index.js': `
      export const appVersion = '__APP_VERSION__';
    `,
  };

  const transformPlugin = {
    name: 'test-transform',
    transform(code, id) {
      if (id === 'index.js') {
        return {
          code: code.replace('__APP_VERSION__', '4.63.3'),
          map: null,
        };
      }
      return null;
    },
  };

  const bundle = await rollup({
    input: 'index.js',
    plugins: [virtualModulesPlugin(modules), transformPlugin],
  });

  const { output: [chunk] } = await bundle.generate({ format: 'es' });
  assert.ok(chunk.code.includes("'4.63.3'"), 'Transform hook must replace replacement token with target value');
  assert.ok(!chunk.code.includes('__APP_VERSION__'), 'Original token must not exist in output');
}

async function main() {
  await testSingleBundleGeneration();
  await testManualChunking();
  await testPluginTransformHook();
}

main();