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
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - 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:b85f9fdde7430ee95d429eaa7a701ae32ab896a872b6e30895ea3d81f37fddb6","constraints":{"executionContext":"node"},"contract":["rollup bundles ES module sources and generates bundled output code in specified format","rollup dead-code elimination removes unreferenced exports and unused statements from bundle","rollup plugins intercept module resolution and source loading via resolveId and load hooks"],"goal":"verify pkg:npm/rollup@4.62.3","kind":"HOW","packages":["pkg:npm/rollup@4.62.3"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/rollup@4.62.3"],"schemaVersion":1,"subject":"pkg:npm/rollup@4.62.3","verifierAdapter":"node-typescript@1"}

{
  "name": "rollup-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "rollup-sample",
      "version": "1.0.0",
      "dependencies": {
        "rollup": "4.62.3"
      }
    },
    "node_modules/@rollup/rollup-android-arm-eabi": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.62.3.tgz",
      "integrity": "sha512-c0wdcekXtQvvn5Tsrk/+op/gUArrbWaFduBnTLP2l1cKLSQs4diMWjJw3m6A0DdzT8dAAX95KpkJ3qynCePbmw==",
      "cpu": [
        "arm"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "android"
      ]
    },
    "node_modules/@rollup/rollup-android-arm64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.62.3.tgz",
      "integrity": "sha512-3YjElDdWN+qXAFbJ/CzPV+0wspLqh54k/I6GfdYtEJRqg7buSgc1yPM3B+93j1M4neobtkATHZTmxK2AMVGfnA==",
      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "android"
      ]
    },
    "node_modules/@rollup/rollup-darwin-arm64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.62.3.tgz",
      "integrity": "sha512-Pch2pFNOxxz1hTjypIdPyRTR6riiwRl84+VcN9djS680fw+Co1nAJINrdpqp7KV0NvyuU8ilZXZCjd7ykJl1GQ==",
      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "darwin"
      ]
    },
    "node_modules/@rollup/rollup-darwin-x64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.62.3.tgz",
      "integrity": "sha512-LEuncFUHFiF8t4yZVZvvZA1wk0pjAscRnsrn1EfTEmN4HXotBi2YtcnLRyaK6UbuczW7xZS5ES+81Rdz8Z0T6g==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "darwin"
      ]
    },
    "node_modules/@rollup/rollup-freebsd-arm64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-arm64/-/rollup-freebsd-arm64-4.62.3.tgz",
      "integrity": "sha512-zvBUvsQUpOWALdDsk6qbS8bXf2VxmPisuudNDrY7x0p0jBdsoZl8HsHczIOgkQiZldmcacMKtBzpoGVNeIe2bQ==",
      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "freebsd"
      ]
    },
    "node_modules/@rollup/rollup-freebsd-x64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-x64/-/rollup-freebsd-x64-4.62.3.tgz",
      "integrity": "sha512-C2KmNrcSem/AMg984H/dev+si0lieQGdXdR/lYGJnuumXnFb9Y7QdiI62obFdLlxRYLBv4P0eUVIDbD4c1vVvw==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "freebsd"
      ]
    },
    "node_modules/@rollup/rollup-linux-arm-gnueabihf": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-gnueabihf/-/rollup-linux-arm-gnueabihf-4.62.3.tgz",
      "integrity": "sha512-ggXnsTAEzNQx74XpunRsiZ9aBZDsI7XIa0hm2nzR9f4WzH5/f/d73ZSDaC5ejJ8YLY4NW+V3wr0tjOaeCq8hqA==",
      "cpu": [
        "arm"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-arm-musleabihf": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-musleabihf/-/rollup-linux-arm-musleabihf-4.62.3.tgz",
      "integrity": "sha512-2vng+FlzNUhKZxtej3IUqJgbZoQk2M/dwQM20+ULV0R/E/8tr9/P6uEf2iiGIk4HL0zMKh5Jry7mUHdUOvyGgA==",
      "cpu": [
        "arm"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-arm64-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm64-gnu/-/rollup-linux-arm64-gnu-4.62.3.tgz",
      "integrity": "sha512-LLLFZKt4/Nraf9rxDkhiU8QVgLF4WmCkfr0L4fj0fPfIZFBib0DeiFk1hhaYKd03LFAFJcxHslhDFlNJLylf5Q==",
      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-arm64-musl": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm64-musl/-/rollup-linux-arm64-musl-4.62.3.tgz",
      "integrity": "sha512-WJkdQCvS9sWNOUBJZfQRKpZGFBztRzcowI+nndmflKgU4XY+3a420FgTOSKTsVqJbnzSxeT4vaJalpOaPo2YCQ==",
      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-loong64-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-loong64-gnu/-/rollup-linux-loong64-gnu-4.62.3.tgz",
      "integrity": "sha512-PwHXCCS2n64/1Ot6rP1YEYA02MGYBcQlr8CSZZyrUG2O7NH6NklYmvr9v3Jy+5e/eDeNchc/ukmKJi9LuflMIQ==",
      "cpu": [
        "loong64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-loong64-musl": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-loong64-musl/-/rollup-linux-loong64-musl-4.62.3.tgz",
      "integrity": "sha512-vUjxINQu3RC8NZS3ykk1gN65gIz8pAopOq2HXuZhiIxHdx7TFvDG+jgrdSgInu1Eza4/Rfi2VzZgyIgEH4WOaw==",
      "cpu": [
        "loong64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-ppc64-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-ppc64-gnu/-/rollup-linux-ppc64-gnu-4.62.3.tgz",
      "integrity": "sha512-wzko4aJ13+0G3kGnviCg5gnXFKd40izKsrf2uOw12US4XqprkDrmwOpeW14aSNa37V8bfPcz5Fkob6LZ3BAPmA==",
      "cpu": [
        "ppc64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-ppc64-musl": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-ppc64-musl/-/rollup-linux-ppc64-musl-4.62.3.tgz",
      "integrity": "sha512-8120ue0JUMSwy11stlwnfdX3pPd+WZYGCDBwEHWtIHi6pOpZmsEF5QKB7a/UN+XFdqvobxz98kv8RTqikyCEBw==",
      "cpu": [
        "ppc64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-riscv64-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-riscv64-gnu/-/rollup-linux-riscv64-gnu-4.62.3.tgz",
      "integrity": "sha512-XLFHnR3tXMjbOCh2vtVJHmxt+995uJsTERQyseFDRA0xxMxyTZPLa3OIUlyFaO4mF/Lu0FjmWHCuPXJT1n/IOg==",
      "cpu": [
        "riscv64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-riscv64-musl": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-riscv64-musl/-/rollup-linux-riscv64-musl-4.62.3.tgz",
      "integrity": "sha512-se6yXvNGMIl0f+RQzyh7XAmia8/9kplQx424wnG2w0C1oi6XgO6Y8otKhdXFHbHs88Ihavzmvh1NWjuovE76BQ==",
      "cpu": [
        "riscv64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-s390x-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-s390x-gnu/-/rollup-linux-s390x-gnu-4.62.3.tgz",
      "integrity": "sha512-gNoxRefktVIiGflpONuxWWXZAzIQG++z9qHO3xKwk4WdDMuQja3JHGfE1u0i3PfPDyvhypdk+WrgIJqLhGG7sg==",
      "cpu": [
        "s390x"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-x64-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-x64-gnu/-/rollup-linux-x64-gnu-4.62.3.tgz",
      "integrity": "sha512-V4KtWtQfAFMU7+9/A/VDps/VI8CHd3cYz0L8sgJzz8qK7eY7wI4ruFD82UYIYvW9Z4DtlTfhQcsl4XyPHW5uSg==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-linux-x64-musl": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-x64-musl/-/rollup-linux-x64-musl-4.62.3.tgz",
      "integrity": "sha512-LBx9LYXvj2CBkMkjLdNAWLwH0MLMin7do2VcVo9kVPibGLkY0BQQut2fv7NVqkXqZ/CrAu9LqDHVV1xHCMpCPw==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "linux"
      ]
    },
    "node_modules/@rollup/rollup-openbsd-x64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-openbsd-x64/-/rollup-openbsd-x64-4.62.3.tgz",
      "integrity": "sha512-ABVf3Q0RCu7NcyCCOZQI0pJ3GuSdfSl8EXcy88QtdceIMIoCUdfhsJChZ64L9zVM2aJHjde1Bhn5uqSRcX9ySA==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "openbsd"
      ]
    },
    "node_modules/@rollup/rollup-openharmony-arm64": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-openharmony-arm64/-/rollup-openharmony-arm64-4.62.3.tgz",
      "integrity": "sha512-+2Cy/ldweGBLlPIKsQLF8U5N44a0KDdbrk1rAjHOM9M2K+kGdIVjHLmmrZIcx+9Ny3ke/1JomCsDI1ocb11+sg==",
      "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",
      "integrity": "sha512-dtZvzc8BedpSaFNy75x6uiWwAGTH+aZHDtdrqP6qk+WcLJrfti6sGje1ZJ9UxyzDLF23d/mV+PaMwuC0hL7UVA==",
      "cpu": [
        "arm64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "win32"
      ]
    },
    "node_modules/@rollup/rollup-win32-ia32-msvc": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-ia32-msvc/-/rollup-win32-ia32-msvc-4.62.3.tgz",
      "integrity": "sha512-Rj8Ra4noo+aYy7sKBggCx0407mws34kAb1ySyWuq5DAtFBQdkSwnsjCgPrhPe9cvgBKZIukpE+CVHvORCS93kQ==",
      "cpu": [
        "ia32"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "win32"
      ]
    },
    "node_modules/@rollup/rollup-win32-x64-gnu": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-gnu/-/rollup-win32-x64-gnu-4.62.3.tgz",
      "integrity": "sha512-vp7N084ew/odXn2gi/mzm9mUkQu9l6AiN6dt4IeUM2Uvm9o+cVmP+YkqbMOteLbiGgqBBlJZjIMYVCfOOIVbVQ==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "win32"
      ]
    },
    "node_modules/@rollup/rollup-win32-x64-msvc": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-msvc/-/rollup-win32-x64-msvc-4.62.3.tgz",
      "integrity": "sha512-MOG/3gTOn4Fwf574RVOaY61I5o6P90legkFADiTyn1hyjNydT+cerU2rLUwPdZkKKyJ+iT+K9p7WXK4LM1Ka6g==",
      "cpu": [
        "x64"
      ],
      "license": "MIT",
      "optional": true,
      "os": [
        "win32"
      ]
    },
    "node_modules/@types/estree": {
      "version": "1.0.9",
      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
      "integrity": "sha512-GhdPgy1el4/ImP05X05Uw4cw2/M93BCUmnEvWZNStlCzEKME4Fkk+YpoA5OiHNQmoS7Cafb8Xa3Pya8m1Qrzeg==",
      "license": "MIT"
    },
    "node_modules/fsevents": {
      "version": "2.3.3",
      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
      "hasInstallScript": true,
      "license": "MIT",
      "optional": true,
      "os": [
        "darwin"
      ],
      "engines": {
        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
      }
    },
    "node_modules/rollup": {
      "version": "4.62.3",
      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.62.3.tgz",
      "integrity": "sha512-Gu0c0iH9FzgX1L1t7ByIbbS3Vmdz+6KHm/EsqmmC71gUQ82yvZRkTK6XzrFObSka91WUVdynqp6nsfilzr5k6Q==",
      "license": "MIT",
      "dependencies": {
        "@types/estree": "1.0.9"
      },
      "bin": {
        "rollup": "dist/bin/rollup"
      },
      "engines": {
        "node": ">=18.0.0",
        "npm": ">=8.0.0"
      },
      "optionalDependencies": {
        "@rollup/rollup-android-arm-eabi": "4.62.3",
        "@rollup/rollup-android-arm64": "4.62.3",
        "@rollup/rollup-darwin-arm64": "4.62.3",
        "@rollup/rollup-darwin-x64": "4.62.3",
        "@rollup/rollup-freebsd-arm64": "4.62.3",
        "@rollup/rollup-freebsd-x64": "4.62.3",
        "@rollup/rollup-linux-arm-gnueabihf": "4.62.3",
        "@rollup/rollup-linux-arm-musleabihf": "4.62.3",
        "@rollup/rollup-linux-arm64-gnu": "4.62.3",
        "@rollup/rollup-linux-arm64-musl": "4.62.3",
        "@rollup/rollup-linux-loong64-gnu": "4.62.3",
        "@rollup/rollup-linux-loong64-musl": "4.62.3",
        "@rollup/rollup-linux-ppc64-gnu": "4.62.3",
        "@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"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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.');