@vitest/mocker 4.1.11: transforms.collectModuleExports

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 @vitest/mocker/transforms.collectModuleExports in pkg:npm/%40vitest/mocker@4.1.11
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40vitest/mocker@4.1.11
Demonstrate these symbols/APIs:
  - @vitest/mocker/transforms.collectModuleExports
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:eb7d5ae56caf89171a0656ad9a094459c5fbadbd6c5c70acbdaed9362fcf9704","constraints":{"executionContext":"node"},"contract":["initSyntaxLexers initializes WebAssembly lexers for ESM and CJS parsing","collectModuleExports parses named variables, functions, and class declarations in ESM code","collectModuleExports parses default export in ESM code","collectModuleExports parses renamed and aliased exports in ESM code","collectModuleExports parses destructured variable exports in ESM code","collectModuleExports parses CJS exports assigned to exports object and module.exports properties","collectModuleExports parses CJS exports defined via Object.defineProperty on exports","collectModuleExports appends to an optional existing exports array and returns deduplicated list","collectModuleExports returns empty array for modules with no exports"],"goal":"verify @vitest/mocker/transforms.collectModuleExports in pkg:npm/%40vitest/mocker@4.1.11","kind":"HOW","packages":["pkg:npm/%40vitest/mocker@4.1.11"],"schemaVersion":1,"symbols":["@vitest/mocker/transforms.collectModuleExports"]},"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/%40vitest/mocker@4.1.11"],"schemaVersion":1,"subject":"pkg:npm/%40vitest/mocker@4.1.11","symbols":["@vitest/mocker/transforms.collectModuleExports"],"verifierAdapter":"node-typescript@1"}

export { collectModuleExports, initSyntaxLexers } from '@vitest/mocker/transforms';

{
  "name": "sample-vitest-mocker-transforms",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vitest-mocker-transforms",
      "version": "1.0.0",
      "dependencies": {
        "@vitest/mocker": "4.1.11"
      }
    },
    "node_modules/@jridgewell/sourcemap-codec": {
      "version": "1.6.0",
      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
      "license": "MIT"
    },
    "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/@vitest/mocker": {
      "version": "4.1.11",
      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.1.11.tgz",
      "integrity": "sha512-2XJVD55d1o5AZous5CCGKS74g/riOj9odEt2bQpCVZeblHyHdnMeFl4jl0XjU21stf4mbjUkew2eXQZt65g5CQ==",
      "license": "MIT",
      "dependencies": {
        "@vitest/spy": "4.1.11",
        "estree-walker": "^3.0.3",
        "magic-string": "^0.30.21"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      },
      "peerDependencies": {
        "msw": "^2.4.9",
        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
      },
      "peerDependenciesMeta": {
        "msw": {
          "optional": true
        },
        "vite": {
          "optional": true
        }
      }
    },
    "node_modules/@vitest/spy": {
      "version": "4.1.11",
      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-4.1.11.tgz",
      "integrity": "sha512-apNa/prQy2qCeywhnixOHPRCgGNhvg7T4Dapfl1GahLp/R+uhBm5cPyFoNVyqsNd2h1nJxL6BqqdIjiABL60YA==",
      "license": "MIT",
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    },
    "node_modules/estree-walker": {
      "version": "3.0.3",
      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
      "integrity": "sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g==",
      "license": "MIT",
      "dependencies": {
        "@types/estree": "^1.0.0"
      }
    },
    "node_modules/magic-string": {
      "version": "0.30.21",
      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",
      "integrity": "sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==",
      "license": "MIT",
      "dependencies": {
        "@jridgewell/sourcemap-codec": "^1.5.5"
      }
    }
  }
}

{
  "name": "sample-vitest-mocker-transforms",
  "version": "1.0.0",
  "description": "Clean-room verification sample for @vitest/mocker transforms",
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@vitest/mocker": "4.1.11"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @vitest/mocker/transforms.collectModuleExports in pkg:npm/%40vitest/mocker@4.1.11",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40vitest/mocker@4.1.11"
  ],
  "symbols": [
    "@vitest/mocker/transforms.collectModuleExports"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { collectModuleExports, initSyntaxLexers } from '@vitest/mocker/transforms';

// 1. initSyntaxLexers initializes WebAssembly lexers for ESM and CJS parsing
{
  const result = await initSyntaxLexers();
  assert.equal(result, undefined);
}

// 2. collectModuleExports parses named variables, functions, and class declarations in ESM code
{
  const code = `
    export const name = 'sample';
    export let count = 10;
    export var flag = true;
    export function computeSum(a, b) { return a + b; }
    export async function fetchData() { return null; }
    export class Calculator {}
  `;
  const exports = collectModuleExports('example.mjs', code, 'module');
  assert.deepEqual(exports, ['name', 'count', 'flag', 'computeSum', 'fetchData', 'Calculator']);
}

// 3. collectModuleExports parses default export in ESM code
{
  const code = `
    export default function main() {}
  `;
  const exports = collectModuleExports('entry.mjs', code, 'module');
  assert.deepEqual(exports, ['default']);
}

// 4. collectModuleExports parses renamed and aliased exports in ESM code
{
  const code = `
    const internalA = 1;
    const internalB = 2;
    export { internalA, internalB as publicB };
  `;
  const exports = collectModuleExports('aliases.mjs', code, 'module');
  assert.deepEqual(exports, ['internalA', 'publicB']);
}

// 5. collectModuleExports parses destructured variable exports in ESM code
{
  const code = `
    export const { alpha, beta } = { alpha: 1, beta: 2 };
    export const [first, second] = [10, 20];
  `;
  const exports = collectModuleExports('destructure.mjs', code, 'module');
  assert.deepEqual(exports, ['alpha', 'beta', 'first', 'second']);
}

// 6. collectModuleExports parses CJS exports assigned to exports object and module.exports properties
{
  const code = `
    exports.alpha = 1;
    exports.beta = function() {};
    module.exports.gamma = 'test';
  `;
  const exports = collectModuleExports('commonjs-module.cjs', code, 'commonjs');
  assert.deepEqual(exports, ['alpha', 'beta', 'gamma']);
}

// 7. collectModuleExports parses CJS exports defined via Object.defineProperty on exports
{
  const code = `
    Object.defineProperty(exports, 'definedProp', {
      value: 42,
      enumerable: true
    });
  `;
  const exports = collectModuleExports('defined.cjs', code, 'commonjs');
  assert.deepEqual(exports, ['definedProp']);
}

// 8. collectModuleExports appends to an optional existing exports array and returns deduplicated list
{
  const code = `
    export const newExport = 'value';
    export const duplicate = 1;
  `;
  const initial = ['preset', 'duplicate'];
  const exports = collectModuleExports('accumulate.mjs', code, 'module', initial);
  assert.deepEqual(exports, ['preset', 'duplicate', 'newExport']);
  assert.deepEqual(initial, ['preset', 'duplicate', 'newExport', 'duplicate']);
}

// 9. collectModuleExports returns empty array for modules with no exports
{
  const esmEmpty = collectModuleExports('empty.mjs', 'const x = 1;', 'module');
  assert.deepEqual(esmEmpty, []);

  const cjsEmpty = collectModuleExports('empty.cjs', 'const y = 2;', 'commonjs');
  assert.deepEqual(cjsEmpty, []);
}

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