@vitest/mocker 4.1.11: 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 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:
  - collectModuleExports

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:sha256:77bb001305a66422c26b3327040621bb2ff84891713a0d7f102852d528606e94","contract":["@vitest/mocker package.json declares export mappings and version 4.1.11","@vitest/mocker/transforms exports collectModuleExports and initSyntaxLexers functions","initSyntaxLexers initializes WebAssembly syntax lexers successfully","collectModuleExports extracts named and default exports from ECMAScript module syntax","collectModuleExports extracts named exports and re-exports from CommonJS module syntax","collectModuleExports returns an empty array for module code with no exports","collectModuleExports appends discovered exports to an existing exports accumulator array without duplicates","collectModuleExports deduplicates exported identifier names"],"goal":"verify collectModuleExports in pkg:npm/%40vitest/mocker@4.1.11","kind":"HOW","packages":["pkg:npm/%40vitest/mocker@4.1.11"],"schemaVersion":1,"symbols":["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":["collectModuleExports"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-vitest-mocker-collect-module-exports",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vitest-mocker-collect-module-exports",
      "version": "1.0.0",
      "license": "MIT-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-collect-module-exports",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@vitest/mocker": "4.1.11"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify collectModuleExports in pkg:npm/%40vitest/mocker@4.1.11",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40vitest/mocker@4.1.11"
  ],
  "symbols": [
    "collectModuleExports"
  ]
}

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

const require = createRequire(import.meta.url);

// Contract 1: @vitest/mocker package.json declares export mappings and version 4.1.11
{
  const pkgJsonPath = require.resolve('@vitest/mocker/package.json');
  assert.ok(fs.existsSync(pkgJsonPath));
  const pkgJson = JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8'));
  assert.strictEqual(pkgJson.name, '@vitest/mocker');
  assert.strictEqual(pkgJson.version, '4.1.11');
  assert.ok(pkgJson.exports && pkgJson.exports['./transforms']);
}

// Contract 2: @vitest/mocker/transforms exports collectModuleExports and initSyntaxLexers functions
{
  assert.strictEqual(typeof collectModuleExports, 'function');
  assert.strictEqual(typeof initSyntaxLexers, 'function');
}

// Contract 3: initSyntaxLexers initializes WebAssembly syntax lexers successfully
{
  await initSyntaxLexers();
}

// Contract 4: collectModuleExports extracts named and default exports from ECMAScript module syntax
{
  const esmCode = `
    export const PI = 3.14159;
    export let count = 0;
    export function compute() { return 42; }
    export class Service {}
    const internalValue = 'test';
    export { internalValue as aliasValue };
    export default function main() {}
  `;
  const exportsList = collectModuleExports('sample-module.mjs', esmCode, 'module');
  assert.ok(Array.isArray(exportsList));
  assert.deepStrictEqual(exportsList.sort(), ['PI', 'Service', 'aliasValue', 'compute', 'count', 'default'].sort());
}

// Contract 5: collectModuleExports extracts named exports and re-exports from CommonJS module syntax
{
  const cjsCode = `
    exports.alpha = 1;
    module.exports.beta = 2;
    Object.defineProperty(exports, 'gamma', { value: 3 });
    Object.defineProperty(module.exports, 'delta', { value: 4 });
  `;
  const exportsList = collectModuleExports('sample-module.cjs', cjsCode, 'commonjs');
  assert.ok(Array.isArray(exportsList));
  assert.deepStrictEqual(exportsList.sort(), ['alpha', 'beta', 'delta', 'gamma'].sort());
}

// Contract 6: collectModuleExports returns an empty array for module code with no exports
{
  const noExportsEsm = `
    const a = 1;
    const b = 2;
    function helper() { return a + b; }
  `;
  const esmResult = collectModuleExports('no-exports.mjs', noExportsEsm, 'module');
  assert.deepStrictEqual(esmResult, []);

  const noExportsCjs = `
    const x = 10;
    console.log(x);
  `;
  const cjsResult = collectModuleExports('no-exports.cjs', noExportsCjs, 'commonjs');
  assert.deepStrictEqual(cjsResult, []);
}

// Contract 7: collectModuleExports appends discovered exports to an existing exports accumulator array without duplicates
{
  const initialAccumulator = ['existingExport'];
  const code = `export const extraExport = 'ok';`;
  const result = collectModuleExports('accum.mjs', code, 'module', initialAccumulator);
  assert.deepStrictEqual(result.sort(), ['existingExport', 'extraExport'].sort());
}

// Contract 8: collectModuleExports deduplicates exported identifier names
{
  const duplicateAccumulator = ['dup', 'dup'];
  const code = `export const dup = 1;`;
  const result = collectModuleExports('dup.mjs', code, 'module', duplicateAccumulator);
  assert.deepStrictEqual(result, ['dup']);
}

console.log('All @vitest/mocker collectModuleExports contract tests passed.');