@babel/core 7.26.10: transformAsync

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 @babel/core.transformAsync in pkg:npm/%40babel/core@7.26.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.10
Demonstrate these symbols/APIs:
  - @babel/core.transformAsync

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": "sample-babel-transformasync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.26.10",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.26.10"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.26.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.10"
  ],
  "symbols": [
    "@babel/core.transformAsync"
  ]
}

const babel = require('@babel/core');

/**
 * Transforms JavaScript code asynchronously using @babel/core.transformAsync.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Optional Babel transform options.
 * @returns {Promise<object|null>} A promise resolving to the transformation result.
 */
async function transformCodeAsync(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformAsync(code, defaultOptions);
}

/**
 * Transforms code asynchronously with a custom AST visitor plugin.
 *
 * @param {string} code - The source code to transform.
 * @param {object} visitor - AST visitor map.
 * @returns {Promise<object|null>} A promise resolving to the transformation result.
 */
async function transformWithVisitorAsync(code, visitor) {
  const customPlugin = () => ({
    visitor
  });
  return transformCodeAsync(code, {
    plugins: [customPlugin]
  });
}

/**
 * Transforms code asynchronously and produces a source map.
 *
 * @param {string} code - The source code to transform.
 * @param {string} [filename='source.js'] - Virtual filename for source mapping.
 * @returns {Promise<object|null>} A promise resolving to the transformation result with source map.
 */
async function transformWithSourceMapAsync(code, filename = 'source.js') {
  return transformCodeAsync(code, {
    filename,
    sourceMaps: true
  });
}

module.exports = {
  transformCodeAsync,
  transformWithVisitorAsync,
  transformWithSourceMapAsync
};

const assert = require('assert');
const babel = require('@babel/core');
const {
  transformCodeAsync,
  transformWithVisitorAsync,
  transformWithSourceMapAsync
} = require('../src/index');

(async () => {
  // 1. transformAsync asynchronously transforms JavaScript code and returns a Promise resolving to an object with generated code string
  {
    const input = 'const x = 1 + 2;';
    const result = await transformCodeAsync(input);
    assert(result !== null, 'Result should not be null');
    assert.strictEqual(typeof result.code, 'string', 'Result must contain code string');
    assert(result.code.includes('const x = 1 + 2;'), 'Transformed code should contain statement');
  }

  // 2. transformAsync applies custom plugin visitors asynchronously to modify AST identifiers
  {
    const input = 'const oldName = 42;';
    const result = await transformWithVisitorAsync(input, {
      Identifier(path) {
        if (path.node.name === 'oldName') {
          path.node.name = 'newName';
        }
      }
    });
    assert(result !== null, 'Result should not be null');
    assert(result.code.includes('const newName = 42;'), 'Identifier must be renamed');
    assert(!result.code.includes('oldName'), 'Old identifier should not be present');
  }

  // 3. transformAsync generates source maps when sourceMaps option is enabled
  {
    const input = 'function add(a, b) { return a + b; }';
    const result = await transformWithSourceMapAsync(input, 'calc.js');
    assert(result !== null, 'Result should not be null');
    assert(result.map !== null && typeof result.map === 'object', 'Source map should be generated');
    assert.strictEqual(result.map.version, 3, 'Source map version should be 3');
    assert(Array.isArray(result.map.sources), 'Source map sources should be an array');
    assert(result.map.sources.includes('calc.js'), 'Sources should include calc.js');
    assert.strictEqual(typeof result.map.mappings, 'string', 'Mappings should be a string');
  }

  // 4. transformAsync returns AST node when ast option is set to true and null when false
  {
    const input = 'const value = "hello";';
    const resultWithAst = await transformCodeAsync(input, { ast: true });
    assert(resultWithAst !== null, 'Result should not be null');
    assert(resultWithAst.ast !== null && typeof resultWithAst.ast === 'object', 'AST must be returned when ast: true');
    assert.strictEqual(resultWithAst.ast.type, 'File', 'AST root node must be File');
    assert.strictEqual(resultWithAst.ast.program.type, 'Program', 'AST must contain Program node');

    const resultWithoutAst = await transformCodeAsync(input, { ast: false });
    assert(resultWithoutAst !== null, 'Result should not be null');
    assert.strictEqual(resultWithoutAst.ast, null, 'AST must be null when ast: false');
  }

  // 5. transformAsync returns null when filename matches ignore pattern
  {
    const input = 'const skipped = true;';
    const result = await transformCodeAsync(input, {
      filename: 'ignored-file.js',
      ignore: [/ignored-file/]
    });
    assert.strictEqual(result, null, 'Ignored file transformation must return null');
  }

  // 6. transformAsync rejects with a SyntaxError having BABEL_PARSE_ERROR code when given invalid JavaScript syntax
  {
    let rejected = false;
    try {
      await transformCodeAsync('const broken = ;');
    } catch (err) {
      rejected = true;
      assert(err instanceof SyntaxError, 'Error must be an instance of SyntaxError');
      assert.strictEqual(err.code, 'BABEL_PARSE_ERROR', 'Error code must be BABEL_PARSE_ERROR');
    }
    assert(rejected, 'Invalid syntax must cause rejection');
  }

  // 7. transformAsync handles concurrent transformations independently via Promise.all
  {
    const inputs = [
      'const first = 10;',
      'const second = 20;',
      'const third = 30;'
    ];
    const results = await Promise.all(inputs.map((code) => transformCodeAsync(code)));
    assert.strictEqual(results.length, 3, 'Must return results for all inputs');
    results.forEach((res, idx) => {
      assert(res !== null, `Result ${idx} must not be null`);
      assert(res.code.includes(inputs[idx]), `Result ${idx} must contain input code`);
    });
  }

  console.log('All contract assertions passed successfully.');
})();