@babel/core 7.26.0: transformFileAsync

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 transformFileAsync in pkg:npm/%40babel/core@7.26.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.0
Demonstrate these symbols/APIs:
  - transformFileAsync
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.

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const secret = 42;

const message = ;

const message = "hello world";

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{
  "name": "sample-babel-transformfileasync",
  "version": "1.0.0",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.26.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify transformFileAsync in pkg:npm/%40babel/core@7.26.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.0"
  ],
  "symbols": [
    "transformFileAsync"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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

/**
 * Transforms a JavaScript file asynchronously using @babel/core.transformFileAsync.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Babel transform options.
 * @returns {Promise<object|null>} The transformation result.
 */
async function transformFileAsync(filename, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformFileAsync(filename, defaultOptions);
}

/**
 * Transforms a file asynchronously applying a custom AST visitor plugin.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} visitor - AST visitor map.
 * @param {object} [options={}] - Additional Babel options.
 * @returns {Promise<object|null>} The transformation result.
 */
async function transformFileWithVisitor(filename, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return transformFileAsync(filename, {
    plugins: [customPlugin],
    ...options
  });
}

/**
 * Transforms a file asynchronously with minified output.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Additional Babel options.
 * @returns {Promise<object|null>} The transformation result.
 */
async function transformFileMinified(filename, options = {}) {
  return transformFileAsync(filename, {
    minified: true,
    comments: false,
    ...options
  });
}

module.exports = {
  transformFileAsync,
  transformFileWithVisitor,
  transformFileMinified
};

const assert = require('assert');
const path = require('path');
const babel = require('@babel/core');
const {
  transformFileAsync,
  transformFileWithVisitor,
  transformFileMinified
} = require('../src/index');

const fixturesDir = path.join(__dirname, '..', 'fixtures');
const validFile = path.join(fixturesDir, 'valid.js');
const invalidFile = path.join(fixturesDir, 'invalid.js');
const ignoredFile = path.join(fixturesDir, 'ignored.js');
const nonExistentFile = path.join(fixturesDir, 'does-not-exist.js');

async function main() {
  // 1. transformFileAsync transforms JavaScript file and resolves with generated code string
  const result1 = await babel.transformFileAsync(validFile, { configFile: false, babelrc: false });
  assert(result1 !== null, 'Result should not be null');
  assert.strictEqual(typeof result1.code, 'string', 'Result must contain code string');
  assert(result1.code.includes('const message = "hello world";'), 'Generated code should match input file');

  // 2. transformFileAsync allows omitting options argument and resolves with generated code
  const result2 = await transformFileAsync(validFile);
  assert(result2 !== null, 'Result should not be null');
  assert.strictEqual(typeof result2.code, 'string', 'Result must contain code string');
  assert(result2.code.includes('const message = "hello world";'), 'Generated code should match input file');

  // 3. transformFileAsync applies custom AST visitor plugins to modify identifiers
  const result3 = await transformFileWithVisitor(
    validFile,
    {
      Identifier(p) {
        if (p.node.name === 'message') {
          p.node.name = 'greeting';
        }
      }
    }
  );
  assert(result3 !== null, 'Result should not be null');
  assert(result3.code.includes('const greeting = "hello world";'), 'Identifier must be renamed');
  assert(!result3.code.includes('const message ='), 'Original identifier must be absent');

  // 4. transformFileAsync generates a v3 source map when sourceMaps option is enabled
  const result4 = await babel.transformFileAsync(validFile, {
    configFile: false,
    babelrc: false,
    sourceMaps: true
  });
  assert(result4 !== null, 'Result should not be null');
  assert(result4.map !== null && typeof result4.map === 'object', 'Source map should be generated');
  assert.strictEqual(result4.map.version, 3, 'Source map version should be 3');
  assert(Array.isArray(result4.map.sources), 'Source map sources should be an array');
  assert.strictEqual(typeof result4.map.mappings, 'string', 'Source map mappings should be string');

  // 5. transformFileAsync returns AST File root node when ast option is set to true
  const result5 = await babel.transformFileAsync(validFile, {
    configFile: false,
    babelrc: false,
    ast: true
  });
  assert(result5 !== null, 'Result should not be null');
  assert(result5.ast !== null && typeof result5.ast === 'object', 'AST must be returned');
  assert.strictEqual(result5.ast.type, 'File', 'Root AST node must be File');
  assert.strictEqual(result5.ast.program.type, 'Program', 'AST must contain Program node');

  // 6. transformFileAsync minifies generated code when minified option is set to true
  const result6 = await transformFileMinified(validFile);
  assert(result6 !== null, 'Result should not be null');
  assert.strictEqual(typeof result6.code, 'string', 'Result must contain code string');
  assert(!result6.code.includes('\n'), 'Minified output should not contain newlines');
  assert(result6.code.includes('const message="hello world";'), 'Code should be minified');

  // 7. transformFileAsync resolves to null when target file matches ignore pattern
  const result7 = await babel.transformFileAsync(ignoredFile, {
    configFile: false,
    babelrc: false,
    ignore: ['**/ignored.js']
  });
  assert.strictEqual(result7, null, 'Ignored file transformation must yield null result');

  // 8. transformFileAsync rejects with ENOENT error when target file does not exist
  let enoentError = null;
  try {
    await babel.transformFileAsync(nonExistentFile, {
      configFile: false,
      babelrc: false
    });
  } catch (err) {
    enoentError = err;
  }
  assert(enoentError !== null, 'Non-existent file must reject with error');
  assert.strictEqual(enoentError.code, 'ENOENT', 'Error code must be ENOENT');

  // 9. transformFileAsync rejects with SyntaxError and BABEL_PARSE_ERROR code when file contains invalid syntax
  let syntaxError = null;
  try {
    await babel.transformFileAsync(invalidFile, {
      configFile: false,
      babelrc: false
    });
  } catch (err) {
    syntaxError = err;
  }
  assert(syntaxError !== null, 'Invalid syntax must reject with error');
  assert(syntaxError instanceof SyntaxError, 'Error should be an instance of SyntaxError');
  assert.strictEqual(syntaxError.code, 'BABEL_PARSE_ERROR', 'Error code should be BABEL_PARSE_ERROR');

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

main().catch((err) => {
  console.error('Contract failed:', err);
  process.exit(1);
});