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

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.0
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 message = "hello world";
function greet(name) {
  return message + " " + name;
}

const invalid = ;

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{
  "name": "sample-babel-transformfileasync",
  "version": "1.0.0",
  "description": "verify pkg:npm/%40babel/core@7.26.0",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.26.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/core@7.26.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.0"
  ],
  "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 source file asynchronously using @babel/core.transformFileAsync.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Babel options.
 * @returns {Promise<object|null>} Transformation result or null if ignored.
 */
function transformSourceFileAsync(filename, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformFileAsync(filename, defaultOptions);
}

/**
 * Transforms a source file asynchronously using a custom AST visitor plugin.
 *
 * @param {string} filename - Path to the file.
 * @param {object} visitor - AST visitor methods.
 * @returns {Promise<object|null>} Transformation result.
 */
function transformFileWithVisitorAsync(filename, visitor) {
  const plugin = () => ({ visitor });
  return transformSourceFileAsync(filename, {
    plugins: [plugin]
  });
}

/**
 * Transforms a source file asynchronously with source map generation enabled.
 *
 * @param {string} filename - Path to the file.
 * @returns {Promise<object|null>} Transformation result with map.
 */
function transformFileWithSourceMapAsync(filename) {
  return transformSourceFileAsync(filename, {
    sourceMaps: true
  });
}

/**
 * Transforms a source file asynchronously with AST returned.
 *
 * @param {string} filename - Path to the file.
 * @returns {Promise<object|null>} Transformation result with AST.
 */
function transformFileWithAstAsync(filename) {
  return transformSourceFileAsync(filename, {
    ast: true
  });
}

module.exports = {
  transformSourceFileAsync,
  transformFileWithVisitorAsync,
  transformFileWithSourceMapAsync,
  transformFileWithAstAsync
};

const assert = require('assert');
const path = require('path');
const {
  transformSourceFileAsync,
  transformFileWithVisitorAsync,
  transformFileWithSourceMapAsync,
  transformFileWithAstAsync
} = require('../src/index');

const fixtureFile = path.resolve(__dirname, '../fixtures/input.js');
const syntaxErrorFile = path.resolve(__dirname, '../fixtures/syntax-error.js');
const nonexistentFile = path.resolve(__dirname, '../fixtures/does-not-exist.js');

async function runContract() {
  // 1. transformFileAsync asynchronously transforms JavaScript source file and returns a Promise resolving to an object with generated code string
  {
    const result = await transformSourceFileAsync(fixtureFile);
    assert(result !== null, 'Result should not be null');
    assert.strictEqual(typeof result.code, 'string', 'Result must contain code string');
    assert(result.code.includes('hello world'), 'Transformed code must contain file content');
  }

  // 2. transformFileAsync applies custom plugin visitors asynchronously to modify AST identifiers in source file
  {
    const result = await transformFileWithVisitorAsync(fixtureFile, {
      Identifier(pathNode) {
        if (pathNode.node.name === 'message') {
          pathNode.node.name = 'greeting';
        }
      }
    });
    assert(result !== null, 'Result should not be null');
    assert(result.code.includes('greeting'), 'Identifier must be renamed by visitor');
    assert(!result.code.includes('message'), 'Original identifier should be replaced');
  }

  // 3. transformFileAsync generates source maps when sourceMaps option is enabled
  {
    const result = await transformFileWithSourceMapAsync(fixtureFile);
    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), 'Sources should be an array');
    assert.strictEqual(typeof result.map.mappings, 'string', 'Mappings should be a string');
  }

  // 4. transformFileAsync returns AST File root node when ast option is set to true
  {
    const result = await transformFileWithAstAsync(fixtureFile);
    assert(result !== null, 'Result should not be null');
    assert(result.ast !== null && typeof result.ast === 'object', 'AST must be returned');
    assert.strictEqual(result.ast.type, 'File', 'Root AST node must be File');
    assert.strictEqual(result.ast.program.type, 'Program', 'AST must have Program node');
  }

  // 5. transformFileAsync returns null when filename matches ignore pattern
  {
    const result = await transformSourceFileAsync(fixtureFile, {
      ignore: ['**/fixtures/input.js']
    });
    assert.strictEqual(result, null, 'Ignored file transformation must return null');
  }

  // 6. transformFileAsync rejects with ENOENT error when attempting to transform nonexistent file path
  {
    await assert.rejects(
      async () => {
        await transformSourceFileAsync(nonexistentFile);
      },
      (err) => {
        return err.code === 'ENOENT';
      },
      'Nonexistent file must reject with ENOENT error'
    );
  }

  // 7. transformFileAsync rejects with SyntaxError containing BABEL_PARSE_ERROR code when source file contains invalid JavaScript syntax
  {
    await assert.rejects(
      async () => {
        await transformSourceFileAsync(syntaxErrorFile);
      },
      (err) => {
        return err instanceof SyntaxError && err.code === 'BABEL_PARSE_ERROR';
      },
      'Invalid syntax in file must reject with SyntaxError containing BABEL_PARSE_ERROR code'
    );
  }

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

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