@babel/core 7.26.0: transformFile

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 transformFile 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:
  - transformFile

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:de9949ae2483d19c81a9170333c1833fb39773cbd6e1dabf01b1433326a8678e","contract":["transformFile asynchronously transforms JavaScript file and invokes callback with result containing generated code string","transformFile allows omitting options argument and invokes callback with generated code","transformFile applies custom AST visitor plugins to modify identifiers","transformFile generates a v3 source map when sourceMaps option is enabled","transformFile returns AST File root node when ast option is set to true","transformFile minifies generated code when minified option is set to true","transformFile yields null result when target file matches ignore pattern","transformFile yields an error with ENOENT code when target file does not exist","transformFile yields a SyntaxError with BABEL_PARSE_ERROR code when file contains invalid syntax"],"goal":"verify transformFile in pkg:npm/%40babel/core@7.26.0","kind":"HOW","packages":["pkg:npm/%40babel/core@7.26.0"],"schemaVersion":1,"symbols":["transformFile"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.26.0"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.26.0","symbols":["transformFile"],"verifierAdapter":"node-typescript@1"}

const secret = 42;

const message = ;

const message = "hello world";

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

{
  "schemaVersion": 1,
  "goal": "verify transformFile in pkg:npm/%40babel/core@7.26.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.0"
  ],
  "symbols": [
    "transformFile"
  ]
}

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

/**
 * Transforms a JavaScript file asynchronously using @babel/core.transformFile.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Babel transform options.
 * @param {Function} callback - Callback receiving (err, result).
 */
function transformFile(filename, options, callback) {
  if (typeof options === 'function') {
    callback = options;
    options = {};
  }
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformFile(filename, defaultOptions, callback);
}

/**
 * Promisified wrapper for transformFile.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Babel transform options.
 * @returns {Promise<object|null>} The transformation result.
 */
function transformFileAsync(filename, options = {}) {
  return new Promise((resolve, reject) => {
    transformFile(filename, options, (err, result) => {
      if (err) return reject(err);
      resolve(result);
    });
  });
}

/**
 * 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 {Function} callback - Callback receiving (err, result).
 */
function transformFileWithVisitor(filename, visitor, callback) {
  const customPlugin = () => ({
    visitor
  });
  return transformFile(filename, { plugins: [customPlugin] }, callback);
}

/**
 * Transforms a file asynchronously with minified output.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {Function} callback - Callback receiving (err, result).
 */
function transformFileMinified(filename, callback) {
  return transformFile(
    filename,
    {
      minified: true,
      comments: false
    },
    callback
  );
}

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

const assert = require('assert');
const path = require('path');
const babel = require('@babel/core');
const {
  transformFile,
  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. transformFile asynchronously transforms JavaScript file and invokes callback with result containing generated code string
  await new Promise((resolve, reject) => {
    babel.transformFile(validFile, { configFile: false, babelrc: false }, (err, result) => {
      if (err) return reject(err);
      try {
        assert(result !== null, 'Result should not be null');
        assert.strictEqual(typeof result.code, 'string', 'Result must contain code string');
        assert(result.code.includes('const message = "hello world";'), 'Generated code should match input file');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 2. transformFile allows omitting options argument and invokes callback with generated code
  await new Promise((resolve, reject) => {
    transformFile(validFile, (err, result) => {
      if (err) return reject(err);
      try {
        assert(result !== null, 'Result should not be null');
        assert.strictEqual(typeof result.code, 'string', 'Result must contain code string');
        assert(result.code.includes('const message = "hello world";'), 'Generated code should match input file');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 3. transformFile applies custom AST visitor plugins to modify identifiers
  await new Promise((resolve, reject) => {
    transformFileWithVisitor(
      validFile,
      {
        Identifier(p) {
          if (p.node.name === 'message') {
            p.node.name = 'greeting';
          }
        }
      },
      (err, result) => {
        if (err) return reject(err);
        try {
          assert(result !== null, 'Result should not be null');
          assert(result.code.includes('const greeting = "hello world";'), 'Identifier must be renamed');
          assert(!result.code.includes('const message ='), 'Original identifier must be absent');
          resolve();
        } catch (e) {
          reject(e);
        }
      }
    );
  });

  // 4. transformFile generates a v3 source map when sourceMaps option is enabled
  await new Promise((resolve, reject) => {
    babel.transformFile(validFile, { configFile: false, babelrc: false, sourceMaps: true }, (err, result) => {
      if (err) return reject(err);
      try {
        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.strictEqual(typeof result.map.mappings, 'string', 'Source map mappings should be string');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 5. transformFile returns AST File root node when ast option is set to true
  await new Promise((resolve, reject) => {
    babel.transformFile(validFile, { configFile: false, babelrc: false, ast: true }, (err, result) => {
      if (err) return reject(err);
      try {
        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 contain Program node');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 6. transformFile minifies generated code when minified option is set to true
  await new Promise((resolve, reject) => {
    transformFileMinified(validFile, (err, result) => {
      if (err) return reject(err);
      try {
        assert(result !== null, 'Result should not be null');
        assert.strictEqual(typeof result.code, 'string', 'Result must contain code string');
        assert(!result.code.includes('\n'), 'Minified output should not contain newlines');
        assert(result.code.includes('const message="hello world";'), 'Code should be minified');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 7. transformFile yields null result when target file matches ignore pattern
  await new Promise((resolve, reject) => {
    babel.transformFile(ignoredFile, { configFile: false, babelrc: false, ignore: ['**/ignored.js'] }, (err, result) => {
      if (err) return reject(err);
      try {
        assert.strictEqual(result, null, 'Ignored file transformation must yield null result');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 8. transformFile yields an error with ENOENT code when target file does not exist
  await new Promise((resolve, reject) => {
    babel.transformFile(nonExistentFile, { configFile: false, babelrc: false }, (err, result) => {
      try {
        assert(err !== null, 'Non-existent file must yield an error');
        assert.strictEqual(err.code, 'ENOENT', 'Error code must be ENOENT');
        assert.strictEqual(result, undefined, 'Result must be undefined on error');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 9. transformFile yields a SyntaxError with BABEL_PARSE_ERROR code when file contains invalid syntax
  await new Promise((resolve, reject) => {
    babel.transformFile(invalidFile, { configFile: false, babelrc: false }, (err, result) => {
      try {
        assert(err !== null, 'Invalid syntax must yield an error');
        assert(err instanceof SyntaxError, 'Error should be an instance of SyntaxError');
        assert.strictEqual(err.code, 'BABEL_PARSE_ERROR', 'Error code should be BABEL_PARSE_ERROR');
        assert.strictEqual(result, undefined, 'Result should be undefined on error');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 10. transformFileAsync resolves Promise with transformation result
  const asyncResult = await transformFileAsync(validFile);
  assert(asyncResult !== null, 'Async result should not be null');
  assert.strictEqual(typeof asyncResult.code, 'string', 'Async result must contain code string');

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

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