@babel/core 7.24.7: transformFromAstSync

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 transformFromAstSync in pkg:npm/%40babel/core@7.24.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.24.7
Demonstrate these symbols/APIs:
  - transformFromAstSync
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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{
  "name": "sample-babel-transformfromastsync",
  "version": "1.0.0",
  "description": "verify transformFromAstSync in pkg:npm/%40babel/core@7.24.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.24.7"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify transformFromAstSync in pkg:npm/%40babel/core@7.24.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.24.7"
  ],
  "symbols": [
    "transformFromAstSync"
  ],
  "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 an AST synchronously using @babel/core.transformFromAstSync.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} [code] - The optional source code corresponding to the AST.
 * @param {object} [options={}] - Optional Babel transform options.
 * @returns {object|null} The transformation result with code, map, and ast.
 */
function transformFromAst(ast, code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformFromAstSync(ast, code, defaultOptions);
}

/**
 * Transforms an AST synchronously with a custom visitor plugin.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} [code] - The optional source code.
 * @param {object} visitor - AST visitor map.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformation result.
 */
function transformFromAstWithVisitor(ast, code, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return transformFromAst(ast, code, {
    ...options,
    plugins: [customPlugin, ...(options.plugins || [])]
  });
}

/**
 * Transforms an AST synchronously and produces a source map.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} code - The source code to map back to.
 * @param {string} [filename='source.js'] - Virtual filename for source mapping.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformation result with source map.
 */
function transformFromAstWithSourceMap(ast, code, filename = 'source.js', options = {}) {
  return transformFromAst(ast, code, {
    ...options,
    filename,
    sourceMaps: true
  });
}

/**
 * Transforms an AST synchronously returning only the AST without code generation.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} [code] - The optional source code.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformation result with ast and null code.
 */
function transformFromAstOnly(ast, code, options = {}) {
  return transformFromAst(ast, code, {
    ...options,
    ast: true,
    code: false
  });
}

module.exports = {
  transformFromAst,
  transformFromAstWithVisitor,
  transformFromAstWithSourceMap,
  transformFromAstOnly
};

const assert = require('assert');
const babel = require('@babel/core');
const {
  transformFromAst,
  transformFromAstWithVisitor,
  transformFromAstWithSourceMap,
  transformFromAstOnly
} = require('../src/index');

// 1. transformFromAstSync synchronously transforms an AST into generated JavaScript code string
{
  const input = 'const x = 1 + 2;';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAst(ast, 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. transformFromAstSync applies custom plugin visitors synchronously to modify AST identifiers
{
  const input = 'const oldName = 42;';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAstWithVisitor(ast, 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. transformFromAstSync generates source maps when sourceMaps option is enabled
{
  const input = 'function add(a, b) { return a + b; }';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAstWithSourceMap(ast, 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. transformFromAstSync returns transformed AST when ast option is set to true and skips code when code option is false
{
  const input = 'const message = "hello";';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAstOnly(ast, input);
  assert(result !== null, 'Result should not be null');
  assert.strictEqual(result.code, null, 'Code should be null when code: false');
  assert(result.ast !== null && typeof result.ast === 'object', 'AST must be returned when ast: true');
  assert.strictEqual(result.ast.type, 'File', 'AST root node must be File');
  assert.strictEqual(result.ast.program.type, 'Program', 'AST must contain Program node');
}

// 5. transformFromAstSync returns null when filename matches ignore pattern
{
  const input = 'const ignored = true;';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAst(ast, input, {
    filename: 'ignored-file.js',
    ignore: [/ignored-file/]
  });
  assert.strictEqual(result, null, 'Ignored file transformation must return null');
}

// 6. transformFromAstSync throws an Error when ast argument is null or invalid
{
  assert.throws(
    () => {
      babel.transformFromAstSync(null);
    },
    (err) => {
      return err instanceof Error && err.message.includes('No AST given');
    },
    'Passing null AST must throw an Error with "No AST given"'
  );
  assert.throws(
    () => {
      babel.transformFromAstSync({ type: 'InvalidNodeType' });
    },
    (err) => {
      return err instanceof Error && err.message.includes('AST root must be a Program or File node');
    },
    'Passing invalid AST node type must throw an Error'
  );
}

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