@babel/core 7.29.7: transformFromAstAsync

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.transformFromAstAsync in pkg:npm/%40babel/core@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
Demonstrate these symbols/APIs:
  - @babel/core.transformFromAstAsync

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-core-transform-from-ast-async",
  "version": "1.0.0",
  "description": "verify @babel/core.transformFromAstAsync in pkg:npm/%40babel/core@7.29.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.29.7"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.transformFromAstAsync in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.transformFromAstAsync"
  ]
}

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

/**
 * Asynchronously transforms a Babel AST node into code and metadata.
 *
 * @param {object} ast - The Babel File or Program AST node.
 * @param {string} [code] - Optional source code corresponding to the AST.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result object.
 */
async function transformAst(ast, code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return await babel.transformFromAstAsync(ast, code, defaultOptions);
}

/**
 * Transforms an AST using a custom visitor plugin.
 *
 * @param {object} ast - The Babel AST node.
 * @param {object} visitor - AST visitor methods.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result.
 */
async function transformAstWithVisitor(ast, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return await transformAst(ast, undefined, {
    plugins: [customPlugin],
    ...options
  });
}

/**
 * Transforms an AST and generates source maps.
 *
 * @param {object} ast - The Babel AST node.
 * @param {string} [filename='source.js'] - Virtual source filename.
 * @param {string} [code] - Optional source code.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to result containing map.
 */
async function transformAstWithSourceMap(ast, filename = 'source.js', code, options = {}) {
  return await transformAst(ast, code, {
    filename,
    sourceMaps: true,
    ...options
  });
}

/**
 * Transforms an AST and returns the transformed AST structure in the result.
 *
 * @param {object} ast - The Babel AST node.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to result containing ast.
 */
async function transformAstWithOutputAst(ast, options = {}) {
  return await transformAst(ast, undefined, {
    ast: true,
    ...options
  });
}

/**
 * Transforms an AST in place without cloning the input AST.
 *
 * @param {object} ast - The Babel AST node to mutate in place.
 * @param {object} visitor - AST visitor methods.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result.
 */
async function transformAstInPlace(ast, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return await transformAst(ast, undefined, {
    cloneInputAst: false,
    plugins: [customPlugin],
    ...options
  });
}

/**
 * Checks whether the provided AST and options evaluate to ignored (null).
 *
 * @param {object} ast - The Babel AST node.
 * @param {object} options - Options containing ignore patterns and filename.
 * @returns {Promise<boolean>} Promise resolving to true if ignored.
 */
async function isIgnored(ast, options = {}) {
  const result = await transformAst(ast, undefined, options);
  return result === null;
}

module.exports = {
  transformAst,
  transformAstWithVisitor,
  transformAstWithSourceMap,
  transformAstWithOutputAst,
  transformAstInPlace,
  isIgnored
};

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import * as babel from '@babel/core';

const require = createRequire(import.meta.url);
const {
  transformAst,
  transformAstWithVisitor,
  transformAstWithSourceMap,
  transformAstWithOutputAst,
  transformAstInPlace,
  isIgnored
} = require('../src/index.js');

async function runContracts() {
  // 1. transformFromAstAsync is exported by @babel/core as an async function and resolves to a transformation result object with code string
  {
    assert.equal(typeof babel.transformFromAstAsync, 'function', 'babel.transformFromAstAsync must be exported as a function');
    const ast = babel.parseSync('const message = "hello";', {
      configFile: false,
      babelrc: false
    });
    assert.ok(ast !== null, 'parseSync should return AST');
    const result = await babel.transformFromAstAsync(ast, 'const message = "hello";', {
      configFile: false,
      babelrc: false
    });
    assert.ok(result !== null, 'transformFromAstAsync should resolve to an object');
    assert.equal(typeof result, 'object', 'Result must be an object');
    assert.equal(typeof result.code, 'string', 'Result must contain code string');
    assert.ok(result.code.includes('const message = "hello";'), 'Code should match input declaration');
  }

  // 2. transformAst helper transforms AST asynchronously and generates valid JavaScript code string
  {
    const ast = babel.parseSync('const sum = (a, b) => a + b;', {
      configFile: false,
      babelrc: false
    });
    const result = await transformAst(ast);
    assert.ok(result !== null, 'transformAst must return a non-null result');
    assert.equal(typeof result.code, 'string', 'Transformed result must contain code');
    assert.ok(result.code.includes('sum'), 'Transformed code must contain identifier');
  }

  // 3. transformFromAstAsync applies custom plugin visitors to modify AST nodes during transformation
  {
    const ast = babel.parseSync('const oldValue = 42;', {
      configFile: false,
      babelrc: false
    });
    const result = await transformAstWithVisitor(ast, {
      Identifier(path) {
        if (path.node.name === 'oldValue') {
          path.node.name = 'newValue';
        }
      }
    });
    assert.ok(result !== null, 'Result should not be null');
    assert.ok(result.code.includes('newValue'), 'Transformed code must contain modified identifier');
    assert.ok(!result.code.includes('oldValue'), 'Original identifier must be replaced');
  }

  // 4. transformFromAstAsync generates source maps with version, sources, and mappings when sourceMaps is enabled
  {
    const sourceCode = 'function multiply(x, y) { return x * y; }';
    const ast = babel.parseSync(sourceCode, {
      configFile: false,
      babelrc: false
    });
    const result = await transformAstWithSourceMap(ast, 'math.js', sourceCode);
    assert.ok(result !== null, 'Result should not be null');
    assert.ok(result.map !== null && typeof result.map === 'object', 'Source map must be an object');
    assert.equal(result.map.version, 3, 'Source map version must be 3');
    assert.ok(Array.isArray(result.map.sources), 'Source map sources must be an array');
    assert.ok(result.map.sources.includes('math.js'), 'Sources must include math.js');
    assert.equal(typeof result.map.mappings, 'string', 'Mappings must be a string');
  }

  // 5. transformFromAstAsync returns AST node with File root type when ast is enabled and defaults result.ast to null
  {
    const ast = babel.parseSync('let count = 0;', {
      configFile: false,
      babelrc: false
    });
    const defaultResult = await transformAst(ast);
    assert.equal(defaultResult.ast, null, 'Default result.ast must be null');

    const resultWithAst = await transformAstWithOutputAst(ast);
    assert.ok(resultWithAst !== null, 'Result should not be null');
    assert.ok(resultWithAst.ast !== null && typeof resultWithAst.ast === 'object', 'ast must be an object');
    assert.equal(resultWithAst.ast.type, 'File', 'Root AST type must be File');
    assert.ok(resultWithAst.ast.program !== null, 'Program node must exist');
    assert.equal(resultWithAst.ast.program.type, 'Program', 'AST program type must be Program');
    assert.ok(Array.isArray(resultWithAst.ast.program.body), 'Program body must be an array');
  }

  // 6. transformFromAstAsync preserves input AST by default and mutates it in place when cloneInputAst is false
  {
    const astPreserved = babel.parseSync('let counter = 1;', {
      configFile: false,
      babelrc: false
    });
    await transformAstWithVisitor(astPreserved, {
      VariableDeclaration(path) {
        path.node.kind = 'const';
      }
    });
    assert.equal(astPreserved.program.body[0].kind, 'let', 'Input AST must remain unchanged when cloneInputAst defaults to true');

    const astMutated = babel.parseSync('let counter = 1;', {
      configFile: false,
      babelrc: false
    });
    await transformAstInPlace(astMutated, {
      VariableDeclaration(path) {
        path.node.kind = 'const';
      }
    });
    assert.equal(astMutated.program.body[0].kind, 'const', 'Input AST must be mutated in place when cloneInputAst is false');
  }

  // 7. transformFromAstAsync returns null when filename matches configured ignore pattern
  {
    const ast = babel.parseSync('const secretKey = "hidden";', {
      configFile: false,
      babelrc: false
    });
    const ignored = await isIgnored(ast, {
      filename: '/workspace/test/ignored-sample.js',
      ignore: ['/workspace/test/ignored-sample.js']
    });
    assert.equal(ignored, true, 'isIgnored must return true for ignored filename');

    const directResult = await babel.transformFromAstAsync(ast, undefined, {
      configFile: false,
      babelrc: false,
      filename: '/workspace/test/ignored-sample.js',
      ignore: ['/workspace/test/ignored-sample.js']
    });
    assert.equal(directResult, null, 'Direct transformFromAstAsync must return null for ignored file');
  }

  // 8. transformFromAstAsync supports asynchronous plugin factory functions resolving to visitor plugins
  {
    const ast = babel.parseSync('let pending = true;', {
      configFile: false,
      babelrc: false
    });
    const asyncPlugin = async () => {
      await new Promise((res) => setTimeout(res, 5));
      return {
        visitor: {
          Identifier(path) {
            if (path.node.name === 'pending') {
              path.node.name = 'resolved';
            }
          }
        }
      };
    };

    const result = await transformAst(ast, undefined, {
      plugins: [asyncPlugin]
    });
    assert.ok(result !== null, 'Async plugin transform must not be null');
    assert.ok(result.code.includes('resolved'), 'Async visitor transformation must be applied');
    assert.ok(!result.code.includes('pending'), 'Original identifier should not remain');
  }

  console.log('All @babel/core.transformFromAstAsync contract tests passed successfully.');
}

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