@babel/core 7.24.7: parseAsync

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 parseAsync 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:
  - parseAsync
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-parseasync",
  "version": "1.0.0",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.24.7"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify parseAsync in pkg:npm/%40babel/core@7.24.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.24.7"
  ],
  "symbols": [
    "parseAsync"
  ],
  "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');

/**
 * Parses JavaScript source code asynchronously using @babel/core.parseAsync.
 *
 * @param {string} code - Source code string to parse.
 * @param {object} [options={}] - Babel parsing options.
 * @returns {Promise<object|null>} AST root File node.
 */
async function parseCode(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.parseAsync(code, defaultOptions);
}

/**
 * Parses ECMAScript module source code asynchronously.
 *
 * @param {string} code - Source code string to parse.
 * @param {object} [options={}] - Additional Babel parsing options.
 * @returns {Promise<object|null>} AST root File node.
 */
async function parseModule(code, options = {}) {
  return parseCode(code, {
    sourceType: 'module',
    ...options
  });
}

/**
 * Parses source code asynchronously with specific Babel parser plugins.
 *
 * @param {string} code - Source code string to parse.
 * @param {string[]} plugins - Array of parser plugin names.
 * @param {object} [options={}] - Additional Babel parsing options.
 * @returns {Promise<object|null>} AST root File node.
 */
async function parseWithPlugins(code, plugins = [], options = {}) {
  const parserOpts = {
    plugins: [...plugins],
    ...(options.parserOpts || {})
  };
  return parseCode(code, {
    ...options,
    parserOpts
  });
}

module.exports = {
  parseAsync: babel.parseAsync,
  parseCode,
  parseModule,
  parseWithPlugins
};

const assert = require('assert');
const babel = require('@babel/core');
const {
  parseAsync,
  parseCode,
  parseModule,
  parseWithPlugins
} = require('../src/index');

async function main() {
  // 1. parseAsync parses valid JavaScript source code and returns a File AST root node
  {
    const code = 'const answer = 42;';
    const ast = await babel.parseAsync(code, { configFile: false, babelrc: false });
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    assert.strictEqual(ast.type, 'File', 'Root node must be File');
    assert(ast.program !== null && typeof ast.program === 'object', 'AST must contain program');
    assert.strictEqual(ast.program.type, 'Program', 'program type must be Program');
    assert.strictEqual(ast.program.body.length, 1, 'Program should have 1 statement');
    assert.strictEqual(ast.program.body[0].type, 'VariableDeclaration', 'First statement must be VariableDeclaration');
  }

  // 2. parseAsync allows omitting options argument and returns a Program AST with body statements
  {
    const code = 'function add(a, b) { return a + b; }';
    const ast = await parseAsync(code);
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    assert.strictEqual(ast.type, 'File', 'Root node must be File');
    assert.strictEqual(ast.program.type, 'Program', 'program type must be Program');
    assert.strictEqual(ast.program.body.length, 1, 'Program body should have 1 statement');
    assert.strictEqual(ast.program.body[0].type, 'FunctionDeclaration', 'Body item must be FunctionDeclaration');
    assert.strictEqual(ast.program.body[0].id.name, 'add', 'Function name should be add');
  }

  // 3. parseAsync parses modern ECMAScript module syntax when sourceType is module
  {
    const code = 'import { useState } from "react"; export const value = 100;';
    const ast = await parseModule(code);
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    assert.strictEqual(ast.program.sourceType, 'module', 'sourceType must be module');
    assert.strictEqual(ast.program.body.length, 2, 'Program should have 2 statements');
    assert.strictEqual(ast.program.body[0].type, 'ImportDeclaration', 'First statement must be ImportDeclaration');
    assert.strictEqual(ast.program.body[1].type, 'ExportNamedDeclaration', 'Second statement must be ExportNamedDeclaration');
  }

  // 4. parseAsync parses empty source code and yields an AST with empty program body
  {
    const ast = await parseCode('');
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    assert.strictEqual(ast.type, 'File', 'Root node must be File');
    assert.strictEqual(ast.program.type, 'Program', 'program type must be Program');
    assert.strictEqual(ast.program.body.length, 0, 'Program body must be empty');
  }

  // 5. parseAsync preserves source comments in the parsed AST result
  {
    const code = '// leading comment\nconst x = 10; /* trailing comment */';
    const ast = await parseCode(code);
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    assert(Array.isArray(ast.comments), 'comments should be an array');
    assert(ast.comments.length >= 2, 'AST should contain at least 2 comments');
    assert.strictEqual(ast.comments[0].value.trim(), 'leading comment', 'First comment value must match');
    assert.strictEqual(ast.comments[1].value.trim(), 'trailing comment', 'Second comment value must match');
  }

  // 6. parseAsync supports parser plugins such as jsx via parserOpts
  {
    const code = 'const element = <button className="btn">Click me</button>;';
    const ast = await parseWithPlugins(code, ['jsx']);
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    const decl = ast.program.body[0];
    assert.strictEqual(decl.type, 'VariableDeclaration', 'First statement must be VariableDeclaration');
    assert.strictEqual(decl.declarations[0].init.type, 'JSXElement', 'Variable init must be JSXElement');
  }

  // 7. parseAsync supports parser plugins such as typescript via parserOpts
  {
    const code = 'interface User { id: number; name: string; } const u: User = { id: 1, name: "test" };';
    const ast = await parseWithPlugins(code, ['typescript']);
    assert(ast !== null && typeof ast === 'object', 'AST must be non-null object');
    assert.strictEqual(ast.program.body[0].type, 'TSInterfaceDeclaration', 'First statement must be TSInterfaceDeclaration');
  }

  // 8. parseAsync rejects with SyntaxError and BABEL_PARSE_ERROR code on invalid syntax
  {
    const invalidCode = 'const let = ;;;';
    await assert.rejects(
      async () => {
        await parseCode(invalidCode);
      },
      (err) => {
        assert(err instanceof SyntaxError, 'Error must be instance of SyntaxError');
        assert.strictEqual(err.code, 'BABEL_PARSE_ERROR', 'Error code must be BABEL_PARSE_ERROR');
        return true;
      }
    );
  }

  // 9. parseAsync rejects with SyntaxError when parsing JSX syntax without jsx parser plugin
  {
    const jsxCode = 'const el = <div />;';
    await assert.rejects(
      async () => {
        await parseCode(jsxCode);
      },
      (err) => {
        assert(err instanceof SyntaxError, 'Error must be instance of SyntaxError');
        assert.strictEqual(err.code, 'BABEL_PARSE_ERROR', 'Error code must be BABEL_PARSE_ERROR');
        return true;
      }
    );
  }

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

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