@babel/core 7.26.10: parseSync

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.parseSync in pkg:npm/%40babel/core@7.26.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.10
Demonstrate these symbols/APIs:
  - @babel/core.parseSync

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-parsesync",
  "version": "1.0.0",
  "description": "verify @babel/core.parseSync in pkg:npm/%40babel/core@7.26.10",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.26.10"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.parseSync in pkg:npm/%40babel/core@7.26.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.10"
  ],
  "symbols": [
    "@babel/core.parseSync"
  ]
}

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

/**
 * Parses JavaScript source code synchronously using @babel/core.parseSync.
 *
 * @param {string} code - The source code to parse.
 * @param {object} [options={}] - Optional Babel configuration options.
 * @returns {object|null} The parsed AST or null if ignored.
 */
function parseCode(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.parseSync(code, defaultOptions);
}

/**
 * Parses JSX code using @babel/core.parseSync with jsx parser plugin.
 *
 * @param {string} code - The JSX source code to parse.
 * @returns {object|null} The parsed AST.
 */
function parseJsx(code) {
  return parseCode(code, {
    parserOpts: {
      plugins: ['jsx']
    }
  });
}

/**
 * Parses code and extracts lexical tokens.
 *
 * @param {string} code - The source code to tokenize and parse.
 * @returns {Array<object>} Array of AST tokens.
 */
function extractTokens(code) {
  const ast = parseCode(code, {
    parserOpts: {
      tokens: true
    }
  });
  return ast && ast.tokens ? ast.tokens : [];
}

module.exports = {
  parseCode,
  parseJsx,
  extractTokens
};

const assert = require('assert');
const babel = require('@babel/core');
const { parseCode, parseJsx, extractTokens } = require('../src/index');

// 1. parseSync parses JavaScript source code into an AST File node with Program body
{
  const ast = parseCode('const answer = 42;');
  assert(ast !== null, 'AST should not be null');
  assert.strictEqual(ast.type, 'File', 'Root node must be File');
  assert.strictEqual(ast.program.type, 'Program', 'Root node must contain a Program node');
  assert.strictEqual(ast.program.body.length, 1, 'Program body must contain 1 statement');
  assert.strictEqual(ast.program.body[0].type, 'VariableDeclaration');
  assert.strictEqual(ast.program.body[0].declarations[0].id.name, 'answer');
}

// 2. parseSync returns File AST with default sourceType module and program body containing parsed statements
{
  const ast = parseCode('export const name = example;');
  assert(ast !== null, 'AST should not be null');
  assert.strictEqual(ast.type, 'File');
  assert.strictEqual(ast.program.sourceType, 'module', 'Default sourceType must be module');
  assert.strictEqual(ast.program.body[0].type, 'ExportNamedDeclaration');
}

// 3. parseSync supports parserOpts plugins such as jsx to parse syntax extensions
{
  const ast = parseJsx('const element = <span className="greeting">Hello</span>;');
  assert(ast !== null, 'AST should not be null');
  assert.strictEqual(ast.type, 'File');
  assert.strictEqual(ast.program.body[0].type, 'VariableDeclaration');
  const init = ast.program.body[0].declarations[0].init;
  assert.strictEqual(init.type, 'JSXElement');
  assert.strictEqual(init.openingElement.name.name, 'span');
}

// 4. parseSync populates tokens array when parserOpts.tokens is true
{
  const tokens = extractTokens('let count = 0;');
  assert(Array.isArray(tokens), 'Tokens must be an array');
  assert(tokens.length > 0, 'Tokens array must not be empty');
  assert(tokens.some((t) => t.value === 'count' || (t.type && t.type.label === 'name')));
}

// 5. parseSync returns null when filename matches ignore pattern in options
{
  const result = parseCode('const ignored = true;', {
    filename: 'ignored-file.js',
    ignore: [/ignored-file/]
  });
  assert.strictEqual(result, null, 'Ignored file must return null AST');
}

// 6. parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax
{
  assert.throws(
    () => {
      parseCode('const invalid = ;');
    },
    (err) => {
      return err instanceof SyntaxError && err.code === 'BABEL_PARSE_ERROR';
    },
    'Invalid syntax must throw SyntaxError with BABEL_PARSE_ERROR code'
  );
}

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