@babel/core 7.24.7

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

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

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

/**
 * Synchronously parses code using @babel/core.parseSync.
 *
 * @param {string} code - Source code to parse.
 * @param {object} [options={}] - Options for babel.parseSync.
 * @returns {object|null} The parsed AST root node, or null if ignored.
 */
function parseCode(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.parseSync(code, defaultOptions);
}

/**
 * Synchronously parses an ES module.
 *
 * @param {string} code - Source code to parse.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The parsed AST root node.
 */
function parseModule(code, options = {}) {
  return parseCode(code, {
    sourceType: 'module',
    ...options
  });
}

/**
 * Synchronously parses a script.
 *
 * @param {string} code - Source code to parse.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The parsed AST root node.
 */
function parseScript(code, options = {}) {
  return parseCode(code, {
    sourceType: 'script',
    ...options
  });
}

/**
 * Synchronously parses code with custom parserOpts.
 *
 * @param {string} code - Source code to parse.
 * @param {object} parserOpts - Parser options passed to Babel.
 * @returns {object|null} The parsed AST root node.
 */
function parseWithParserOpts(code, parserOpts = {}) {
  return parseCode(code, {
    parserOpts
  });
}

/**
 * Parses code while testing ignore configuration.
 *
 * @param {string} code - Source code to parse.
 * @param {string} filename - Filename to check against ignore rules.
 * @param {Array<string>} ignorePatterns - Array of ignore patterns.
 * @returns {object|null} The parsed AST root node, or null if ignored.
 */
function parseWithIgnore(code, filename, ignorePatterns) {
  return parseCode(code, {
    filename,
    ignore: ignorePatterns
  });
}

module.exports = {
  parseCode,
  parseModule,
  parseScript,
  parseWithParserOpts,
  parseWithIgnore
};

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

const require = createRequire(import.meta.url);
const {
  parseCode,
  parseModule,
  parseScript,
  parseWithParserOpts,
  parseWithIgnore
} = require('../src/index.js');

// 1. parseSync is exported by @babel/core as a function and parses JavaScript code synchronously into an AST File root node with Program body
{
  assert.equal(typeof babel.parseSync, 'function', 'babel.parseSync must be exported as a function');
  const ast = parseCode('const answer = 42;');
  assert.ok(ast !== null && typeof ast === 'object', 'parseSync should return a non-null AST object');
  assert.equal(ast.type, 'File', 'Root AST node type must be File');
  assert.ok(ast.program && typeof ast.program === 'object', 'AST must have a program object');
  assert.equal(ast.program.type, 'Program', 'Program node type must be Program');
  assert.ok(Array.isArray(ast.program.body), 'Program body must be an array');
  assert.equal(ast.program.body.length, 1, 'Program body should have 1 statement');
  assert.equal(ast.program.body[0].type, 'VariableDeclaration', 'First statement must be VariableDeclaration');
}

// 2. parseSync parses ES module import and export declarations when sourceType is module
{
  const code = 'import { util } from "helper"; export const result = util();';
  const ast = parseModule(code);
  assert.ok(ast !== null, 'AST should not be null');
  assert.equal(ast.program.sourceType, 'module', 'sourceType should be module');
  assert.equal(ast.program.body.length, 2, 'Should contain two top-level statements');
  assert.equal(ast.program.body[0].type, 'ImportDeclaration', 'First statement must be ImportDeclaration');
  assert.equal(ast.program.body[0].source.value, 'helper', 'Import source value must match');
  assert.equal(ast.program.body[1].type, 'ExportNamedDeclaration', 'Second statement must be ExportNamedDeclaration');
}

// 3. parseSync parses script statements and directive prologues when sourceType is script
{
  const code = '"use strict"; var counter = 0;';
  const ast = parseScript(code);
  assert.ok(ast !== null, 'AST should not be null');
  assert.equal(ast.program.sourceType, 'script', 'sourceType should be script');
  assert.ok(Array.isArray(ast.program.directives), 'Directives must be an array');
  assert.equal(ast.program.directives.length, 1, 'Should contain 1 directive');
  assert.equal(ast.program.directives[0].value.value, 'use strict', 'Directive must be use strict');
  assert.equal(ast.program.body[0].type, 'VariableDeclaration', 'First statement must be VariableDeclaration');
}

// 4. parseSync parses modern ECMAScript features including optional chaining, nullish coalescing, and numeric separators
{
  const code = 'const value = target?.nested?.prop ?? 1_000_000;';
  const ast = parseCode(code);
  assert.ok(ast !== null, 'AST should not be null');
  const declaration = ast.program.body[0].declarations[0];
  assert.equal(declaration.init.type, 'LogicalExpression', 'Top init must be LogicalExpression for nullish coalescing');
  assert.equal(declaration.init.operator, '??', 'Operator must be ??');
  assert.equal(declaration.init.left.type, 'OptionalMemberExpression', 'Left operand must be OptionalMemberExpression');
  assert.equal(declaration.init.right.type, 'NumericLiteral', 'Right operand must be NumericLiteral');
  assert.equal(declaration.init.right.value, 1000000, 'Numeric separator literal value must be 1000000');
}

// 5. parseSync parses JSX syntax elements when jsx plugin is enabled in parserOpts
{
  const jsxCode = '<Button disabled={false}>Click me</Button>;';
  const ast = parseWithParserOpts(jsxCode, { plugins: ['jsx'] });
  assert.ok(ast !== null, 'AST should not be null');
  assert.equal(ast.program.body[0].type, 'ExpressionStatement', 'Statement must be ExpressionStatement');
  assert.equal(ast.program.body[0].expression.type, 'JSXElement', 'Expression must be JSXElement');
  assert.equal(ast.program.body[0].expression.openingElement.name.name, 'Button', 'JSX tag name must be Button');
}

// 6. parseSync returns null when filename matches configured ignore pattern
{
  const code = 'const ignoredConst = true;';
  const ignoredAst = parseWithIgnore(code, 'ignored-file.js', ['ignored-file.js']);
  assert.strictEqual(ignoredAst, null, 'parseSync must return null when filename matches ignore pattern');
  const normalAst = parseWithIgnore(code, 'allowed-file.js', ['ignored-file.js']);
  assert.ok(normalAst !== null, 'parseSync must return AST when filename does not match ignore pattern');
}

// 7. parseSync throws SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript 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.');