@babel/core 7.29.7: 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@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
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",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.29.7"
  }
}

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

import assert from 'node:assert/strict';
import * as babel from '@babel/core';

// 1. parseSync is exported as a function
assert.equal(typeof babel.parseSync, 'function', 'babel.parseSync must be a function');

// 2. parseSync parses JavaScript source code into a File AST node with default sourceType module
{
  const code = 'export function add(a, b) { return a + b; }';
  const ast = babel.parseSync(code, {
    configFile: false,
    babelrc: false
  });

  assert.ok(ast, 'parseSync should return an AST node');
  assert.equal(ast.type, 'File', 'root AST node must be of type File');
  assert.equal(ast.program.type, 'Program', 'AST must have a Program node');
  assert.equal(ast.program.sourceType, 'module', 'default program sourceType should be module');
  assert.equal(ast.program.body.length, 1, 'program body should contain 1 statement');
  assert.equal(ast.program.body[0].type, 'ExportNamedDeclaration', 'first statement should be ExportNamedDeclaration');
  assert.equal(ast.program.body[0].declaration.id.name, 'add', 'function identifier should be add');
}

// 3. parseSync parses extended syntax such as JSX when parserOpts plugins are specified
{
  const jsxCode = 'const element = <div className="card">Hello World</div>;';
  const ast = babel.parseSync(jsxCode, {
    configFile: false,
    babelrc: false,
    parserOpts: {
      plugins: ['jsx']
    }
  });

  assert.ok(ast, 'parseSync should return AST for JSX code');
  const statement = ast.program.body[0];
  assert.equal(statement.type, 'VariableDeclaration', 'statement should be VariableDeclaration');
  const declarator = statement.declarations[0];
  assert.equal(declarator.init.type, 'JSXElement', 'expression init should be JSXElement');
  assert.equal(declarator.init.openingElement.name.name, 'div', 'JSX opening element name should be div');
}

// 4. parseSync populates tokens array with token metadata when parserOpts tokens is true
{
  const code = 'const answer = 42;';
  const ast = babel.parseSync(code, {
    configFile: false,
    babelrc: false,
    parserOpts: {
      tokens: true
    }
  });

  assert.ok(ast, 'parseSync should return AST');
  assert.ok(Array.isArray(ast.tokens), 'ast.tokens should be an array when parserOpts.tokens is true');
  assert.ok(ast.tokens.length >= 4, 'tokens array should contain tokens for declaration and eof');
  assert.ok(ast.tokens.some(t => t.value === 'answer'), 'tokens should include identifier answer');
  assert.ok(ast.tokens.some(t => t.value === 42 || t.value === '42'), 'tokens should include numeric literal 42');
  const lastToken = ast.tokens[ast.tokens.length - 1];
  assert.equal(lastToken.type.label, 'eof', 'last token should be eof');
}

// 5. parseSync with sourceType unambiguous detects module vs script
{
  const moduleCode = 'export const x = 10;';
  const moduleAst = babel.parseSync(moduleCode, {
    configFile: false,
    babelrc: false,
    sourceType: 'unambiguous'
  });
  assert.equal(moduleAst.program.sourceType, 'module', 'unambiguous sourceType with export should detect module');

  const scriptCode = 'const y = 20;';
  const scriptAst = babel.parseSync(scriptCode, {
    configFile: false,
    babelrc: false,
    sourceType: 'unambiguous'
  });
  assert.equal(scriptAst.program.sourceType, 'script', 'unambiguous sourceType without import/export should detect script');
}

// 6. parseSync returns null when filename matches ignore pattern in options
{
  const result = babel.parseSync('const x = 1;', {
    configFile: false,
    babelrc: false,
    filename: 'node_modules/example/index.js',
    ignore: ['node_modules/**']
  });

  assert.strictEqual(result, null, 'parseSync should return null when filename matches ignore pattern');
}

// 7. parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax
{
  assert.throws(
    () => {
      babel.parseSync('const invalid syntax = ;', {
        configFile: false,
        babelrc: false
      });
    },
    (err) => {
      return err instanceof SyntaxError && err.code === 'BABEL_PARSE_ERROR' && typeof err.loc === 'object';
    },
    'Invalid syntax must throw SyntaxError with BABEL_PARSE_ERROR code and location metadata'
  );
}

console.log('Contract tests passed successfully.');