CodeSampleX

Sample

@babel/core 7.24.7: parseAsync

Verified sample for npm @babel/core 7.24.7: parseAsync. The contract ran on node 22 · linux debian/x64 · docker and passed: parseAsync parses valid…

sha256:e679ea2266ed94dff35400e97922402ea188a9afd70689ec54668fb27e121341

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Case

HOW
Goal
verify parseAsync in pkg:npm/%40babel/core@7.24.7
Packages
Symbols
  • parseAsync
Environment
node 22.23.2
Created
2026-09-05T08:14:23Z

Contract

  1. parseAsync parses valid JavaScript source code and returns a File AST root node
  2. parseAsync allows omitting options argument and returns a Program AST with body statements
  3. parseAsync parses modern ECMAScript module syntax when sourceType is module
  4. parseAsync parses empty source code and yields an AST with empty program body
  5. parseAsync preserves source comments in the parsed AST result
  6. parseAsync supports parser plugins such as jsx via parserOpts
  7. parseAsync supports parser plugins such as typescript via parserOpts
  8. parseAsync rejects with SyntaxError and BABEL_PARSE_ERROR code on invalid syntax
  9. parseAsync rejects with SyntaxError when parsing JSX syntax without jsx parser plugin

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.js

Download the source artifact (tar.gz)

Source

PROMPT.md
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.
csx.json
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package-lock.json
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package.json
{
  "name": "sample-babel-parseasync",
  "version": "1.0.0",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.24.7"
  },
  "license": "MIT-0"
}
spec.json
{
  "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"
  }
}
src/index.js
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
};
test/contract.js
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);
});

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