CodeSampleX

Ejemplo

@babel/core 7.24.7: parseAsync

Muestra verificada para npm @babel/core 7.24.7: parseAsync. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:a35da823a1c13984e9a3c8840481dc601234035ac43cc6ea4573f9a6f91a8a5b

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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

Caso

HOW
Objetivo
verify pkg:npm/%40babel/core@7.24.7
Paquetes
Símbolos
  • @babel/core.parseAsync
Entorno
node 22.23.2
Creado
2026-09-05T08:11:22Z

Contrato

  1. parseAsync parses JavaScript source code asynchronously into an AST File node with Program body
  2. parseAsync returns File AST with default sourceType module and program body containing parsed statements
  3. parseAsync supports parserOpts plugins such as jsx to parse syntax extensions asynchronously
  4. parseAsync populates tokens array when parserOpts.tokens is true
  5. parseAsync returns null when filename matches ignore pattern in options
  6. parseAsync rejects with a SyntaxError having BABEL_PARSE_ERROR code on invalid syntax
  7. parseAsync handles concurrent parse operations independently via Promise.all

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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 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:
  - @babel/core.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
{"case":{"caseId":"case:sha256:822abc9b49725fd9bb3356f728f5ec576b1534960a90f4a1c3d8bf0d685b2f2c","constraints":{"executionContext":"node"},"contract":["parseAsync parses JavaScript source code asynchronously into an AST File node with Program body","parseAsync returns File AST with default sourceType module and program body containing parsed statements","parseAsync supports parserOpts plugins such as jsx to parse syntax extensions asynchronously","parseAsync populates tokens array when parserOpts.tokens is true","parseAsync returns null when filename matches ignore pattern in options","parseAsync rejects with a SyntaxError having BABEL_PARSE_ERROR code on invalid syntax","parseAsync handles concurrent parse operations independently via Promise.all"],"goal":"verify pkg:npm/%40babel/core@7.24.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.24.7"],"schemaVersion":1,"symbols":["@babel/core.parseAsync"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.24.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.24.7","symbols":["@babel/core.parseAsync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-parseasync",
  "version": "1.0.0",
  "description": "verify @babel/core.parseAsync in pkg:npm/%40babel/core@7.24.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.24.7"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/core@7.24.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.24.7"
  ],
  "symbols": [
    "@babel/core.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 - The source code to parse.
 * @param {object} [options={}] - Optional Babel configuration options.
 * @returns {Promise<object|null>} The parsed AST or null if ignored.
 */
async function parseCodeAsync(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.parseAsync(code, defaultOptions);
}

/**
 * Parses JSX code asynchronously using @babel/core.parseAsync with jsx parser plugin.
 *
 * @param {string} code - The JSX source code to parse.
 * @returns {Promise<object|null>} The parsed AST.
 */
async function parseJsxAsync(code) {
  return parseCodeAsync(code, {
    parserOpts: {
      plugins: ['jsx']
    }
  });
}

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

module.exports = {
  parseCodeAsync,
  parseJsxAsync,
  extractTokensAsync
};
test/contract.js
const assert = require('assert');
const babel = require('@babel/core');
const { parseCodeAsync, parseJsxAsync, extractTokensAsync } = require('../src/index');

(async () => {
  // 1. parseAsync parses JavaScript source code asynchronously into an AST File node with Program body
  {
    const ast = await parseCodeAsync('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. parseAsync returns File AST with default sourceType module and program body containing parsed statements
  {
    const ast = await parseCodeAsync('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. parseAsync supports parserOpts plugins such as jsx to parse syntax extensions asynchronously
  {
    const ast = await parseJsxAsync('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. parseAsync populates tokens array when parserOpts.tokens is true
  {
    const tokens = await extractTokensAsync('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. parseAsync returns null when filename matches ignore pattern in options
  {
    const result = await parseCodeAsync('const ignored = true;', {
      filename: 'ignored-file.js',
      ignore: [/ignored-file/]
    });
    assert.strictEqual(result, null, 'Ignored file must return null AST');
  }

  // 6. parseAsync rejects with a SyntaxError having BABEL_PARSE_ERROR code on invalid syntax
  {
    let rejected = false;
    try {
      await parseCodeAsync('const invalid = ;');
    } catch (err) {
      rejected = true;
      assert(err instanceof SyntaxError, 'Error must be an instance of SyntaxError');
      assert.strictEqual(err.code, 'BABEL_PARSE_ERROR', 'Error code must be BABEL_PARSE_ERROR');
    }
    assert(rejected, 'Invalid syntax must cause rejection');
  }

  // 7. parseAsync handles concurrent parse operations independently via Promise.all
  {
    const inputs = [
      'const a = 1;',
      'const b = 2;',
      'const c = 3;'
    ];
    const results = await Promise.all(inputs.map((code) => parseCodeAsync(code)));
    assert.strictEqual(results.length, 3, 'Must return results for all inputs');
    results.forEach((ast, idx) => {
      assert(ast !== null, `Result ${idx} must not be null`);
      assert.strictEqual(ast.program.body[0].declarations[0].init.value, idx + 1);
    });
  }

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

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