Ejemplo

@babel/core 7.26.10: parseSync

Muestra verificada para npm @babel/core 7.26.10: parseSync. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:9bc025b5fe9cd93231655d80a50a5446bf33ab3898f51f6c600c7784e75e68c3

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…	2026-09-07

Caso

HOW

Objetivo: verify @babel/core.parseSync in pkg:npm/%40babel/core@7.26.10
Paquetes: @babel/core 7.26.10
Símbolos: @babel/core.parseSync
Entorno: node 22.23.2
Creado: 2026-09-07T04:37:39Z

Contrato

parseSync parses JavaScript source code into an AST File node with Program body
parseSync returns File AST with default sourceType module and program body containing parsed statements
parseSync supports parserOpts plugins such as jsx to parse syntax extensions
parseSync populates tokens array when parserOpts.tokens is true
parseSync returns null when filename matches ignore pattern in options
parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax

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 @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.

csx.json

{"case":{"caseId":"case:sha256:81f6c3995305bafa73776ca91fe2ac2eaeb2785f45c9024b9a9349d085ef6847","constraints":{"executionContext":"node"},"contract":["parseSync parses JavaScript source code into an AST File node with Program body","parseSync returns File AST with default sourceType module and program body containing parsed statements","parseSync supports parserOpts plugins such as jsx to parse syntax extensions","parseSync populates tokens array when parserOpts.tokens is true","parseSync returns null when filename matches ignore pattern in options","parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax"],"goal":"verify @babel/core.parseSync in pkg:npm/%40babel/core@7.26.10","kind":"HOW","packages":["pkg:npm/%40babel/core@7.26.10"],"schemaVersion":1,"symbols":["@babel/core.parseSync"]},"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@7.26.10"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.26.10","symbols":["@babel/core.parseSync"],"verifierAdapter":"node-typescript@1"}

package-lock.json

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package.json

{
  "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"
}

spec.json

{
  "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"
  ]
}

src/index.js

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
};

test/contract.js

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.');

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