CodeSampleX

Ejemplo

@babel/core 7.24.7

Muestra verificada para npm @babel/core 7.24.7. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó: parseSync is exported by @babel/core as…

sha256:e6d87d2e3d6f438e5f8713d887f4d18143578082c072eb7914018fa70c5247b8

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
Entorno
node 22.23.2
Creado
2026-09-05T07:37:10Z

Contrato

  1. parseSync is exported by @babel/core as a function and parses JavaScript code synchronously into an AST File root node with Program body
  2. parseSync parses ES module import and export declarations when sourceType is module
  3. parseSync parses script statements and directive prologues when sourceType is script
  4. parseSync parses modern ECMAScript features including optional chaining, nullish coalescing, and numeric separators
  5. parseSync parses JSX syntax elements when jsx plugin is enabled in parserOpts
  6. parseSync returns null when filename matches configured ignore pattern
  7. parseSync throws SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax

Archivos

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

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
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:sha256:852cc1dc6e8b881c11a497bb0090e76a3cc3d50218f947bb11b807a9273cebd8","constraints":{"executionContext":"node"},"contract":["parseSync is exported by @babel/core as a function and parses JavaScript code synchronously into an AST File root node with Program body","parseSync parses ES module import and export declarations when sourceType is module","parseSync parses script statements and directive prologues when sourceType is script","parseSync parses modern ECMAScript features including optional chaining, nullish coalescing, and numeric separators","parseSync parses JSX syntax elements when jsx plugin is enabled in parserOpts","parseSync returns null when filename matches configured ignore pattern","parseSync throws SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax"],"goal":"verify pkg:npm/%40babel/core@7.24.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.24.7"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"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","verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-core-parsesync",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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      "name": "sample-babel-core-parsesync",
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package.json
{
  "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"
}
spec.json
{
  "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"
  }
}
src/index.js
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
};
test/contract.mjs
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.');

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