CodeSampleX

Ejemplo

@babel/core 7.29.7: parseSync

Muestra verificada para npm @babel/core 7.29.7: parseSync. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:dfaeb4f8e2105131fa1f1d99c80499e1b4fb0ab089117f90760e61727b2d7a12

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 linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

Caso

HOW
Objetivo
verify @babel/core.parseSync in pkg:npm/%40babel/core@7.29.7
Paquetes
Símbolos
  • @babel/core.parseSync
Creado
2026-08-23T06:17:20Z

Contrato

  1. babel exports parseSync function
  2. parseSync parses JavaScript source code into a File AST node with Program body and default sourceType module
  3. parseSync accepts parserOpts plugins such as jsx to parse extended syntax without transformation plugins
  4. parseSync populates tokens array when parserOpts.tokens is true
  5. parseSync with sourceType unambiguous parses export statements as module and plain statements as script
  6. parseSync returns null when filename matches ignore pattern in options
  7. parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • 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 @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.
csx.json
{"case":{"caseId":"case:sha256:7bb63e80404aff344ba9a5b81d58c310ff3dcc0f0a9c929a71c628841636840d","contract":["babel exports parseSync function","parseSync parses JavaScript source code into a File AST node with Program body and default sourceType module","parseSync accepts parserOpts plugins such as jsx to parse extended syntax without transformation plugins","parseSync populates tokens array when parserOpts.tokens is true","parseSync with sourceType unambiguous parses export statements as module and plain statements as script","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@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"symbols":["@babel/core.parseSync"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.7","symbols":["@babel/core.parseSync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-parsesync",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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    "": {
      "name": "sample-babel-parsesync",
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      "dependencies": {
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        "picocolors": "^1.1.1"
      },
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package.json
{
  "name": "sample-babel-parsesync",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.29.7"
  }
}
spec.json
{
  "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"
  ]
}
test/contract.mjs
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.');

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