Exemplo

@babel/core 7.24.7: parseAsync

Amostra verificada para npm @babel/core 7.24.7: parseAsync. O contrato rodou em node 22 · linux debian/x64 · docker e passou: parseAsync parses JavaScript…

sha256:a35da823a1c13984e9a3c8840481dc601234035ac43cc6ea4573f9a6f91a8a5b

MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência: Contrato assinado aprovado
Recibos de verificação: 1
Chaves de assinatura que o compilaram: 1

Ambiente declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Ambientes das execuções de verificação

Ambiente	Contrato	Etapas	Execução
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
Pacotes: @babel/core 7.24.7
Símbolos: @babel/core.parseAsync
Ambiente: node 22.23.2
Criado: 2026-09-05T08:11:22Z

Contrato

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

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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

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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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