Exemplo

@babel/core 7.26.10: transformAsync

Amostra verificada para npm @babel/core 7.26.10: transformAsync. O contrato rodou em node 22 · linux debian/x64 · docker e passou.

sha256:d2defa8b62c738f4310e50b0bba0be0c098265ed0cca566bd71d5c5e0c9f9905

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…	2026-09-14

Caso

HOW

Objetivo: verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.26.10
Pacotes: @babel/core 7.26.10
Símbolos: @babel/core.transformAsync
Ambiente: node 22.23.2
Criado: 2026-09-14T22:37:14Z

Contrato

transformAsync asynchronously transforms JavaScript code and returns a Promise resolving to an object with generated code string
transformAsync applies custom plugin visitors asynchronously to modify AST identifiers
transformAsync generates source maps when sourceMaps option is enabled
transformAsync returns AST node when ast option is set to true and null when false
transformAsync returns null when filename matches ignore pattern
transformAsync rejects with a SyntaxError having BABEL_PARSE_ERROR code when given invalid JavaScript syntax
transformAsync handles concurrent transformations 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 @babel/core.transformAsync 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.transformAsync

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-transformasync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformAsync 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.transformAsync in pkg:npm/%40babel/core@7.26.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.10"
  ],
  "symbols": [
    "@babel/core.transformAsync"
  ]
}

src/index.js

const babel = require('@babel/core');

/**
 * Transforms JavaScript code asynchronously using @babel/core.transformAsync.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Optional Babel transform options.
 * @returns {Promise<object|null>} A promise resolving to the transformation result.
 */
async function transformCodeAsync(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformAsync(code, defaultOptions);
}

/**
 * Transforms code asynchronously with a custom AST visitor plugin.
 *
 * @param {string} code - The source code to transform.
 * @param {object} visitor - AST visitor map.
 * @returns {Promise<object|null>} A promise resolving to the transformation result.
 */
async function transformWithVisitorAsync(code, visitor) {
  const customPlugin = () => ({
    visitor
  });
  return transformCodeAsync(code, {
    plugins: [customPlugin]
  });
}

/**
 * Transforms code asynchronously and produces a source map.
 *
 * @param {string} code - The source code to transform.
 * @param {string} [filename='source.js'] - Virtual filename for source mapping.
 * @returns {Promise<object|null>} A promise resolving to the transformation result with source map.
 */
async function transformWithSourceMapAsync(code, filename = 'source.js') {
  return transformCodeAsync(code, {
    filename,
    sourceMaps: true
  });
}

module.exports = {
  transformCodeAsync,
  transformWithVisitorAsync,
  transformWithSourceMapAsync
};

test/contract.js

const assert = require('assert');
const babel = require('@babel/core');
const {
  transformCodeAsync,
  transformWithVisitorAsync,
  transformWithSourceMapAsync
} = require('../src/index');

(async () => {
  // 1. transformAsync asynchronously transforms JavaScript code and returns a Promise resolving to an object with generated code string
  {
    const input = 'const x = 1 + 2;';
    const result = await transformCodeAsync(input);
    assert(result !== null, 'Result should not be null');
    assert.strictEqual(typeof result.code, 'string', 'Result must contain code string');
    assert(result.code.includes('const x = 1 + 2;'), 'Transformed code should contain statement');
  }

  // 2. transformAsync applies custom plugin visitors asynchronously to modify AST identifiers
  {
    const input = 'const oldName = 42;';
    const result = await transformWithVisitorAsync(input, {
      Identifier(path) {
        if (path.node.name === 'oldName') {
          path.node.name = 'newName';
        }
      }
    });
    assert(result !== null, 'Result should not be null');
    assert(result.code.includes('const newName = 42;'), 'Identifier must be renamed');
    assert(!result.code.includes('oldName'), 'Old identifier should not be present');
  }

  // 3. transformAsync generates source maps when sourceMaps option is enabled
  {
    const input = 'function add(a, b) { return a + b; }';
    const result = await transformWithSourceMapAsync(input, 'calc.js');
    assert(result !== null, 'Result should not be null');
    assert(result.map !== null && typeof result.map === 'object', 'Source map should be generated');
    assert.strictEqual(result.map.version, 3, 'Source map version should be 3');
    assert(Array.isArray(result.map.sources), 'Source map sources should be an array');
    assert(result.map.sources.includes('calc.js'), 'Sources should include calc.js');
    assert.strictEqual(typeof result.map.mappings, 'string', 'Mappings should be a string');
  }

  // 4. transformAsync returns AST node when ast option is set to true and null when false
  {
    const input = 'const value = "hello";';
    const resultWithAst = await transformCodeAsync(input, { ast: true });
    assert(resultWithAst !== null, 'Result should not be null');
    assert(resultWithAst.ast !== null && typeof resultWithAst.ast === 'object', 'AST must be returned when ast: true');
    assert.strictEqual(resultWithAst.ast.type, 'File', 'AST root node must be File');
    assert.strictEqual(resultWithAst.ast.program.type, 'Program', 'AST must contain Program node');

    const resultWithoutAst = await transformCodeAsync(input, { ast: false });
    assert(resultWithoutAst !== null, 'Result should not be null');
    assert.strictEqual(resultWithoutAst.ast, null, 'AST must be null when ast: false');
  }

  // 5. transformAsync returns null when filename matches ignore pattern
  {
    const input = 'const skipped = true;';
    const result = await transformCodeAsync(input, {
      filename: 'ignored-file.js',
      ignore: [/ignored-file/]
    });
    assert.strictEqual(result, null, 'Ignored file transformation must return null');
  }

  // 6. transformAsync rejects with a SyntaxError having BABEL_PARSE_ERROR code when given invalid JavaScript syntax
  {
    let rejected = false;
    try {
      await transformCodeAsync('const broken = ;');
    } 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. transformAsync handles concurrent transformations independently via Promise.all
  {
    const inputs = [
      'const first = 10;',
      'const second = 20;',
      'const third = 30;'
    ];
    const results = await Promise.all(inputs.map((code) => transformCodeAsync(code)));
    assert.strictEqual(results.length, 3, 'Must return results for all inputs');
    results.forEach((res, idx) => {
      assert(res !== null, `Result ${idx} must not be null`);
      assert(res.code.includes(inputs[idx]), `Result ${idx} must contain input code`);
    });
  }

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

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