Exemplo

@babel/core 7.24.7: transformSync

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

sha256:bbbe1bc0a2d44cd0940b4de378e1089503b7643e10fd93680e87adebd6fe4148

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 @babel/core.transformSync in pkg:npm/%40babel/core@7.24.7
Pacotes: @babel/core 7.24.7
Símbolos: @babel/core.transformSync
Ambiente: node 22.23.2
Criado: 2026-09-05T07:45:50Z

Contrato

transformSync synchronously transforms JavaScript code and returns an object with generated code string
transformSync applies custom plugin visitors synchronously to modify AST identifiers
transformSync generates source maps when sourceMaps option is enabled
transformSync returns AST node when ast option is set to true
transformSync returns null when filename matches ignore pattern
transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax

Arquivos

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

csx.json

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package-lock.json

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package.json

{
  "name": "sample-babel-transformsync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformSync 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 @babel/core.transformSync in pkg:npm/%40babel/core@7.24.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.24.7"
  ],
  "symbols": [
    "@babel/core.transformSync"
  ],
  "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');

/**
 * Transforms JavaScript code synchronously using @babel/core.transformSync.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Optional Babel transform options.
 * @returns {object|null} The transformation result with code, map, and ast.
 */
function transformCode(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformSync(code, defaultOptions);
}

/**
 * Transforms code synchronously with a custom AST visitor plugin.
 *
 * @param {string} code - The source code to transform.
 * @param {object} visitor - AST visitor map.
 * @returns {object|null} The transformation result.
 */
function transformWithVisitor(code, visitor) {
  const customPlugin = () => ({
    visitor
  });
  return transformCode(code, {
    plugins: [customPlugin]
  });
}

/**
 * Transforms code synchronously and produces a source map.
 *
 * @param {string} code - The source code to transform.
 * @param {string} [filename='source.js'] - Virtual filename for source mapping.
 * @returns {object|null} The transformation result with source map.
 */
function transformWithSourceMap(code, filename = 'source.js') {
  return transformCode(code, {
    filename,
    sourceMaps: true
  });
}

module.exports = {
  transformCode,
  transformWithVisitor,
  transformWithSourceMap
};

test/contract.js

const assert = require('assert');
const babel = require('@babel/core');
const { transformCode, transformWithVisitor, transformWithSourceMap } = require('../src/index');

// 1. transformSync synchronously transforms JavaScript code and returns an object with generated code string
{
  const input = 'const x = 1 + 2;';
  const result = transformCode(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. transformSync applies custom plugin visitors synchronously to modify AST identifiers
{
  const input = 'const oldName = 42;';
  const result = transformWithVisitor(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. transformSync generates source maps when sourceMaps option is enabled
{
  const input = 'function add(a, b) { return a + b; }';
  const result = transformWithSourceMap(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. transformSync returns AST node when ast option is set to true
{
  const input = 'const value = "hello";';
  const result = transformCode(input, { ast: true });
  assert(result !== null, 'Result should not be null');
  assert(result.ast !== null && typeof result.ast === 'object', 'AST must be returned when ast: true');
  assert.strictEqual(result.ast.type, 'File', 'AST root node must be File');
  assert.strictEqual(result.ast.program.type, 'Program', 'AST must contain Program node');
}

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

// 6. transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax
{
  assert.throws(
    () => {
      transformCode('const broken = ;');
    },
    (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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