CodeSampleX

Ejemplo

@babel/core 7.24.7: transformFromAstSync

Muestra verificada para npm @babel/core 7.24.7: transformFromAstSync. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:283e283ffd2cd3ddc140326755f87489c2bc24a3d91dc3edc5d6548057b03e92

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 @babel/core.transformFromAstSync in pkg:npm/%40babel/core@7.24.7
Paquetes
Símbolos
  • @babel/core.transformFromAstSync
Entorno
node 22.23.2
Creado
2026-09-05T08:02:13Z

Contrato

  1. transformFromAstSync synchronously transforms an AST into generated JavaScript code and returns code string
  2. transformFromAstSync applies custom Babel plugins to transform AST nodes during code generation
  3. transformFromAstSync returns null for ast property by default unless ast option is set to true
  4. transformFromAstSync preserves original AST without mutation when cloneInputAst defaults to true
  5. transformFromAstSync mutates the input AST in-place when cloneInputAst is false
  6. transformFromAstSync generates source maps when sourceMaps option is true
  7. transformFromAstSync throws an Error when invoked with an invalid AST

Archivos

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

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.transformFromAstSync in 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.transformFromAstSync
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:f80fb29a2b64443530b0fe9d4334512ba18d19aee2e8447f90e7596baa71d90b","constraints":{"executionContext":"node"},"contract":["transformFromAstSync synchronously transforms an AST into generated JavaScript code and returns code string","transformFromAstSync applies custom Babel plugins to transform AST nodes during code generation","transformFromAstSync returns null for ast property by default unless ast option is set to true","transformFromAstSync preserves original AST without mutation when cloneInputAst defaults to true","transformFromAstSync mutates the input AST in-place when cloneInputAst is false","transformFromAstSync generates source maps when sourceMaps option is true","transformFromAstSync throws an Error when invoked with an invalid AST"],"goal":"verify @babel/core.transformFromAstSync in pkg:npm/%40babel/core@7.24.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.24.7"],"schemaVersion":1,"symbols":["@babel/core.transformFromAstSync"]},"contractCommand":["node","test/contract.js"],"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","symbols":["@babel/core.transformFromAstSync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-transformfromastsync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformFromAstSync 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.transformFromAstSync in pkg:npm/%40babel/core@7.24.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.24.7"
  ],
  "symbols": [
    "@babel/core.transformFromAstSync"
  ],
  "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 an AST into JavaScript code synchronously using @babel/core.transformFromAstSync.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} [code=''] - The original source code string corresponding to the AST.
 * @param {object} [options={}] - Babel transformation options.
 * @returns {object|null} The transformation result containing code, map, ast, etc.
 */
function transformAst(ast, code = '', options = {}) {
  const mergedOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformFromAstSync(ast, code, mergedOptions);
}

/**
 * Transforms an AST using custom Babel plugins and returns the transformation result.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} code - The original source code.
 * @param {Array} plugins - List of Babel plugins/visitors to apply.
 * @param {object} [options={}] - Additional Babel options.
 * @returns {object|null} The transformation result.
 */
function transformAstWithPlugins(ast, code, plugins = [], options = {}) {
  return transformAst(ast, code, {
    plugins,
    ...options
  });
}

/**
 * Transforms an AST and includes the transformed AST in the result object.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} code - The original source code.
 * @param {object} [options={}] - Additional Babel options.
 * @returns {object|null} The transformation result with populated result.ast.
 */
function transformAstWithAstOutput(ast, code, options = {}) {
  return transformAst(ast, code, {
    ast: true,
    ...options
  });
}

/**
 * Generates source maps along with code transformation from an AST.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} code - The original source code.
 * @param {string} sourceFileName - Source file name for mapping.
 * @param {object} [options={}] - Additional Babel options.
 * @returns {object|null} The transformation result with source map.
 */
function transformAstWithSourceMap(ast, code, sourceFileName = 'source.js', options = {}) {
  return transformAst(ast, code, {
    sourceMaps: true,
    sourceFileName,
    ...options
  });
}

module.exports = {
  transformAst,
  transformAstWithPlugins,
  transformAstWithAstOutput,
  transformAstWithSourceMap
};
test/contract.js
const assert = require('assert');
const babel = require('@babel/core');
const {
  transformAst,
  transformAstWithPlugins,
  transformAstWithAstOutput,
  transformAstWithSourceMap
} = require('../src/index');

// 1. transformFromAstSync synchronously transforms an AST into generated JavaScript code and returns code string
{
  const sourceCode = 'const answer = 42;';
  const ast = babel.parseSync(sourceCode, { configFile: false, babelrc: false });
  const result = transformAst(ast, sourceCode);
  assert(result !== null, 'Result should not be null');
  assert.strictEqual(typeof result.code, 'string', 'result.code should be a string');
  assert(result.code.includes('const answer = 42;'), 'Generated code should match source code structure');
}

// 2. transformFromAstSync applies custom Babel plugins to transform AST nodes during code generation
{
  const sourceCode = 'const beforeName = 100;';
  const ast = babel.parseSync(sourceCode, { configFile: false, babelrc: false });
  const renamePlugin = {
    visitor: {
      Identifier(path) {
        if (path.node.name === 'beforeName') {
          path.node.name = 'afterName';
        }
      }
    }
  };
  const result = transformAstWithPlugins(ast, sourceCode, [renamePlugin]);
  assert(result !== null, 'Result should not be null');
  assert(result.code.includes('const afterName = 100;'), 'Identifier must be renamed by plugin');
  assert(!result.code.includes('beforeName'), 'Original identifier name must not appear in output');
}

// 3. transformFromAstSync returns null for ast property by default unless ast option is set to true
{
  const sourceCode = 'let message = "hello";';
  const ast = babel.parseSync(sourceCode, { configFile: false, babelrc: false });

  const defaultResult = transformAst(ast, sourceCode);
  assert.strictEqual(defaultResult.ast, null, 'ast property should be null by default');

  const astResult = transformAstWithAstOutput(ast, sourceCode);
  assert(astResult.ast !== null, 'ast property should be populated when ast: true');
  assert.strictEqual(astResult.ast.type, 'File', 'Returned ast must be a File node');
  assert.strictEqual(astResult.ast.program.type, 'Program', 'Returned ast must contain Program');
}

// 4. transformFromAstSync preserves original AST without mutation when cloneInputAst defaults to true
{
  const sourceCode = 'const unchanged = 1;';
  const ast = babel.parseSync(sourceCode, { configFile: false, babelrc: false });
  const mutatePlugin = {
    visitor: {
      Identifier(path) {
        if (path.node.name === 'unchanged') {
          path.node.name = 'modified';
        }
      }
    }
  };
  const result = babel.transformFromAstSync(ast, sourceCode, {
    configFile: false,
    babelrc: false,
    plugins: [mutatePlugin]
  });
  assert.strictEqual(ast.program.body[0].declarations[0].id.name, 'unchanged', 'Original AST must not be modified');
  assert(result.code.includes('const modified = 1;'), 'Output code should contain transformed identifier');
}

// 5. transformFromAstSync mutates the input AST in-place when cloneInputAst is false
{
  const sourceCode = 'const target = "value";';
  const ast = babel.parseSync(sourceCode, { configFile: false, babelrc: false });
  const mutatePlugin = {
    visitor: {
      Identifier(path) {
        if (path.node.name === 'target') {
          path.node.name = 'mutatedTarget';
        }
      }
    }
  };
  const result = babel.transformFromAstSync(ast, sourceCode, {
    configFile: false,
    babelrc: false,
    cloneInputAst: false,
    ast: true,
    plugins: [mutatePlugin]
  });
  assert.strictEqual(ast.program.body[0].declarations[0].id.name, 'mutatedTarget', 'Input AST must be mutated in place');
  assert.strictEqual(result.ast, ast, 'result.ast should reference the same input AST object');
}

// 6. transformFromAstSync generates source maps when sourceMaps option is true
{
  const sourceCode = 'const calc = 10 * 20;';
  const ast = babel.parseSync(sourceCode, { configFile: false, babelrc: false });
  const result = transformAstWithSourceMap(ast, sourceCode, 'calc.js');
  assert(result.map !== null, 'Source map should be generated');
  assert.strictEqual(result.map.version, 3, 'Source map version must be 3');
  assert(Array.isArray(result.map.sources), 'Source map sources must be an array');
  assert(result.map.sources.includes('calc.js'), 'Source map must reference source file');
}

// 7. transformFromAstSync throws an Error when invoked with an invalid AST
{
  assert.throws(
    () => {
      babel.transformFromAstSync(null, '', { configFile: false, babelrc: false });
    },
    (err) => {
      return err instanceof Error;
    },
    'Calling transformFromAstSync with null AST must throw an Error'
  );
}

console.log('All @babel/core.transformFromAstSync contract assertions passed successfully.');

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