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:e80fc029295ce3a4fd5ec262479562f501f234335c3f14b5307900663ce550a7

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 transformFromAstSync in pkg:npm/%40babel/core@7.24.7
Paquetes
Símbolos
  • transformFromAstSync
Entorno
node 22.23.2
Creado
2026-09-05T08:18:12Z

Contrato

  1. transformFromAstSync synchronously transforms an AST into generated JavaScript code string
  2. transformFromAstSync applies custom plugin visitors synchronously to modify AST identifiers
  3. transformFromAstSync generates source maps when sourceMaps option is enabled
  4. transformFromAstSync returns transformed AST when ast option is set to true and skips code when code option is false
  5. transformFromAstSync returns null when filename matches ignore pattern
  6. transformFromAstSync throws an Error when ast argument is null or invalid

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 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:
  - 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:e1f62e29c83dcb8b404037d55bace8b71e158a59b83dbd4d10fabf30430289da","constraints":{"executionContext":"node"},"contract":["transformFromAstSync synchronously transforms an AST into generated JavaScript code string","transformFromAstSync applies custom plugin visitors synchronously to modify AST identifiers","transformFromAstSync generates source maps when sourceMaps option is enabled","transformFromAstSync returns transformed AST when ast option is set to true and skips code when code option is false","transformFromAstSync returns null when filename matches ignore pattern","transformFromAstSync throws an Error when ast argument is null or invalid"],"goal":"verify transformFromAstSync in pkg:npm/%40babel/core@7.24.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.24.7"],"schemaVersion":1,"symbols":["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":["transformFromAstSync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-transformfromastsync",
  "version": "1.0.0",
  "description": "verify 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 transformFromAstSync in pkg:npm/%40babel/core@7.24.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.24.7"
  ],
  "symbols": [
    "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 synchronously using @babel/core.transformFromAstSync.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} [code] - The optional source code corresponding to the AST.
 * @param {object} [options={}] - Optional Babel transform options.
 * @returns {object|null} The transformation result with code, map, and ast.
 */
function transformFromAst(ast, code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return babel.transformFromAstSync(ast, code, defaultOptions);
}

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

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

/**
 * Transforms an AST synchronously returning only the AST without code generation.
 *
 * @param {object} ast - The AST to transform.
 * @param {string} [code] - The optional source code.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformation result with ast and null code.
 */
function transformFromAstOnly(ast, code, options = {}) {
  return transformFromAst(ast, code, {
    ...options,
    ast: true,
    code: false
  });
}

module.exports = {
  transformFromAst,
  transformFromAstWithVisitor,
  transformFromAstWithSourceMap,
  transformFromAstOnly
};
test/contract.js
const assert = require('assert');
const babel = require('@babel/core');
const {
  transformFromAst,
  transformFromAstWithVisitor,
  transformFromAstWithSourceMap,
  transformFromAstOnly
} = require('../src/index');

// 1. transformFromAstSync synchronously transforms an AST into generated JavaScript code string
{
  const input = 'const x = 1 + 2;';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAst(ast, 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. transformFromAstSync applies custom plugin visitors synchronously to modify AST identifiers
{
  const input = 'const oldName = 42;';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAstWithVisitor(ast, 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. transformFromAstSync generates source maps when sourceMaps option is enabled
{
  const input = 'function add(a, b) { return a + b; }';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAstWithSourceMap(ast, 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. transformFromAstSync returns transformed AST when ast option is set to true and skips code when code option is false
{
  const input = 'const message = "hello";';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAstOnly(ast, input);
  assert(result !== null, 'Result should not be null');
  assert.strictEqual(result.code, null, 'Code should be null when code: false');
  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. transformFromAstSync returns null when filename matches ignore pattern
{
  const input = 'const ignored = true;';
  const ast = babel.parseSync(input, { configFile: false, babelrc: false });
  const result = transformFromAst(ast, input, {
    filename: 'ignored-file.js',
    ignore: [/ignored-file/]
  });
  assert.strictEqual(result, null, 'Ignored file transformation must return null');
}

// 6. transformFromAstSync throws an Error when ast argument is null or invalid
{
  assert.throws(
    () => {
      babel.transformFromAstSync(null);
    },
    (err) => {
      return err instanceof Error && err.message.includes('No AST given');
    },
    'Passing null AST must throw an Error with "No AST given"'
  );
  assert.throws(
    () => {
      babel.transformFromAstSync({ type: 'InvalidNodeType' });
    },
    (err) => {
      return err instanceof Error && err.message.includes('AST root must be a Program or File node');
    },
    'Passing invalid AST node type must throw an Error'
  );
}

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

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