CodeSampleX

Ejemplo

@babel/core 7.26.9: transformFileSync

Muestra verificada para npm @babel/core 7.26.9: transformFileSync. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:88c364d2038b6dacd57c810f19f9feb4056c59737d2ae106e5ffd53c463dd25e

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…		 2026-09-03

Caso

HOW
Objetivo
verify transformFileSync in pkg:npm/%40babel/core@7.26.9
Paquetes
Símbolos
  • transformFileSync
Entorno
node 22.23.2
Creado
2026-09-03T10:57:27Z

Contrato

  1. babel exports transformFileSync as a callable function
  2. transformFileSync synchronously transforms JavaScript source file and returns code string
  3. transformFileSync applies custom AST visitor plugins synchronously to modify AST identifiers in target file
  4. transformFileSync generates source maps referencing input file when sourceMaps option is enabled
  5. transformFileSync returns AST file node when ast option is set to true
  6. transformFileSync minifies code when minified option is set to true
  7. transformFileSync throws an error with ENOENT code when target file does not exist
  8. transformFileSync throws a SyntaxError with BABEL_PARSE_ERROR code when reading a file with invalid JavaScript syntax

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

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 transformFileSync in pkg:npm/%40babel/core@7.26.9
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.9
Demonstrate these symbols/APIs:
  - transformFileSync
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:a75a7b5ca85620c00cd80d9d0dd6648887d671299613d2d28afb352d223b97de","constraints":{"executionContext":"node"},"contract":["babel exports transformFileSync as a callable function","transformFileSync synchronously transforms JavaScript source file and returns code string","transformFileSync applies custom AST visitor plugins synchronously to modify AST identifiers in target file","transformFileSync generates source maps referencing input file when sourceMaps option is enabled","transformFileSync returns AST file node when ast option is set to true","transformFileSync minifies code when minified option is set to true","transformFileSync throws an error with ENOENT code when target file does not exist","transformFileSync throws a SyntaxError with BABEL_PARSE_ERROR code when reading a file with invalid JavaScript syntax"],"goal":"verify transformFileSync in pkg:npm/%40babel/core@7.26.9","kind":"HOW","packages":["pkg:npm/%40babel/core@7.26.9"],"schemaVersion":1,"symbols":["transformFileSync"]},"contractCommand":["node","test/contract.mjs"],"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@7.26.9"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.26.9","symbols":["transformFileSync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-core",
  "version": "1.0.0",
  "lockfileVersion": 3,
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      "name": "sample-babel-core",
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      "license": "Apache-2.0",
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}
package.json
{
  "name": "sample-babel-core",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.26.9"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify transformFileSync in pkg:npm/%40babel/core@7.26.9",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.9"
  ],
  "symbols": [
    "transformFileSync"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import os from 'node:os';
import * as babel from '@babel/core';

// 1. Export verification
assert.equal(typeof babel.transformFileSync, 'function', 'babel.transformFileSync must be a function');

const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'babel-test-'));
const validFile = path.join(tempDir, 'fixture.js');
const invalidFile = path.join(tempDir, 'invalid.js');

try {
  fs.writeFileSync(validFile, 'const OLD_NAME = 42;\nexport default OLD_NAME;\n');
  fs.writeFileSync(invalidFile, 'const 123broken = ;\n');

  // 2. Synchronous file transformation returning code
  const syncResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false
  });
  assert.ok(syncResult, 'transformFileSync must return result object');
  assert.equal(typeof syncResult.code, 'string', 'transformFileSync result must contain code string');
  assert.ok(syncResult.code.includes('const OLD_NAME = 42;'), 'transformFileSync should contain source code semantics');

  // 3. Custom AST visitor plugins
  const customPlugin = {
    visitor: {
      Identifier(path) {
        if (path.node.name === 'OLD_NAME') {
          path.node.name = 'NEW_NAME';
        }
      }
    }
  };
  const pluginResult = babel.transformFileSync(validFile, {
    plugins: [() => customPlugin],
    configFile: false,
    babelrc: false
  });
  assert.ok(pluginResult, 'plugin transformation must return result');
  assert.ok(pluginResult.code.includes('NEW_NAME'), 'transformed code should contain renamed identifier');
  assert.ok(!pluginResult.code.includes('OLD_NAME'), 'transformed code should not contain old identifier');

  // 4. Source map generation
  const mapResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false,
    sourceMaps: true
  });
  assert.ok(mapResult.map, 'transformFileSync should generate sourcemap when sourceMaps: true');
  assert.ok(mapResult.map.sources.length > 0, 'sourcemap sources should not be empty');
  assert.ok(mapResult.map.sources.some(s => s.includes('fixture.js')), 'sourcemap sources should reference input file');

  // 5. AST generation
  const astResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false,
    ast: true
  });
  assert.ok(astResult.ast, 'transformFileSync should return AST when ast: true');
  assert.equal(astResult.ast.type, 'File', 'root node of returned AST must be File');
  assert.equal(astResult.ast.program.type, 'Program', 'AST must have a Program node');

  // 6. Minification
  const minResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false,
    minified: true
  });
  assert.ok(minResult.code.length < syncResult.code.length, 'minified code should be shorter than unminified code');

  // 7. ENOENT on missing file
  let enoentErr = null;
  try {
    babel.transformFileSync(path.join(tempDir, 'nonexistent.js'), {
      configFile: false,
      babelrc: false
    });
  } catch (err) {
    enoentErr = err;
  }
  assert.ok(enoentErr, 'transformFileSync must throw when target file does not exist');
  assert.equal(enoentErr.code, 'ENOENT', 'error code must be ENOENT');

  // 8. BABEL_PARSE_ERROR on syntax error
  let parseErr = null;
  try {
    babel.transformFileSync(invalidFile, {
      configFile: false,
      babelrc: false
    });
  } catch (err) {
    parseErr = err;
  }
  assert.ok(parseErr, 'transformFileSync must throw when file has invalid syntax');
  assert.equal(parseErr.code, 'BABEL_PARSE_ERROR', 'error code must be BABEL_PARSE_ERROR');

  console.log('Contract tests passed successfully.');
} finally {
  fs.rmSync(tempDir, { recursive: true, force: true });
}

Seeder de origen

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