CodeSampleX

Ejemplo

@babel/core 7.29.6: transformSync

Muestra verificada para npm @babel/core 7.29.6: transformSync. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:600b2ed5c17b30fc1241e8fcaf794bb0e586953e9ee6fdb1b208891c1fc59a2d

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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 pkg:npm/%40babel/core@7.29.6
Paquetes
Símbolos
  • transformSync
Creado
2026-09-03T10:03:38Z

Contrato

  1. babel.transformSync is exported as a function by @babel/core and transforms JavaScript source code into generated code string
  2. transformSync returns null for result.ast by default when options.ast is omitted or false
  3. transformSync returns the transformed File AST node on result.ast when options.ast is set to true
  4. transformSync applies custom plugin visitors synchronously to modify AST nodes and generates modified output code
  5. transformSync produces source map mappings when options.sourceMaps is enabled
  6. transformSync returns minified output code without comments when minified option is true
  7. transformSync returns null when filename matches configured ignore pattern
  8. transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • 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 pkg:npm/%40babel/core@7.29.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.6
Demonstrate these symbols/APIs:
  - transformSync

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:sha256:667c50c563df1dbd8a76693eeff67f0bbdc376320fab6c9cd4876349491556cb","contract":["babel.transformSync is exported as a function by @babel/core and transforms JavaScript source code into generated code string","transformSync returns null for result.ast by default when options.ast is omitted or false","transformSync returns the transformed File AST node on result.ast when options.ast is set to true","transformSync applies custom plugin visitors synchronously to modify AST nodes and generates modified output code","transformSync produces source map mappings when options.sourceMaps is enabled","transformSync returns minified output code without comments when minified option is true","transformSync returns null when filename matches configured ignore pattern","transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax"],"goal":"verify pkg:npm/%40babel/core@7.29.6","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"symbols":["transformSync"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.6","symbols":["transformSync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-core-transformsync",
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  "lockfileVersion": 3,
  "requires": true,
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package.json
{
  "name": "sample-babel-core-transformsync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformSync in pkg:npm/%40babel/core@7.29.6",
  "type": "module",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.29.6"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/core@7.29.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.6"
  ],
  "symbols": [
    "transformSync"
  ]
}
src/index.mjs
import * as babel from "@babel/core";

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

/**
 * Transforms code synchronously applying a custom visitor plugin.
 *
 * @param {string} code - The source code to transform.
 * @param {object|Function} plugin - Babel plugin function or object.
 * @param {object} [options={}] - Additional options.
 * @returns {string} The transformed code string.
 */
export function transformWithPlugin(code, plugin, options = {}) {
  const result = transformCode(code, {
    plugins: [plugin],
    ...options,
  });
  return result ? result.code : "";
}

/**
 * Transforms code and requests the AST in the result.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformed AST node from result.ast.
 */
export function transformToAst(code, options = {}) {
  const result = transformCode(code, {
    ast: true,
    code: false,
    ...options,
  });
  return result ? result.ast : null;
}

/**
 * Transforms code and generates a v3 source map.
 *
 * @param {string} code - The source code to transform.
 * @param {string} [filename="source.js"] - Virtual filename for source mapping.
 * @param {object} [options={}] - Additional options.
 * @returns {{code: string, map: object|null}} Generated code and source map object.
 */
export function transformWithSourceMap(code, filename = "source.js", options = {}) {
  const result = transformCode(code, {
    filename,
    sourceMaps: true,
    ...options,
  });
  return {
    code: result ? result.code : "",
    map: result ? result.map : null,
  };
}

/**
 * Transforms code with minified output.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Additional options.
 * @returns {string} The minified code string.
 */
export function transformMinified(code, options = {}) {
  const result = transformCode(code, {
    minified: true,
    comments: false,
    ...options,
  });
  return result ? result.code : "";
}

export { babel };
test/contract.mjs
import assert from "node:assert/strict";
import * as babel from "@babel/core";
import {
  transformCode,
  transformWithPlugin,
  transformToAst,
  transformWithSourceMap,
  transformMinified,
} from "../src/index.mjs";

function runContracts() {
  // Contract 1: babel.transformSync is exported as a function by @babel/core and transforms JavaScript source code into generated code string
  {
    assert.strictEqual(
      typeof babel.transformSync,
      "function",
      "babel.transformSync must be a function"
    );

    const input = 'const x = 1 + 2;';
    const result = transformCode(input);
    assert.ok(result !== null, "transformSync must return a result object");
    assert.strictEqual(typeof result.code, "string", "result.code must be a string");
    assert.ok(result.code.includes("const x = 1 + 2;"), "result.code must contain code");
  }

  // Contract 2: transformSync returns null for result.ast by default when options.ast is omitted or false
  {
    const input = 'const value = 42;';
    const result = transformCode(input);
    assert.ok(result !== null, "result must not be null");
    assert.strictEqual(result.ast, null, "result.ast must be strictly null by default");
    assert.strictEqual(typeof result.code, "string", "result.code must be present");
  }

  // Contract 3: transformSync returns the transformed File AST node on result.ast when options.ast is set to true
  {
    const input = 'const greeting = "hello";';
    const ast = transformToAst(input);
    assert.ok(ast !== null, "ast must not be null");
    assert.strictEqual(ast.type, "File", "returned AST must have type 'File'");
    assert.ok(ast.program, "returned AST must have a program node");
    assert.strictEqual(ast.program.type, "Program");
    assert.strictEqual(ast.program.body[0].type, "VariableDeclaration");
  }

  // Contract 4: transformSync applies custom plugin visitors synchronously to modify AST nodes and generates modified output code
  {
    const input = 'const oldName = 100;';
    const renamePlugin = () => ({
      visitor: {
        Identifier(path) {
          if (path.node.name === "oldName") {
            path.node.name = "newName";
          }
        },
      },
    });

    const output = transformWithPlugin(input, renamePlugin);
    assert.ok(output.includes("const newName = 100;"), "output must reflect plugin transformation");
    assert.ok(!output.includes("oldName"), "original identifier must not be present");
  }

  // Contract 5: transformSync produces source map mappings when options.sourceMaps is enabled
  {
    const input = 'function multiply(a, b) { return a * b; }';
    const { code, map } = transformWithSourceMap(input, "calc.js");
    assert.ok(typeof code === "string" && code.length > 0, "code must be generated");
    assert.ok(map !== null && typeof map === "object", "map must be generated");
    assert.strictEqual(map.version, 3, "source map version must be 3");
    assert.ok(Array.isArray(map.sources), "map sources must be an array");
    assert.ok(map.sources.includes("calc.js"), "sources must include calc.js");
    assert.strictEqual(typeof map.mappings, "string", "mappings must be a string");
  }

  // Contract 6: transformSync returns minified output code without comments when minified option is true
  {
    const input = '// this is a comment\nfunction test(x) {\n  return x * 2;\n}';
    const output = transformMinified(input);
    assert.ok(typeof output === "string", "minified output must be string");
    assert.ok(!output.includes("// this is a comment"), "comments must be removed");
    assert.ok(!output.includes("\n"), "output must not contain newlines");
    assert.ok(output.includes("function test(x){return x*2}"), "code must be minified");
  }

  // Contract 7: transformSync returns null when filename matches configured ignore pattern
  {
    const result = transformCode("const ignored = true;", {
      filename: "ignored.js",
      ignore: ["ignored.js"],
    });
    assert.strictEqual(result, null, "transformSync must return null for ignored files");
  }

  // Contract 8: transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax
  {
    assert.throws(
      () => {
        transformCode("const = 123;");
      },
      (err) => {
        return err.name === "SyntaxError" && err.code === "BABEL_PARSE_ERROR";
      },
      "transformSync must throw a SyntaxError with code BABEL_PARSE_ERROR on parse error"
    );
  }

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

runContracts();

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