CodeSampleX

Ejemplo

@babel/core 7.29.6: buildExternalHelpers

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

sha256:375672659ed8567ff7a1ce254f0bf35538a0c94a7a1f5c56d28313d61be443e9

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
  • buildExternalHelpers
Creado
2026-09-03T10:09:38Z

Contrato

  1. babel.buildExternalHelpers is exported as a function by @babel/core and returns a string of helper definitions
  2. buildExternalHelpers defaults to global outputType wrapping helpers in an IIFE assigning to global.babelHelpers
  3. buildExternalHelpers produces UMD formatted wrapper when outputType is set to umd
  4. buildExternalHelpers produces standalone var declarations when outputType is set to var
  5. buildExternalHelpers restricts generated code to specified helpers when whitelist array is provided
  6. buildExternalHelpers outputs only the container wrapper without helper implementations when whitelist is empty array
  7. buildExternalHelpers throws an Error with Unsupported output type message when given an invalid outputType
  8. buildExternalHelpers requires explicit dependency inclusion in whitelist for composite helpers such as inherits requiring setPrototypeOf

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:
  - buildExternalHelpers

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:fcc78e3690054d8f790a1a10cf11ed9077c09120db8a4c3d23f6ed3b9491909a","contract":["babel.buildExternalHelpers is exported as a function by @babel/core and returns a string of helper definitions","buildExternalHelpers defaults to global outputType wrapping helpers in an IIFE assigning to global.babelHelpers","buildExternalHelpers produces UMD formatted wrapper when outputType is set to umd","buildExternalHelpers produces standalone var declarations when outputType is set to var","buildExternalHelpers restricts generated code to specified helpers when whitelist array is provided","buildExternalHelpers outputs only the container wrapper without helper implementations when whitelist is empty array","buildExternalHelpers throws an Error with Unsupported output type message when given an invalid outputType","buildExternalHelpers requires explicit dependency inclusion in whitelist for composite helpers such as inherits requiring setPrototypeOf"],"goal":"verify pkg:npm/%40babel/core@7.29.6","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"symbols":["buildExternalHelpers"]},"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":["buildExternalHelpers"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-core-build-external-helpers",
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package.json
{
  "name": "sample-babel-core-build-external-helpers",
  "version": "1.0.0",
  "description": "verify @babel/core.buildExternalHelpers 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": [
    "buildExternalHelpers"
  ]
}
src/index.mjs
import * as babel from "@babel/core";

/**
 * Builds external helper code from @babel/core.
 *
 * @param {string[]|null|undefined} [whitelist] - List of helper names to include.
 * @param {"global"|"umd"|"var"} [outputType="global"] - Output format type.
 * @returns {string} The generated helper code.
 */
export function buildHelpers(whitelist, outputType) {
  return babel.buildExternalHelpers(whitelist, outputType);
}

/**
 * Generates external helpers in var format for a given whitelist.
 *
 * @param {string[]} [whitelist] - List of helper names to include.
 * @returns {string} The generated var-format helper code.
 */
export function buildVarHelpers(whitelist) {
  return babel.buildExternalHelpers(whitelist, "var");
}

/**
 * Evaluates var-format helper code in an isolated scope and returns the babelHelpers object.
 *
 * @param {string[]} [whitelist] - List of helper names to include.
 * @returns {Record<string, Function>} The instantiated babelHelpers object.
 */
export function evaluateVarHelpers(whitelist) {
  const code = buildVarHelpers(whitelist);
  const factory = new Function(code + "; return babelHelpers;");
  return factory();
}

export { babel };
test/contract.mjs
import assert from "node:assert/strict";
import * as babel from "@babel/core";
import {
  buildHelpers,
  buildVarHelpers,
  evaluateVarHelpers,
} from "../src/index.mjs";

function runContracts() {
  // Contract 1: babel.buildExternalHelpers is exported as a function by @babel/core and returns a string of helper definitions
  {
    assert.strictEqual(
      typeof babel.buildExternalHelpers,
      "function",
      "babel.buildExternalHelpers must be exported as a function"
    );

    const result = buildHelpers();
    assert.strictEqual(
      typeof result,
      "string",
      "buildExternalHelpers must return a string"
    );
    assert.ok(
      result.length > 0,
      "generated helpers string must not be empty"
    );
  }

  // Contract 2: buildExternalHelpers defaults to global outputType wrapping helpers in an IIFE assigning to global.babelHelpers
  {
    const result = buildHelpers();
    assert.ok(
      result.includes("global.babelHelpers = {}"),
      "default output must assign to global.babelHelpers"
    );
    assert.ok(
      result.includes('typeof global === "undefined" ? self : global'),
      "default output must detect global or self in IIFE invocation"
    );
  }

  // Contract 3: buildExternalHelpers produces UMD formatted wrapper when outputType is set to umd
  {
    const result = buildHelpers(undefined, "umd");
    assert.strictEqual(
      typeof result,
      "string",
      "umd output must be a string"
    );
    assert.ok(
      result.includes('typeof define === "function" && define.amd'),
      "umd output must check for define.amd"
    );
    assert.ok(
      result.includes("factory(root.babelHelpers = {})"),
      "umd output must invoke factory with root.babelHelpers"
    );
  }

  // Contract 4: buildExternalHelpers produces standalone var declarations when outputType is set to var
  {
    const result = buildHelpers(undefined, "var");
    assert.strictEqual(
      typeof result,
      "string",
      "var output must be a string"
    );
    assert.ok(
      result.startsWith("var babelHelpers = {};"),
      "var output must declare babelHelpers variable at top"
    );
    assert.ok(
      result.trimEnd().endsWith("babelHelpers;"),
      "var output must end with babelHelpers reference expression"
    );
  }

  // Contract 5: buildExternalHelpers restricts generated code to specified helpers when whitelist array is provided
  {
    const result = buildHelpers(["classCallCheck"], "var");
    assert.ok(
      result.includes("classCallCheck"),
      "whitelisted helper classCallCheck must be present"
    );
    assert.ok(
      !result.includes("_inherits"),
      "unselected helper inherits must not be included"
    );
  }

  // Contract 6: buildExternalHelpers outputs only the container wrapper without helper implementations when whitelist is empty array
  {
    const result = buildHelpers([], "var");
    assert.strictEqual(
      result.trim(),
      "var babelHelpers = {};\nbabelHelpers;",
      "empty whitelist must produce only empty container shell"
    );
  }

  // Contract 7: buildExternalHelpers throws an Error with Unsupported output type message when given an invalid outputType
  {
    assert.throws(
      () => {
        buildHelpers(undefined, "unsupported_format");
      },
      (err) => {
        return err instanceof Error && /Unsupported output type/i.test(err.message);
      },
      "must throw error matching Unsupported output type for invalid outputType"
    );
  }

  // Contract 8: buildExternalHelpers requires explicit dependency inclusion in whitelist for composite helpers such as inherits requiring setPrototypeOf
  {
    const helpersOnlyInherits = evaluateVarHelpers(["inherits"]);
    assert.strictEqual(
      typeof helpersOnlyInherits.inherits,
      "function",
      "inherits must be defined when requested"
    );
    assert.strictEqual(
      typeof helpersOnlyInherits.setPrototypeOf,
      "undefined",
      "setPrototypeOf must not be included automatically when not in whitelist"
    );

    const fullHelpers = evaluateVarHelpers(["inherits", "setPrototypeOf"]);
    assert.strictEqual(
      typeof fullHelpers.inherits,
      "function",
      "inherits must be defined"
    );
    assert.strictEqual(
      typeof fullHelpers.setPrototypeOf,
      "function",
      "setPrototypeOf must be defined"
    );

    function SuperType() {}
    SuperType.prototype.identify = function () {
      return "base";
    };

    function SubType() {}
    fullHelpers.inherits(SubType, SuperType);

    const instance = new SubType();
    assert.ok(
      instance instanceof SuperType,
      "instance of SubType must be an instance of SuperType via inherits"
    );
    assert.strictEqual(
      instance.identify(),
      "base",
      "inherited prototype method must return expected value"
    );
  }

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

runContracts();

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