Ejemplo

@babel/plugin-syntax-optional-catch-binding 7.8.3

Muestra verificada para npm @babel/plugin-syntax-optional-catch-binding 7.8.3. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:07e52bfd63c0e75c56b0d358ab15e30536ebda760e63ae347487eb3e05c53caf

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 alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…	2026-08-27

Caso

HOW

Objetivo: verify pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3
Paquetes: @babel/plugin-syntax-optional-catch-binding 7.8.3
Entorno: node 22.23.2
Creado: 2026-08-27T21:35:05Z

Contrato

Plugin default export is a function factory asserting Babel 7 compatibility
Plugin factory returns an object named syntax-optional-catch-binding with a manipulateOptions method
manipulateOptions appends optionalCatchBinding to parserOpts.plugins array
manipulateOptions preserves existing parser plugins while appending optionalCatchBinding
configureParserOptions helper instantiates plugin and configures parser plugins list
Plugin instantiation throws error when incompatible Babel version is asserted

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/plugin-syntax-optional-catch-binding@7.8.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3
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:sha256:1fce5972329b4b313d057de204371cb2a757673d4c541e329b8b4864ef14eb08","constraints":{"executionContext":"node"},"contract":["Plugin default export is a function factory asserting Babel 7 compatibility","Plugin factory returns an object named syntax-optional-catch-binding with a manipulateOptions method","manipulateOptions appends optionalCatchBinding to parserOpts.plugins array","manipulateOptions preserves existing parser plugins while appending optionalCatchBinding","configureParserOptions helper instantiates plugin and configures parser plugins list","Plugin instantiation throws error when incompatible Babel version is asserted"],"goal":"verify pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3","kind":"HOW","packages":["pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3"],"schemaVersion":1},"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/plugin-syntax-optional-catch-binding@7.8.3"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3","verifierAdapter":"node-typescript@1"}

package-lock.json

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package.json

{
  "name": "sample-babel-plugin-syntax-optional-catch-binding",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-syntax-optional-catch-binding": "7.8.3"
  }
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-optional-catch-binding@7.8.3"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

src/index.mjs

import syntaxOptionalCatchBindingModule from "@babel/plugin-syntax-optional-catch-binding";

export const syntaxOptionalCatchBinding =
  typeof syntaxOptionalCatchBindingModule === "function"
    ? syntaxOptionalCatchBindingModule
    : syntaxOptionalCatchBindingModule.default || syntaxOptionalCatchBindingModule;

export function instantiatePlugin(api = {}, options = {}) {
  const normalizedApi = {
    assertVersion: (range) => {
      if (typeof api.assertVersion === "function") {
        api.assertVersion(range);
      }
    },
    ...api
  };
  return syntaxOptionalCatchBinding(normalizedApi, options);
}

export function applyManipulateOptions(pluginInstance, opts = {}, parserOpts = { plugins: [] }) {
  if (typeof pluginInstance?.manipulateOptions !== "function") {
    throw new Error("Invalid plugin instance: missing manipulateOptions function");
  }
  pluginInstance.manipulateOptions(opts, parserOpts);
  return parserOpts;
}

export function configureParserOptions(initialPlugins = []) {
  const parserOpts = { plugins: [...initialPlugins] };
  const instance = instantiatePlugin({
    assertVersion: (version) => {
      if (typeof version === "number" && version !== 7) {
        throw new Error(`Unsupported Babel version: ${version}`);
      }
    }
  });
  applyManipulateOptions(instance, {}, parserOpts);
  return { instance, parserOpts };
}

test/contract.mjs

import assert from "node:assert/strict";
import syntaxOptionalCatchBindingModule from "@babel/plugin-syntax-optional-catch-binding";
import {
  syntaxOptionalCatchBinding,
  instantiatePlugin,
  applyManipulateOptions,
  configureParserOptions
} from "../src/index.mjs";

const rawPlugin =
  typeof syntaxOptionalCatchBindingModule === "function"
    ? syntaxOptionalCatchBindingModule
    : syntaxOptionalCatchBindingModule.default || syntaxOptionalCatchBindingModule;

// Contract 1: Plugin default export is a function factory asserting Babel 7 compatibility
{
  assert.equal(typeof syntaxOptionalCatchBinding, "function");
  assert.equal(typeof rawPlugin, "function");

  let assertedVersion = null;
  const api = {
    assertVersion: (v) => {
      assertedVersion = v;
    }
  };
  const pluginInstance = rawPlugin(api, {});
  assert.equal(assertedVersion, 7);
  assert.ok(pluginInstance);
}

// Contract 2: Plugin factory returns an object named syntax-optional-catch-binding with a manipulateOptions method
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  assert.equal(pluginInstance.name, "syntax-optional-catch-binding");
  assert.equal(typeof pluginInstance.manipulateOptions, "function");
}

// Contract 3: manipulateOptions appends optionalCatchBinding to parserOpts.plugins array
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  const parserOpts = { plugins: [] };
  applyManipulateOptions(pluginInstance, {}, parserOpts);
  assert.deepEqual(parserOpts.plugins, ["optionalCatchBinding"]);
}

// Contract 4: manipulateOptions preserves existing parser plugins while appending optionalCatchBinding
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  const parserOpts = { plugins: ["jsx", "typescript"] };
  applyManipulateOptions(pluginInstance, {}, parserOpts);
  assert.deepEqual(parserOpts.plugins, ["jsx", "typescript", "optionalCatchBinding"]);
}

// Contract 5: configureParserOptions helper instantiates plugin and configures parser plugins list
{
  const { instance, parserOpts } = configureParserOptions(["flow"]);
  assert.equal(instance.name, "syntax-optional-catch-binding");
  assert.deepEqual(parserOpts.plugins, ["flow", "optionalCatchBinding"]);
}

// Contract 6: Plugin instantiation throws error when incompatible Babel version is asserted
{
  const incompatibleApi = {
    assertVersion: (v) => {
      if (v === 7) {
        throw new Error("Babel 7 not supported in this test harness");
      }
    }
  };
  assert.throws(
    () => instantiatePlugin(incompatibleApi, {}),
    /Babel 7 not supported/
  );
}

console.log("All @babel/plugin-syntax-optional-catch-binding contract tests passed successfully.");

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