CodeSampleX

Sample

@babel/plugin-syntax-async-generators 7.8.4: parse async generator function syntax using @babel/plugin-syntax-async-generators

Verified sample for npm @babel/plugin-syntax-async-generators 7.8.4: parse async generator function syntax using @babel/plugin-syntax-async-generators. The…

sha256:e8d76b8054a579c05a5b0c37864379a38051fbd536a346e5ec7e1debc67368ff

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
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…		 2026-08-26

Case

HOW
Goal
parse async generator function syntax using @babel/plugin-syntax-async-generators
Packages
Symbols
  • @babel/plugin-syntax-async-generators
Environment
node 22.23.2
Created
2026-08-26T14:17:25Z

Contract

  1. plugin exports a default plugin factory asserting Babel 7 compatibility
  2. plugin factory returns plugin descriptor with name syntax-async-generators
  3. manipulateOptions appends asyncGenerators to parser plugins list
  4. manipulateOptions preserves existing parser plugins when adding asyncGenerators
  5. configureParserOptions helper creates plugin instance and updates parserOpts
  6. hasAsyncGeneratorsSyntax accurately checks presence of asyncGenerators in parser options

Files

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

Download the source artifact (tar.gz)

Source

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: parse async generator function syntax using @babel/plugin-syntax-async-generators
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-async-generators@7.8.4
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
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package-lock.json
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package.json
{
  "name": "sample-babel-plugin-syntax-async-generators",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-syntax-async-generators": "7.8.4"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "parse async generator function syntax using @babel/plugin-syntax-async-generators",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-async-generators@7.8.4"
  ],
  "symbols": [
    "@babel/plugin-syntax-async-generators"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import rawPlugin from "@babel/plugin-syntax-async-generators";

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

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

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

export function configureParserOptions(parserOpts = {}, options = {}, api = {}) {
  const instance = createPluginInstance(api, options);
  return applySyntaxPlugin(instance, parserOpts);
}

export function hasAsyncGeneratorsSyntax(parserOpts = {}) {
  return Array.isArray(parserOpts.plugins) && parserOpts.plugins.includes("asyncGenerators");
}
test/contract.mjs
import assert from "node:assert/strict";
import rawPluginModule from "@babel/plugin-syntax-async-generators";
import {
  pluginSyntaxAsyncGenerators,
  createPluginInstance,
  applySyntaxPlugin,
  configureParserOptions,
  hasAsyncGeneratorsSyntax
} from "../src/index.mjs";

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

// Contract 1: plugin exports a default plugin factory asserting Babel 7 compatibility
{
  assert.equal(typeof pluginSyntaxAsyncGenerators, "function");
  assert.equal(typeof rawPlugin, "function");

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

  const failingApi = {
    assertVersion: (v) => {
      if (v !== 7) throw new Error(`Unsupported version: ${v}`);
      throw new Error("Simulated version mismatch");
    }
  };
  assert.throws(() => rawPlugin(failingApi, {}), /Simulated version mismatch/);
}

// Contract 2: plugin factory returns plugin descriptor with name syntax-async-generators
{
  const api = {
    assertVersion: () => {}
  };
  const instance = createPluginInstance(api, {});
  assert.equal(typeof instance, "object");
  assert.equal(instance.name, "syntax-async-generators");
  assert.equal(typeof instance.manipulateOptions, "function");
}

// Contract 3: manipulateOptions appends asyncGenerators to parser plugins list
{
  const instance = createPluginInstance({ assertVersion: () => {} });
  const parserOpts = { plugins: ["typescript"] };

  applySyntaxPlugin(instance, parserOpts);

  assert.deepEqual(parserOpts.plugins, ["typescript", "asyncGenerators"]);
}

// Contract 4: manipulateOptions preserves existing parser plugins when adding asyncGenerators
{
  const instance = createPluginInstance({ assertVersion: () => {} });
  const initialPlugins = ["jsx", "decorators-legacy", "dynamicImport"];
  const parserOpts = { plugins: [...initialPlugins] };

  applySyntaxPlugin(instance, parserOpts);

  assert.equal(parserOpts.plugins.length, 4);
  assert.deepEqual(parserOpts.plugins.slice(0, 3), initialPlugins);
  assert.equal(parserOpts.plugins[3], "asyncGenerators");
}

// Contract 5: configureParserOptions helper creates plugin instance and updates parserOpts
{
  const emptyParserOpts = {};
  const result = configureParserOptions(emptyParserOpts);

  assert.ok(Array.isArray(result.plugins));
  assert.ok(result.plugins.includes("asyncGenerators"));
  assert.equal(emptyParserOpts, result);
}

// Contract 6: hasAsyncGeneratorsSyntax accurately checks presence of asyncGenerators in parser options
{
  assert.equal(hasAsyncGeneratorsSyntax({}), false);
  assert.equal(hasAsyncGeneratorsSyntax({ plugins: ["jsx", "flow"] }), false);
  assert.equal(hasAsyncGeneratorsSyntax({ plugins: ["jsx", "asyncGenerators"] }), true);
}

console.log("All @babel/plugin-syntax-async-generators contract tests passed successfully.");

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