CodeSampleX

Sample

@babel/plugin-syntax-top-level-await 7.14.5: default

Verified sample for npm @babel/plugin-syntax-top-level-await 7.14.5: default. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:0f9fb92d2bfed684a48d1b386ad3ce83ed834aed57994e9a09a0e73d435c2350

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 linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
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…		 2026-09-05

Case

HOW
Goal
verify @babel/plugin-syntax-top-level-await.default in pkg:npm/%40babel/plugin-syntax-top-level-await@7.14.5
Packages
Symbols
  • @babel/plugin-syntax-top-level-await.default
Created
2026-09-05T21:51:10Z

Contract

  1. Plugin default export is a function factory asserting Babel 7 compatibility
  2. Plugin factory returns an object named syntax-top-level-await with a manipulateOptions method
  3. manipulateOptions appends topLevelAwait to parserOpts.plugins array
  4. manipulateOptions preserves existing parser plugins while appending topLevelAwait
  5. configureParserOptions helper instantiates plugin and configures parser plugins list
  6. Plugin instantiation throws error when incompatible Babel version is asserted

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: verify @babel/plugin-syntax-top-level-await.default in pkg:npm/%40babel/plugin-syntax-top-level-await@7.14.5
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-top-level-await@7.14.5
Demonstrate these symbols/APIs:
  - @babel/plugin-syntax-top-level-await.default

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-top-level-await",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-syntax-top-level-await": "7.14.5"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/plugin-syntax-top-level-await.default in pkg:npm/%40babel/plugin-syntax-top-level-await@7.14.5",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-top-level-await@7.14.5"
  ],
  "symbols": [
    "@babel/plugin-syntax-top-level-await.default"
  ]
}
src/index.mjs
import syntaxTopLevelAwaitModule from "@babel/plugin-syntax-top-level-await";

export const syntaxTopLevelAwait =
  typeof syntaxTopLevelAwaitModule === "function"
    ? syntaxTopLevelAwaitModule
    : syntaxTopLevelAwaitModule.default || syntaxTopLevelAwaitModule;

export function instantiatePlugin(api = {}, options = {}) {
  const normalizedApi = {
    assertVersion: (range) => {
      if (typeof api.assertVersion === "function") {
        api.assertVersion(range);
      }
    },
    ...api
  };
  return syntaxTopLevelAwait(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 syntaxTopLevelAwaitModule from "@babel/plugin-syntax-top-level-await";
import {
  syntaxTopLevelAwait,
  instantiatePlugin,
  applyManipulateOptions,
  configureParserOptions
} from "../src/index.mjs";

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

// Contract 1: Plugin default export is a function factory asserting Babel 7 compatibility
{
  assert.equal(typeof syntaxTopLevelAwait, "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-top-level-await with a manipulateOptions method
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  assert.equal(pluginInstance.name, "syntax-top-level-await");
  assert.equal(typeof pluginInstance.manipulateOptions, "function");
}

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

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

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

// 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-top-level-await contract tests passed successfully.");

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