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

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.

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{
  "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"
  }
}

{
  "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"
  ]
}

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 };
}

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.");