@babel/helper-plugin-utils 8.0.1: verify declare from @babel/helper-plugin-utils

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 declare from @babel/helper-plugin-utils
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/helper-plugin-utils@8.0.1
Demonstrate these symbols/APIs:
  - declare

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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      "license": "MIT",
      "peer": true,
      "bin": {
        "json5": "lib/cli.js"
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      "engines": {
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      }
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      "license": "BlueOak-1.0.0",
      "peer": true,
      "engines": {
        "node": "20 || >=22"
      }
    },
    "node_modules/node-releases": {
      "version": "2.0.53",
      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.53.tgz",
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        },
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        "picocolors": "^1.1.1"
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}

{
  "name": "sample-babel-helper-plugin-utils",
  "version": "1.0.0",
  "type": "module",
  "description": "Minimal sample verifying @babel/helper-plugin-utils",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/helper-plugin-utils": "8.0.1"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify declare from @babel/helper-plugin-utils",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/helper-plugin-utils@8.0.1"
  ],
  "symbols": [
    "declare"
  ]
}

import { declare, declarePreset } from '@babel/helper-plugin-utils';

/**
 * Creates a Babel plugin using the declare helper.
 * @param {Function} builder - Plugin factory function receiving (api, options, dirname).
 * @returns {Function} Wrapped plugin function.
 */
export function createPlugin(builder) {
  return declare(builder);
}

/**
 * Creates a Babel preset using the declarePreset helper.
 * @param {Function} builder - Preset factory function receiving (api, options, dirname).
 * @returns {Function} Wrapped preset function.
 */
export function createPreset(builder) {
  return declarePreset(builder);
}

export { declare, declarePreset };

import assert from 'node:assert';
import { createPlugin, createPreset, declare, declarePreset } from '../src/index.js';

async function runContract() {
  // 1. declare wraps a plugin factory function and forwards api, options, and dirname
  let receivedApi = null;
  let receivedOptions = null;
  let receivedDirname = null;

  const samplePlugin = createPlugin((api, options, dirname) => {
    receivedApi = api;
    receivedOptions = options;
    receivedDirname = dirname;
    return {
      name: 'sample-transform',
      visitor: {},
      extra: options.customOption,
    };
  });

  const dummyApi = {
    version: '8.0.1',
    assertVersion: (range) => range,
  };

  const pluginResult = samplePlugin(dummyApi, { customOption: 'active' }, '/project/dir');
  assert.strictEqual(pluginResult.name, 'sample-transform');
  assert.strictEqual(pluginResult.extra, 'active');
  assert.strictEqual(receivedApi.version, '8.0.1');
  assert.deepStrictEqual(receivedOptions, { customOption: 'active' });
  assert.strictEqual(receivedDirname, '/project/dir');

  // 2. declare polyfills api.assertVersion when not present and throws BABEL_VERSION_UNSUPPORTED on version mismatch
  const pluginWithAssertion = declare((api) => {
    api.assertVersion('^8.0.0');
    return { name: 'versioned-plugin' };
  });

  const apiWithoutAssert = { version: '8.0.1' };
  assert.throws(
    () => {
      pluginWithAssertion(apiWithoutAssert, {});
    },
    (err) => {
      assert.strictEqual(err.code, 'BABEL_VERSION_UNSUPPORTED');
      assert.strictEqual(err.version, '8.0.1');
      assert.strictEqual(err.range, '^8.0.0');
      assert.match(err.message, /Requires Babel "\^8\.0\.0", but was loaded with "8\.0\.1"/);
      return true;
    },
    'should throw BABEL_VERSION_UNSUPPORTED when assertVersion is polyfilled'
  );

  // 3. declare polyfills api.assertVersion validating integer numbers into range strings and rejecting invalid types
  const pluginWithNumericVersion = declare((api) => {
    api.assertVersion(8);
    return { name: 'numeric-plugin' };
  });

  assert.throws(
    () => {
      pluginWithNumericVersion(apiWithoutAssert, {});
    },
    (err) => {
      assert.strictEqual(err.code, 'BABEL_VERSION_UNSUPPORTED');
      assert.strictEqual(err.range, '^8.0.0-0');
      return true;
    },
    'numeric range 8 should expand to ^8.0.0-0'
  );

  const pluginWithInvalidRange = declare((api) => {
    api.assertVersion(8.5);
  });

  assert.throws(
    () => {
      pluginWithInvalidRange(apiWithoutAssert, {});
    },
    {
      name: 'Error',
      message: 'Expected string or integer value.',
    },
    'non-integer number should throw invalid range error'
  );

  // 4. declare preserves pre-existing api.assertVersion without overwriting it
  let customAssertVersionCalled = false;
  let customAssertVersionArg = null;

  const apiWithCustomAssert = {
    version: '8.0.1',
    assertVersion: (range) => {
      customAssertVersionCalled = true;
      customAssertVersionArg = range;
    },
  };

  const customPlugin = declare((api) => {
    api.assertVersion('^8.0.0');
    return { name: 'custom-plugin' };
  });

  const customResult = customPlugin(apiWithCustomAssert, {});
  assert.strictEqual(customAssertVersionCalled, true);
  assert.strictEqual(customAssertVersionArg, '^8.0.0');
  assert.strictEqual(customResult.name, 'custom-plugin');

  // 5. declare defaults undefined or null options to an empty object when invoking the builder
  let optionsReceived = null;
  const pluginCheckingOptions = declare((api, options) => {
    optionsReceived = options;
    return { name: 'default-options-plugin' };
  });

  pluginCheckingOptions(apiWithCustomAssert, undefined);
  assert.deepStrictEqual(optionsReceived, {}, 'undefined options should default to empty object');

  pluginCheckingOptions(apiWithCustomAssert, null);
  assert.deepStrictEqual(optionsReceived, {}, 'null options should default to empty object');

  // 6. declarePreset aliases declare and wraps preset builder functions with the same API forwarding and polyfills
  assert.strictEqual(typeof declarePreset, 'function');
  assert.strictEqual(declarePreset, declare);

  const samplePreset = createPreset((api, options, dirname) => {
    return {
      plugins: ['@babel/plugin-transform-block-scoping'],
      presets: [],
      targetDir: dirname,
      options,
    };
  });

  const presetResult = samplePreset(apiWithCustomAssert, { loose: true }, '/src');
  assert.deepStrictEqual(presetResult.plugins, ['@babel/plugin-transform-block-scoping']);
  assert.strictEqual(presetResult.targetDir, '/src');
  assert.deepStrictEqual(presetResult.options, { loose: true });

  console.log('Contract tests passed successfully.');
}

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});