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@babel/plugin-syntax-optional-chaining 7.8.3: parse optional chaining syntax with @babel/plugin-syntax-optional-chaining

검증된 샘플 — npm @babel/plugin-syntax-optional-chaining 7.8.3: parse optional chaining syntax with @babel/plugin-syntax-optional-chaining. node 22 · linux…

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환경 컨트랙트 단계 실행일
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

케이스

HOW
목표
parse optional chaining syntax with @babel/plugin-syntax-optional-chaining
패키지
심벌
  • default
생성일
2026-08-27T21:36:08Z

컨트랙트

  1. exports default Babel plugin factory function asserting version 7
  2. returns plugin object named syntax-optional-chaining with manipulateOptions function
  3. manipulateOptions appends optionalChaining to parserOpts.plugins
  4. helper function configureOptionalChaining initializes plugin and configures parser plugins

파일

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

소스 아티팩트 내려받기 (tar.gz)

소스

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 optional chaining syntax with @babel/plugin-syntax-optional-chaining
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-optional-chaining@7.8.3
Demonstrate these symbols/APIs:
  - 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
{"case":{"caseId":"case:sha256:d07054578e233ca6ddf648fb1e8f9471a06d149d15244d90a17fc7658733a336","contract":["exports default Babel plugin factory function asserting version 7","returns plugin object named syntax-optional-chaining with manipulateOptions function","manipulateOptions appends optionalChaining to parserOpts.plugins","helper function configureOptionalChaining initializes plugin and configures parser plugins"],"goal":"parse optional chaining syntax with @babel/plugin-syntax-optional-chaining","kind":"HOW","packages":["pkg:npm/%40babel/plugin-syntax-optional-chaining@7.8.3"],"schemaVersion":1,"symbols":["default"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/plugin-syntax-optional-chaining@7.8.3"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-syntax-optional-chaining@7.8.3","symbols":["default"],"verifierAdapter":"node-typescript@1"}
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package.json
{
  "name": "sample-babel-plugin-syntax-optional-chaining",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-syntax-optional-chaining": "7.8.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "parse optional chaining syntax with @babel/plugin-syntax-optional-chaining",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-optional-chaining@7.8.3"
  ],
  "symbols": [
    "default"
  ]
}
src/index.mjs
import syntaxOptionalChaining from '@babel/plugin-syntax-optional-chaining';

/**
 * Creates and initializes the optional chaining syntax plugin instance.
 * @param {object} [api] - Optional Babel API object.
 * @param {object} [options] - Optional plugin options.
 * @returns {object} Plugin instance object with name and manipulateOptions.
 */
export function createOptionalChainingPlugin(api, options = {}) {
  const plugin = typeof syntaxOptionalChaining === 'function'
    ? syntaxOptionalChaining
    : (syntaxOptionalChaining.default || syntaxOptionalChaining);
  const babelApi = api || {
    assertVersion: (version) => Boolean(version)
  };
  return plugin(babelApi, options);
}

/**
 * Configure Babel parser options to enable optional chaining syntax support.
 * @param {object} [parserOpts] - Parser options object to mutate.
 * @param {object} [api] - Optional Babel API object.
 * @returns {{ name: string, parserPlugins: string[] }}
 */
export function configureOptionalChaining(parserOpts = { plugins: [] }, api) {
  const instance = createOptionalChainingPlugin(api);
  instance.manipulateOptions({}, parserOpts);

  return {
    name: instance.name,
    parserPlugins: parserOpts.plugins
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import syntaxOptionalChainingPlugin from '@babel/plugin-syntax-optional-chaining';
import { createOptionalChainingPlugin, configureOptionalChaining } from '../src/index.mjs';

// 1. Verify plugin export is callable and asserts Babel version 7
const plugin = typeof syntaxOptionalChainingPlugin === 'function'
  ? syntaxOptionalChainingPlugin
  : (syntaxOptionalChainingPlugin.default || syntaxOptionalChainingPlugin);
assert.equal(typeof plugin, 'function', 'Plugin export must be a function');

let assertedVersion = null;
const mockApi = {
  assertVersion(version) {
    assertedVersion = version;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7');

// 2. Verify plugin object structure and name
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'syntax-optional-chaining', 'Plugin name must be syntax-optional-chaining');
assert.equal(typeof instance.manipulateOptions, 'function', 'Plugin must provide manipulateOptions function');

// 3. Verify manipulateOptions appends optionalChaining to parserOpts.plugins
const parserOpts = { plugins: [] };
instance.manipulateOptions({}, parserOpts);
assert.deepEqual(parserOpts.plugins, ['optionalChaining'], 'manipulateOptions must push "optionalChaining" into parserOpts.plugins');

const existingParserOpts = { plugins: ['jsx'] };
instance.manipulateOptions({}, existingParserOpts);
assert.deepEqual(existingParserOpts.plugins, ['jsx', 'optionalChaining'], 'manipulateOptions must append "optionalChaining" to existing plugins');

// 4. Verify helper functions from src/index.mjs
const helperInstance = createOptionalChainingPlugin();
assert.equal(helperInstance.name, 'syntax-optional-chaining', 'Helper plugin must return valid plugin instance');

const customParserOpts = { plugins: [] };
const result = configureOptionalChaining(customParserOpts);
assert.equal(result.name, 'syntax-optional-chaining', 'Configured helper must return correct plugin name');
assert.deepEqual(result.parserPlugins, ['optionalChaining'], 'Configured parserPlugins must contain optionalChaining');
assert.deepEqual(customParserOpts.plugins, ['optionalChaining'], 'Input parserOpts must be mutated with optionalChaining');

console.log('Contract assertions passed.');

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