CodeSampleX

Sample

@babel/plugin-syntax-jsx 7.29.7: plugin-syntax-jsx

Verified sample for npm @babel/plugin-syntax-jsx 7.29.7: plugin-syntax-jsx. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:076ccf3fcada1f330e79200daa2c3af2634969e00db6bdb237c7a4076b3fe7b8

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 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

Case

HOW
Goal
verify pkg:npm/%40babel/plugin-syntax-jsx@7.29.7
Packages
Symbols
  • @babel/plugin-syntax-jsx
Created
2026-08-27T21:30:43Z

Contract

  1. exports default Babel plugin factory function asserting version compatibility
  2. returns plugin object named syntax-jsx with manipulateOptions function
  3. manipulateOptions appends jsx to parserOpts.plugins when typescript is absent
  4. manipulateOptions skips appending jsx if typescript plugin is present
  5. helper function configureJsxSyntax initializes plugin and configures parser plugins

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 pkg:npm/%40babel/plugin-syntax-jsx@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-jsx@7.29.7
Demonstrate these symbols/APIs:
  - @babel/plugin-syntax-jsx

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-jsx",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-syntax-jsx": "7.29.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-syntax-jsx@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-jsx@7.29.7"
  ],
  "symbols": [
    "@babel/plugin-syntax-jsx"
  ]
}
src/index.mjs
import syntaxJsx from '@babel/plugin-syntax-jsx';

/**
 * Creates and initializes the JSX 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 createJsxSyntaxPlugin(api, options = {}) {
  const plugin = syntaxJsx.default || syntaxJsx;
  const babelApi = api || {
    assertVersion: (version) => Boolean(version)
  };
  return plugin(babelApi, options);
}

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

  return {
    name: instance.name,
    parserPlugins: parserOpts.plugins
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import syntaxJsxPlugin from '@babel/plugin-syntax-jsx';
import { createJsxSyntaxPlugin, configureJsxSyntax } from '../src/index.mjs';

// 1. Verify export is plugin factory function and asserts Babel version compatibility
const plugin = syntaxJsxPlugin.default || syntaxJsxPlugin;
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.ok(assertedVersion !== null, 'Plugin must assert Babel version');
assert.match(String(assertedVersion), /7/, 'Plugin asserted version must target Babel 7+');

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

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

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

// 4. Verify manipulateOptions skips appending jsx if typescript plugin is present
const tsParserOpts = { plugins: ['typescript'] };
instance.manipulateOptions({}, tsParserOpts);
assert.deepEqual(tsParserOpts.plugins, ['typescript'], 'manipulateOptions must skip adding "jsx" when "typescript" plugin is present');

// 5. Verify helper functions from src/index.mjs
const helperInstance = createJsxSyntaxPlugin();
assert.equal(helperInstance.name, 'syntax-jsx', 'Helper plugin must return valid plugin instance');

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

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

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