@babel/plugin-transform-react-jsx-self 7.29.7

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-transform-react-jsx-self@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-react-jsx-self@7.29.7

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-transform-react-jsx-self",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-react-jsx-self": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-react-jsx-self@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-react-jsx-self@7.29.7"
  ]
}

import * as babel from '@babel/core';
import reactJsxSelfPlugin from '@babel/plugin-transform-react-jsx-self';

/**
 * Creates and initializes the react-jsx-self plugin instance.
 * @param {object} [api] - Babel API object with types, template, traverse, assertVersion.
 * @param {object} [options] - Optional plugin options.
 * @returns {object} Plugin instance object with name and visitor.
 */
export function createReactJsxSelfPlugin(api, options = {}) {
  const plugin = reactJsxSelfPlugin.default || reactJsxSelfPlugin;
  const babelApi = api || {
    types: babel.types,
    template: babel.template,
    traverse: babel.traverse,
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Transforms JavaScript / JSX source code using @babel/plugin-transform-react-jsx-self.
 * @param {string} source - Source code to transform.
 * @param {object} [options] - Additional Babel transform options.
 * @returns {import('@babel/core').BabelFileResult} Babel transform result.
 */
export function transformReactJsxSelf(source, options = {}) {
  const plugin = reactJsxSelfPlugin.default || reactJsxSelfPlugin;
  return babel.transformSync(source, {
    plugins: [plugin],
    parserOpts: {
      plugins: ['jsx']
    },
    configFile: false,
    babelrc: false,
    ...options
  });
}

import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import reactJsxSelfPlugin from '@babel/plugin-transform-react-jsx-self';
import { createReactJsxSelfPlugin, transformReactJsxSelf } from '../src/index.mjs';

// 1. Plugin default export is a function factory created by Babel declare helper
const plugin = reactJsxSelfPlugin.default || reactJsxSelfPlugin;
assert.equal(typeof plugin, 'function', 'Plugin default export must be a function');

// 2. Plugin factory validates Babel version 7 via assertVersion
let assertedVersion = null;
const mockApi = {
  types: babel.types,
  template: babel.template,
  traverse: babel.traverse,
  assertVersion(v) {
    assertedVersion = v;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7');

// 3. Plugin factory returns a plugin object named transform-react-jsx-self with Program visitor
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-react-jsx-self', 'Plugin name must be transform-react-jsx-self');
assert.ok(instance.visitor && typeof instance.visitor.Program === 'function', 'Plugin must define Program visitor');

// 4. Transforms standalone JSX element by appending __self={this} attribute
const codeBasic = '<button onClick={handleClick}>Click me</button>;';
const resultBasic = transformReactJsxSelf(codeBasic);
assert.ok(resultBasic.code.includes('__self={this}'), 'Transformed JSX element must contain __self={this} attribute');
assert.equal(resultBasic.code.trim(), '<button onClick={handleClick} __self={this}>Click me</button>;', 'Transformed code must match expected output');

// 5. Transforms nested JSX elements by appending __self={this} to all opening elements
const codeNested = '<div className="container"><header><h1 title="hello">Title</h1></header></div>;';
const resultNested = transformReactJsxSelf(codeNested);
const occurrences = (resultNested.code.match(/__self=\{this\}/g) || []).length;
assert.equal(occurrences, 3, 'All 3 nested opening JSX elements must receive __self={this}');
assert.ok(resultNested.code.includes('<div className="container" __self={this}>'), 'Outer div must contain __self={this}');
assert.ok(resultNested.code.includes('<header __self={this}>'), 'Header must contain __self={this}');
assert.ok(resultNested.code.includes('<h1 title="hello" __self={this}>'), 'h1 must contain __self={this}');

// 6. Transforms JSX elements inside arrow functions preserving lexical this context
const codeArrow = 'const renderCard = (props) => <Card title={props.title}><Body /></Card>;';
const resultArrow = transformReactJsxSelf(codeArrow);
assert.ok(resultArrow.code.includes('<Card title={props.title} __self={this}>'), 'Card element inside arrow function must have __self={this}');
assert.ok(resultArrow.code.includes('<Body __self={this} />'), 'Body element inside arrow function must have __self={this}');

// 7. Transforms JSX elements inside class methods and base class constructors
const codeClass = `
class Widget {
  constructor() {
    this.initialView = <div id="init" />;
  }
  render() {
    return <section className="widget"><span /></section>;
  }
}
`;
const resultClass = transformReactJsxSelf(codeClass);
assert.ok(resultClass.code.includes('<div id="init" __self={this} />'), 'Base class constructor JSX must receive __self={this}');
assert.ok(resultClass.code.includes('<section className="widget" __self={this}>'), 'Class method JSX must receive __self={this}');
assert.ok(resultClass.code.includes('<span __self={this} />'), 'Class method nested JSX must receive __self={this}');

// 8. Does not attach __self to JSX elements inside derived class constructors before super call safety
const codeDerived = `
class CustomWidget extends Widget {
  constructor(props) {
    const earlyElement = <div id="early" />;
    super(props);
  }
  render() {
    return <div id="normal" />;
  }
}
`;
const resultDerived = transformReactJsxSelf(codeDerived);
assert.ok(resultDerived.code.includes('<div id="early" />'), 'Derived class constructor JSX must not receive __self={this}');
assert.ok(!resultDerived.code.includes('<div id="early" __self='), 'Derived constructor JSX must not have __self prop');
assert.ok(resultDerived.code.includes('<div id="normal" __self={this} />'), 'Derived class regular method JSX must receive __self={this}');

// 9. Helper functions correctly initialize plugin and transform source code containing JSX elements
const helperInstance = createReactJsxSelfPlugin();
assert.equal(helperInstance.name, 'transform-react-jsx-self', 'Helper plugin factory must return valid plugin instance');

const helperResult = transformReactJsxSelf('<App />');
assert.equal(helperResult.code.trim(), '<App __self={this} />;', 'Helper transform function must produce transformed code with __self={this}');

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