@babel/plugin-transform-react-jsx-source 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-source@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-react-jsx-source@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-source",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-react-jsx-source": "7.29.7"
  }
}

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

import * as babel from '@babel/core';
import reactJsxSourcePlugin from '@babel/plugin-transform-react-jsx-source';

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

/**
 * Transforms JSX source code using @babel/plugin-transform-react-jsx-source.
 * @param {string} source - Source code containing JSX to transform.
 * @param {object} [options] - Additional Babel transform options.
 * @returns {import('@babel/core').BabelFileResult} Babel transform result.
 */
export function transformReactJsxSource(source, options = {}) {
  const plugin = reactJsxSourcePlugin.default || reactJsxSourcePlugin;
  const parserPlugins = ['jsx'];
  if (options.parserOpts && options.parserOpts.plugins) {
    parserPlugins.push(...options.parserOpts.plugins);
  }

  const { parserOpts, plugins, filename, ...restOptions } = options;

  return babel.transformSync(source, {
    filename: filename || 'sample.jsx',
    configFile: false,
    babelrc: false,
    parserOpts: {
      plugins: parserPlugins,
      ...parserOpts
    },
    plugins: [
      plugin,
      ...(plugins || [])
    ],
    ...restOptions
  });
}

import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import reactJsxSourcePlugin from '@babel/plugin-transform-react-jsx-source';
import { createReactJsxSourcePlugin, transformReactJsxSource } from '../src/index.mjs';

// 1. Plugin default export is a function factory asserting Babel version 7 compatibility
const plugin = reactJsxSourcePlugin.default || reactJsxSourcePlugin;
assert.equal(typeof plugin, 'function', 'Plugin default export must be a function');

let assertedVersionRange = null;
const mockApi = {
  types: babel.types,
  template: babel.template,
  assertVersion(range) {
    assertedVersionRange = range;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersionRange, 7, 'Plugin must assert Babel version 7 compatibility');

// 2. Plugin factory returns a plugin object named transform-react-jsx-source with JSXOpeningElement visitor
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-react-jsx-source', 'Plugin name must be transform-react-jsx-source');
assert.ok(instance.visitor && typeof instance.visitor.JSXOpeningElement === 'function', 'Plugin must define JSXOpeningElement visitor');

// 3. Injects __source attribute with fileName, lineNumber, and columnNumber into JSXOpeningElement
const sampleCode = 'const el = <div className="card">Content</div>;';
const sampleResult = transformReactJsxSource(sampleCode, { filename: 'components/Card.jsx' });
assert.ok(sampleResult.code.includes('__source='), 'Transformed code must contain __source prop');
assert.ok(sampleResult.code.includes('fileName:'), 'Transformed code must contain fileName in __source');
assert.ok(sampleResult.code.includes('lineNumber:'), 'Transformed code must contain lineNumber in __source');
assert.ok(sampleResult.code.includes('columnNumber:'), 'Transformed code must contain columnNumber in __source');

// 4. Injects fileName variable declaration at program scope matching provided filename
const customFilename = 'src/views/Header.jsx';
const headerResult = transformReactJsxSource('<header>Title</header>;', { filename: customFilename });
assert.ok(headerResult.code.includes(customFilename), 'Transformed code must reference specified filename');
assert.ok(headerResult.code.includes('_jsxFileName'), 'Transformed code must declare _jsxFileName identifier');

// 5. Calculates 1-based columnNumber and lineNumber from AST node loc start position
const buttonCode = '<button>Click</button>;';
const buttonResult = transformReactJsxSource(buttonCode, { filename: 'Button.jsx' });
assert.ok(buttonResult.code.includes('lineNumber: 1'), 'Line number must be 1 for first line JSX element');
assert.ok(buttonResult.code.includes('columnNumber: 1'), 'Column number must be 1 (1-based index) for element starting at column 0');

// 6. Preserves existing __source attribute on JSXOpeningElement without duplicate injection
const preExistingSourceCode = 'const pre = <span __source={{ fileName: "custom.jsx", lineNumber: 99, columnNumber: 3 }}>Text</span>;';
const preResult = transformReactJsxSource(preExistingSourceCode, { filename: 'Override.jsx' });
const occurrences = (preResult.code.match(/__source=/g) || []).length;
assert.equal(occurrences, 1, 'Pre-existing __source attribute should not receive duplicate injection');
assert.ok(preResult.code.includes('lineNumber: 99'), 'Pre-existing __source values must be preserved');

// 7. Handles nested JSX elements injecting independent source locations for each element
const nestedCode = `<div>
  <span>Child</span>
</div>;`;
const nestedResult = transformReactJsxSource(nestedCode, { filename: 'Nested.jsx' });
assert.ok(nestedResult.code.includes('lineNumber: 1'), 'Root element should have lineNumber 1');
assert.ok(nestedResult.code.includes('lineNumber: 2'), 'Nested child element should have lineNumber 2');

// 8. Handles JSX elements without location metadata without error
const nodeWithoutLoc = {
  attributes: []
};
const dummyPath = {
  node: nodeWithoutLoc,
  scope: {
    generateUidIdentifier: () => ({ name: '_jsxFileName' }),
    getProgramParent: () => ({ push: () => {} })
  }
};
assert.doesNotThrow(() => {
  instance.visitor.JSXOpeningElement(dummyPath, {});
}, 'Visitor should handle JSX opening element lacking loc without throwing');
assert.equal(nodeWithoutLoc.attributes.length, 0, 'No attributes should be injected when loc is missing');

// 9. Helper functions createReactJsxSourcePlugin and transformReactJsxSource correctly transform JSX source code
const helperPluginInstance = createReactJsxSourcePlugin();
assert.equal(helperPluginInstance.name, 'transform-react-jsx-source', 'Helper plugin must return valid plugin instance');

const helperResult = transformReactJsxSource('<p>Helper test</p>', { filename: 'Helper.jsx' });
assert.ok(helperResult.code.length > 0, 'Helper transform function must produce transformed code');
assert.ok(helperResult.code.includes('__source='), 'Helper transformed code must contain __source attribute');

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