@babel/plugin-syntax-private-property-in-object 7.14.5: verify private property in object syntax parsing with @babel/plugin-syntax-private-property-in-object

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.

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Goal: verify private property in object syntax parsing with @babel/plugin-syntax-private-property-in-object
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-private-property-in-object@7.14.5
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.
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  - Keep it under 200 files and 256KB packed.

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import * as babel from '@babel/core';
import syntaxPluginImport from '@babel/plugin-syntax-private-property-in-object';

export const syntaxPrivatePropertyInObjectPlugin =
  typeof syntaxPluginImport === 'function'
    ? syntaxPluginImport
    : syntaxPluginImport?.default || syntaxPluginImport;

/**
 * Parses and transforms source code using @babel/plugin-syntax-private-property-in-object.
 *
 * @param {string} sourceCode - The JavaScript source code containing private property `in` syntax.
 * @param {object} [options] - Optional Babel transform configuration options.
 * @returns {{ code: string, ast: object }} The transformed code and parsed AST.
 */
export function parsePrivatePropertyInObject(sourceCode, options = {}) {
  const result = babel.transformSync(sourceCode, {
    configFile: false,
    babelrc: false,
    ast: true,
    plugins: [
      syntaxPrivatePropertyInObjectPlugin,
      ...(options.plugins || [])
    ],
    ...options
  });

  return {
    code: result?.code ?? '',
    ast: result?.ast ?? null
  };
}

/**
 * Inspects parsed AST to find all private `in` expressions (#field in object).
 *
 * @param {object} ast - The Babel AST.
 * @returns {Array<{ field: string, target: string }>} Array of privateIn occurrences found in AST.
 */
export function extractPrivateInExpressions(ast) {
  const matches = [];
  babel.traverse(ast, {
    BinaryExpression(path) {
      if (path.node.operator === 'in' && path.node.left.type === 'PrivateName') {
        matches.push({
          field: path.node.left.id.name,
          target: path.node.right.type === 'Identifier' ? path.node.right.name : path.node.right.type
        });
      }
    }
  });
  return matches;
}

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{
  "name": "sample-babel-plugin-syntax-private-property-in-object",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.29.7",
    "@babel/plugin-syntax-private-property-in-object": "7.14.5"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify private property in object syntax parsing with @babel/plugin-syntax-private-property-in-object",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-private-property-in-object@7.14.5"
  ],
  "symbols": [
    "default"
  ]
}

import assert from 'node:assert';
import { parsePrivatePropertyInObject, extractPrivateInExpressions, syntaxPrivatePropertyInObjectPlugin } from '../index.mjs';

console.log('Running contract tests for @babel/plugin-syntax-private-property-in-object...');

// Assertion 1: Plugin manipulates parser options to enable privateIn
{
  const parserOpts = { plugins: [] };
  const pluginInstance = syntaxPrivatePropertyInObjectPlugin({ assertVersion: () => true });
  pluginInstance.manipulateOptions({}, parserOpts);
  assert.ok(
    parserOpts.plugins.includes('privateIn'),
    'Plugin must configure parserOpts to include privateIn'
  );
  console.log('✔ Assertion 1 passed: Parser options configured with privateIn');
}

// Assertion 2: Parses private property in expressions within instance and static methods
{
  const inputCode = `
    class Validator {
      #token = 'secret';
      static #registered = true;

      hasToken(obj) {
        return #token in obj;
      }

      static isRegistered(obj) {
        return #registered in obj;
      }
    }
  `;

  const { code, ast } = parsePrivatePropertyInObject(inputCode);
  assert.ok(code.includes('#token in obj'), 'Output code should contain #token in obj');
  assert.ok(code.includes('#registered in obj'), 'Output code should contain #registered in obj');
  assert.ok(ast, 'AST must be generated');

  const expressions = extractPrivateInExpressions(ast);
  assert.strictEqual(expressions.length, 2, 'Should find 2 private in expressions');
  assert.deepStrictEqual(expressions, [
    { field: 'token', target: 'obj' },
    { field: 'registered', target: 'obj' }
  ]);
  console.log('✔ Assertion 2 passed: Instance and static method private in parsing');
}

// Assertion 3: Generates valid BinaryExpression AST with PrivateName
{
  const inputCode = `
    class Cache {
      #entry;
      constructor(source) {
        if (#entry in source) {
          this.cached = true;
        }
      }
    }
  `;

  const { ast } = parsePrivatePropertyInObject(inputCode);
  const expressions = extractPrivateInExpressions(ast);
  assert.strictEqual(expressions.length, 1);
  assert.strictEqual(expressions[0].field, 'entry');
  assert.strictEqual(expressions[0].target, 'source');
  console.log('✔ Assertion 3 passed: Valid BinaryExpression AST with PrivateName in constructor');
}

// Assertion 4: Complex expressions (logical and ternary)
{
  const inputCode = `
    class MultiCheck {
      #a;
      #b;
      verify(target) {
        const result = (#a in target && !(#b in target)) ? "valid" : "invalid";
        return result;
      }
    }
  `;

  const { ast } = parsePrivatePropertyInObject(inputCode);
  const expressions = extractPrivateInExpressions(ast);
  assert.strictEqual(expressions.length, 2);
  assert.strictEqual(expressions[0].field, 'a');
  assert.strictEqual(expressions[1].field, 'b');
  console.log('✔ Assertion 4 passed: Complex expressions with logical operators and ternaries');
}

console.log('All contract assertions passed successfully.');