babel-plugin-transform-private-to-hash

A Babel plugin that transforms ES2022+ private class fields/methods into public properties with hashed names, supporting configurable salt and hash length.

Features

• 🔒 Converts private fields/methods to uniquely hashed public properties
• 🧂 Configurable salt for hash generation
• 📏 Customizable hash length (1-8 chars)
• 🚫 Configurable enumerability (default: false)
• 💪 Full support for static/instance properties and methods
• ✅ Handles in operator checks correctly

Installation

1npm install --save-dev babel-plugin-transform-private-to-hash

Usage

Via .babelrc

1{
2  "plugins": [
3    ["transform-private-to-hash", {
4      "salt": "my-secret-salt",
5      "enumerable": false,
6      "hashLength": 8
7    }]
8  ]
9}

Configuration Options

Option	Type	Default	Description
salt	string	''	Salt value for hash generation
enumerable	boolean	false	Whether the transformed properties should be enumerable
hashLength	number	8	Length of the hash substring (1-32)

Examples

Basic Transformation

Input:

1class MyClass {
2  #privateField = 42;
3  #method() {}
4  static #staticField = 10;
5
6  check() {
7    return #privateField in this && this.#method();
8  }
9}

Output (with default config):

1class MyClass {
2  constructor() {
3    Object.defineProperty(this, "__e5f6g7h8", {
4      value: 42,
5      enumerable: false,
6      configurable: true,
7      writable: true
8    });
9  }
10
11  __i9j0k1l2() {}
12
13  check() {
14    return "__e5f6g7h8" in this && this.__i9j0k1l2();
15  }
16
17  static {
18    Object.defineProperty(this, "__a1b2c3d4", {
19      value: 10,
20      enumerable: false,
21      configurable: true,
22      writable: true
23    });
24  }
25}

Configurable Hash Length

Config:

1{ "hashLength": 4 }

Output Property Name:

1__a1b2

Enumerable Mode

Config:

1{ "enumerable": true }

Output:

1class MyClass {
2  __a1b2c3d4 = 42;
3  static __e5f6g7h8 = 10;
4}