babel-plugin-transform-undefined-to-void

This plugin transforms undefined into void 0 which returns undefined regardless of if it's been reassigned.

Example

In

JavaScript

foo === undefined;

Out

JavaScript

foo === void 0;

Installation

npm

npm install babel-plugin-transform-undefined-to-void --save-dev

Yarn

yarn add babel-plugin-transform-undefined-to-void --dev

pnpm

pnpm add babel-plugin-transform-undefined-to-void --save-dev

Usage

With a configuration file (Recommended)

babel.config.json

{
  "plugins": ["transform-undefined-to-void"]
}

Via CLI

Shell

babel --plugins transform-undefined-to-void script.js

Via Node API

JavaScript

require("@babel/core").transformSync("code", {
  plugins: ["transform-undefined-to-void"],
});