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

Usage

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"],
});