babel-plugin-transform-remove-undefined
For functions, this removes return arguments that evaluate to undefined
.
Example
In
let a = void 0;
function foo() {
var b = undefined;
return undefined;
}
Out
let a;
function foo() {
var b;
return;
}
Installation
npm install babel-plugin-transform-remove-undefined --save-dev
Usage
With a configuration file (Recommended)
{
"plugins": ["babel-plugin-transform-remove-undefined"]
}
Via CLI
babel --plugins babel-plugin-transform-remove-undefined script.js
Via Node API
require("@babel/core").transform("code", {
plugins: ["babel-plugin-transform-remove-undefined"]
});
Options
-
tdz
- Detect usages before declaration/initialization in let/const(throws) and var(void 0)
You can read more about configuring plugin options here