babel-plugin-transform-remove-undefined
For variable assignments, this removes rvals that evaluate to undefined
(var
s in functions only).
For functions, this removes return arguments that evaluate to undefined
.
Example
In
let a = void 0; { var b = undefined; return undefined;}
Out
let a; { var b; return;}
Installation
npm install babel-plugin-transform-remove-undefined --save-dev
Usage
.babelrc
(Recommended)
Via .babelrc
Via CLI
babel --plugins babel-plugin-transform-remove-undefined script.js
Via Node API
;
Options
tdz
- Detect usages before declaration/initialization in let/const(throws) and var(void 0)