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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;
function foo() {
var b = undefined;
return undefined;
}
Out
let a;
function foo() {
var b;
return;
}
Installation
npm install babel-plugin-transform-remove-undefined
Usage
Via .babelrc
(Recommended)
.babelrc
{
"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"]
});