rmwc/react-versions/react-16.0.x/node_modules/core-js/library/modules/$.defined.js

A thin React wrapper for Material Design (Web) Components

// 7.2.1 RequireObjectCoercible(argument)
module.exports = function(it){
  if(it == undefined)throw TypeError("Can't call method on  " + it);
  return it;
};