Why is this 'idiom' of inheritance being introduced into the code:

PointLight.prototype = Object.assign( Object.create( Light.prototype ), {

Seriously? Function(nested Function(ParentPrototype) COMMA SHOTGUN BRACKET?

The faithful two line style still in, for example, the Materials classes are much clearer and cleaner. Assign the prototype and then set the constructor. The end. Please don't ruin the library by catching JavaScript disease - the bizarre need to masturbate the way objects and inheritance are coded. One style throughout the library. No need to change it.