window is not defined

[marbemac]

A recent change (linked below) removed undefined checks on a variety of globals. This causes exceptions in certain environments, for example web workers. If debug is included in a library used in a web worker, it will fail, since web workers do not have global window objects.

I would propose just adding the undefined checks back to the start of the if statements in the code linked below.

cae07b7

[marbemac]

Ok I just went ahead and create a quick little PR: #462. Moving conversation over there.