Web Worker compatibility

Over at jsdom, our web worker test fail if we update our dependencies. Here is the error that I got:

ReferenceError: window is not defined at https://github.com/visionmedia/debug/blob/17d0e0bb49b46f53bd97aa6d7b56bf9990a8cb62/browser.js#L13

This line is missing a typeof window !== 'undefined' check. This check is present in other locations in this file, so this issue looks like a small oversight.

After #378 is resolved, you might be interested in https://www.npmjs.com/package/karma-mocha-webworker @yamikuronue

[Joris-van-der-Wel]

This should be fixed for 2.5.x Can you confirm?

Almost 😉, the issue still occurs on line 185:

/** Attach to Window*/
if (window) {
  window.debug = exports;
}

This line should be if (typeof window !== 'undefined') {

Alternatively, you could replace all instances of window with self. This works within a worker, but also outside of a worker.

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I noticed that a lot of other modules pin debug to specific versions instead of using a version range, I end up with 13 different copies of debug in jsdom. Luckily the only one that ends up in my browserify bundle is pinned at ^2.0.0.

[thebigredgeek]

On it right now. Merry Christmas everyone!