I guess any polyfill with self reference instead of window will do (for example promise-polyfill/polyfill.js at master 路 taylorhakes/promise-polyfill 路 GitHub) .
Adding this kind of global object detection method (self->window->global) to the PromisePolyfill.Apply method (in BJS) will allow you to use this polyfill in webworkers as well (not tested, just a thought 
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