Why does "bower build" fail when trying to load packages from bower.herokuapp.com?

Issue

Your app uses Bower to install packages but in your build you see errors like Request to https://bower.herokuapp.com/packages/PACKAGE-NAME failed with 410

Resolution

You'll need to upgrade bower:
npm install -g bower

Alternatively you can put the following in your .bowerrc:

{
  "registry": "https://registry.bower.io"
}

This was an undocumented change to bower:
https://github.com/bower/bower/issues/2484

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