How can I find package dependencies?

I’d like to completely remove blaze and spacebars from my project. I’ve removed them at the top level in .meteor/packages but they still exist in .meteor/versions because other packages depend on them. I have too many packages to go through one by one, and their dependencies may be nested.

How can I quickly find any and all packages that use blaze and spacebars?

My best solution so far is to just grep through .meteor/local/build/programs/web.browser/packages for each package (see below). But this is cumbersome and there should be a better solution.

Is there a better solution or should I add this as a feature request?

grep -r 'Package.blaze' .meteor/local/build/programs/web.browser/packages