See:

• https://github.com/componentjs/spec/blob/master/component.json/specifications.md
  This is kind of old, and redundant in most cases with a package.json

• but still used in the wild: https://github.com/search?q=path%3A*/component.json&type=code

• See https://github.com/Stuk/jszip/blob/2ceb998e29d4171b4f3f2ecab1a2195c696543c0/component.json#L12

• we have a few examples of these in https://github.com/search?q=org%3Aaboutcode-org component.json&type=code