Use peer dependencies in package.json

[robations]

When using npm as an install mechanism it would be useful to use the peerDependencies key to constrain the installed versions.

For example, the angular-animate module should only be used with the corresponding Angular core version, at the moment it is easy to upgrade angular one minor version without upgrading angular-animate. If angular-animate@1.4.x specified angular@1.4.x as a peer dependency this confusion wouldn't be possible (as far as I understand npm’s resolution logic).

[wesleycho]

It should be noted that the peer dependencies do not have an effect on constraining dependencies with npm 3.

[robations]

@wesleycho Thanks, wasn't aware of that. As far as I can tell from this issue the current behaviour is to spit out a warning if a peer dependency constraint isn't satisfied.

[groupsky]

I just spent 3 hours debugging build issue due to mismatched versions of angular-mocks and angular. If there was at least a peerDependencies to warn for different version it would be much more helpful. I'm using the browserify with npm.