function onDeps( error ) {
		if ( error ) {
			debug( 'Encountered an error when resolving package dependencies: %s', error.message );
			return done( error );
		}
		debug( 'Successfully resolved package dependencies.' );
		if ( opts.dev === false ) {
			return done();
		}
		debug( 'Resolving package dev dependencies...' );
		resolveDevDeps( results, opts, onDevDeps );
	}
Callback invoked upon resolving package dependencies.

@private
@param {(Error|null)} error - error object
@param {ObjectArray} results - results
@returns {void}