feat: give these objects a name

It's much less friendly to use this library (and those that depend on
it, like npm-package-arg) when it's not clear whether the returned value
is a member of a class (which likely has some useful methods) or just an
object full of data that the user is expected to know what to do with.

This is especially vexing since some of this sort of data is saved to
various lock and config files, so _sometimes_ a thing that looks
suspiciously like a GitHost object actually is just a plain old JS
object.

git-host.js

@@ -17,7 +17,8 @@ var extend = Object.assign || function _extend (target, source) {
   return target
 }
 
-var GitHost = module.exports = function (type, user, auth, project, committish, defaultRepresentation, opts) {
+module.exports = GitHost
+function GitHost (type, user, auth, project, committish, defaultRepresentation, opts) {
   var gitHostInfo = this
   gitHostInfo.type = type
   Object.keys(gitHosts[type]).forEach(function (key) {
@@ -30,7 +31,6 @@ var GitHost = module.exports = function (type, user, auth, project, committish,
   gitHostInfo.default = defaultRepresentation
   gitHostInfo.opts = opts || {}
 }
-GitHost.prototype = {}
 
 GitHost.prototype.hash = function () {
   return this.committish ? '#' + this.committish : ''

test/basic.js

@@ -3,6 +3,9 @@ var HostedGit = require('../index')
 var test = require('tap').test
 
 test('basic', function (t) {
+  const h = HostedGit.fromUrl('github:user/project')
+  t.is(h.constructor, HostedGit)
+  t.is(h.constructor.name, 'GitHost')
   t.is(HostedGit.fromUrl('https://google.com'), undefined, 'null on failure')
   t.is(HostedGit.fromUrl('https://github.com/abc/def').getDefaultRepresentation(), 'https', 'match https urls')
   t.is(HostedGit.fromUrl('https://github.com/abc/def/').getDefaultRepresentation(), 'https', 'match URLs with a trailing slash')