feat: watchState and watchLoggedIn

#52

README.md

@@ -131,6 +131,9 @@ Working with low level state: (Not recommended)
 this.$auth.setState(key, val)
 this.$auth.getState(key)
 
+// Watch state changes
+this.$auth.watchState('loggedIn', newValue => { })
+
 // Cookie
 this.$auth.setCookie(key, val, options)
 this.$auth.getCookie(key)
@@ -257,6 +260,12 @@ If enabled, user will be automatically logged out if any error happens. (For exa
 
 If enabled, user will redirect back to the original guarded route instead of `redirects.home`.
 
+### `watchLoggedIn`
+
+* Default: `true`
+
+If enabled, user will automatically redirected to `redirects.home` after login/logout.
+
 ### `namespace`
 
 * Default: `auth`

lib/defaults.js

@@ -2,6 +2,7 @@ module.exports = {
   fetchUserOnLogin: true,
   resetOnError: true,
   rewriteRedirects: true,
+  watchLoggedIn: true,
   namespace: 'auth',
   scopeKey: 'scope',
   endpoints: {

lib/templates/auth.class.js

@@ -22,6 +22,11 @@ export default class Auth {
       this._resetOnError()
     }
 
+    // Watch for loggedIn changes only in client side
+    if (this.options.watchLoggedIn && process.browser) {
+      this._watchLoggedIn()
+    }
+
     this._registerVuexStore()
   }
 
@@ -50,15 +55,13 @@ export default class Auth {
     })
   }
 
-  watchLoggedIn () {
+  _watchLoggedIn () {
     this._loggedInWatcher =
       this._loggedInWatcher ||
-      this.$store.watch(
-        state => state[this.options.namespace]['loggedIn'],
-        () => {
-          this.redirect('home')
-        }
-      )
+      this.watchState('loggedIn', () => {
+        $auth.redirect('home')
+      })
+
     return this._loggedInWatcher
   }
 
@@ -138,6 +141,13 @@ export default class Auth {
     return this.state[key]
   }
 
+  watchState (key, fn) {
+    return this.$store.watch(
+      state => getProp(state[this.options.namespace], key),
+      fn
+    )
+  }
+
   setLocalStorage (name, value) {
     if (typeof localStorage !== 'undefined') {
       if (value) {

lib/templates/auth.plugin.js

@@ -17,11 +17,6 @@ export default function (ctx, inject) {
   // Sync token
   $auth.syncToken()
 
-  // Watch for loggedIn changes only in client side
-  if (process.browser) {
-    $auth.watchLoggedIn()
-  }
-
   // Fetch user if is not available
   if (!$auth.state.user) {
     return $auth.fetchUser()