Be defensive about unmounting uiRouter. Resolves #59.

.prettierignore

@@ -2,4 +2,6 @@
 .prettierignore
 LICENSE
 yarn.lock
-.npmignore
+.npmignore
+lib
+pnpm-lock.yaml

package.json

@@ -4,7 +4,7 @@
   "description": "the logic needed to register angular 1 apps with single-spa",
   "main": "lib/single-spa-angularjs.js",
   "scripts": {
-    "format": "prettier './**/*' --write",
+    "format": "prettier . --write",
     "build": "rimraf lib && babel src --out-dir lib --source-maps",
     "prepublishOnly": "yarn build"
   },

src/single-spa-angularjs.js

@@ -103,10 +103,16 @@ function mount(opts, mountedInstances, props = {}) {
 
 function unmount(opts, mountedInstances, props = {}) {
   return new Promise((resolve, reject) => {
-    // https://github.com/single-spa/single-spa-angularjs/issues/53
-    const uiRouter = mountedInstances.instance.get("$uiRouter");
-    if (uiRouter) {
-      uiRouter.dispose();
+    if (mountedInstances.instance.has("$uiRouter")) {
+      // https://github.com/single-spa/single-spa-angularjs/issues/53
+      const uiRouter = mountedInstances.instance.get("$uiRouter");
+      if (uiRouter.dispose) {
+        uiRouter.dispose();
+      } else {
+        console.warn(
+          "single-spa-angularjs: the uiRouter instance doesn't have a dispose method and so it will not be properly unmounted."
+        );
+      }
     }
 
     mountedInstances.instance.get("$rootScope").$destroy();