fix: don't crash on safari<16 (#1383)

* fix: don't crash on safari<16

* fix: apply PR Pre-launch Checklist

Author: holzgeist

permission_handler_html/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.3+3
+
+- Safari < 16 compatibility: Don't crash on missing `window.navigator.permissions` property
+
 ## 0.1.3+2
 
 - `web: 1.0.0` compatibility: `PermissionDescriptor` was removed in web package.

permission_handler_html/lib/permission_handler_html.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:js_interop_unsafe';
 
 import 'package:web/web.dart' as web;
 
@@ -12,8 +13,15 @@ import 'web_delegate.dart';
 class WebPermissionHandler extends PermissionHandlerPlatform {
   static final web.MediaDevices _devices = web.window.navigator.mediaDevices;
   static final web.Geolocation _geolocation = web.window.navigator.geolocation;
-  static final web.Permissions _htmlPermissions =
-      web.window.navigator.permissions;
+  static final web.Permissions? _htmlPermissions = (() {
+    // Using unsafe interop to check availability of `permissions`.
+    // It's not defined as nullable, so merely loading it into a web.Permission? variable
+    // causes the null-check to fail
+    if (!web.window.navigator.has("permissions")) {
+      return null;
+    }
+    return web.window.navigator.permissions;
+  })();
 
   final WebDelegate _webDelegate;
 

permission_handler_html/pubspec.yaml

@@ -1,6 +1,6 @@
 name: permission_handler_html
 description: Permission plugin for Flutter. This plugin provides the web API to request and check permissions.
-version: 0.1.3+2
+version: 0.1.3+3
 
 homepage: https://github.com/baseflow/flutter-permission-handler