internal runtime messages in safari

src/background/main.background.ts

@@ -273,6 +273,14 @@ export default class MainBackground {
         }
     }
 
+    sendInternalRuntimeMessage(message: any) {
+        if (!this.isSafari) {
+            throw new Error('Only safari can send internal runtime messages.');
+        }
+
+        this.runtimeBackground.processMessage(message, { tab: null }, () => { /* No response needed. */ });
+    }
+
     private async buildContextMenu() {
         if (this.isSafari || !chrome.contextMenus || this.buildingContextMenu) {
             return;

src/background/runtime.background.ts

@@ -68,7 +68,7 @@ export default class RuntimeBackground {
         });
     }
 
-    private async processMessage(msg: any, sender: any, sendResponse: any) {
+    async processMessage(msg: any, sender: any, sendResponse: any) {
         switch (msg.command) {
             case 'loggedIn':
             case 'unlocked':

src/services/browserMessaging.service.ts

@@ -1,3 +1,5 @@
+import { BrowserApi } from '../browser/browserApi';
+
 import {
     MessagingService,
     PlatformUtilsService,
@@ -8,10 +10,12 @@ export default class BrowserMessagingService implements MessagingService {
     }
 
     send(subscriber: string, arg: any = {}) {
-        if (this.platformUtilsService.isSafari()) {
-            // send message
-        } else {
         const message = Object.assign({}, { command: subscriber }, arg);
+
+        if (this.platformUtilsService.isSafari()) {
+            const bgPage = BrowserApi.getBackgroundPage();
+            bgPage.bitwardenMain.sendInternalRuntimeMessage(message);
+        } else {
             chrome.runtime.sendMessage(message);
         }
     }