Use JavaScript Optional chaining

dev/Stores/User/App.js

@@ -21,6 +21,6 @@ AppUserStore.focusedState.subscribe(value => {
 			ThemeStore.isMobile() && leftPanelDisabled('FolderList' !== value);
 		}
 		let dom = elementById('V-Mail'+name);
-		dom && dom.classList.toggle('focused', name === value);
+		dom?.classList.toggle('focused', name === value);
 	});
 });

dev/Stores/User/Contact.js

@@ -33,12 +33,12 @@ ContactUserStore.sync = fResultFunc => {
 				line = JSON.parse(line);
 				if ('ContactsSync' === line.Action) {
 					ContactUserStore.syncing(false);
-					fResultFunc && fResultFunc(line.ErrorCode, line);
+					fResultFunc?.(line.ErrorCode, line);
 				}
 			} catch (e) {
 				ContactUserStore.syncing(false);
 				console.error(e);
-				fResultFunc && fResultFunc(Notification.UnknownError);
+				fResultFunc?.(Notification.UnknownError);
 			}
 		}, 'ContactsSync');
 	}

dev/Stores/User/Folder.js

@@ -80,15 +80,9 @@ export const FolderUserStore = new class {
 
 		const
 			subscribeRemoveSystemFolder = observable => {
-				observable.subscribe(() => {
-					const folder = getFolderFromCacheList(observable());
-					folder && folder.type(FolderType.User);
-				}, self, 'beforeChange');
+				observable.subscribe(() => getFolderFromCacheList(observable())?.type(FolderType.User), self, 'beforeChange');
 			},
-			fSetSystemFolderType = type => value => {
-				const folder = getFolderFromCacheList(value);
-				folder && folder.type(type);
-			};
+			fSetSystemFolderType = type => value => getFolderFromCacheList(value)?.type(type);
 
 		subscribeRemoveSystemFolder(self.sentFolder);
 		subscribeRemoveSystemFolder(self.draftsFolder);
@@ -134,8 +128,7 @@ export const FolderUserStore = new class {
 			fSearchFunction = (list) => {
 				list.forEach(folder => {
 					if (
-						folder &&
-						folder.selectable() &&
+						folder?.selectable() &&
 						folder.exists &&
 						timeout > folder.expires &&
 						(folder.isSystemFolder() || (folder.isSubscribed() && (folder.checkable() || !bDisplaySpecSetting)))
@@ -143,7 +136,7 @@ export const FolderUserStore = new class {
 						timeouts.push([folder.expires, folder.fullName]);
 					}
 
-					if (folder && folder.subFolders.length) {
+					if (folder?.subFolders.length) {
 						fSearchFunction(folder.subFolders());
 					}
 				});

dev/Stores/User/GnuPG.js

@@ -38,7 +38,7 @@ export const GnuPGUserStore = new class {
 		this.privateKeys([]);
 		Remote.request('GnupgGetKeys',
 			(iError, oData) => {
-				if (oData && oData.Result) {
+				if (oData?.Result) {
 					this.keyring = oData.Result;
 					const initKey = (key, isPrivate) => {
 						const aEmails = [];
@@ -73,7 +73,7 @@ export const GnuPGUserStore = new class {
 						key.view = () => {
 							const fetch = pass => Remote.request('GnupgExportKey',
 									(iError, oData) => {
-										if (oData && oData.Result) {
+										if (oData?.Result) {
 											key.armor = oData.Result;
 											showScreenPopup(OpenPgpKeyPopupView, [key]);
 										}
@@ -111,10 +111,10 @@ export const GnuPGUserStore = new class {
 	importKey(key, callback) {
 		Remote.request('GnupgImportKey',
 			(iError, oData) => {
-				if (oData && oData.Result/* && (oData.Result.imported || oData.Result.secretimported)*/) {
+				if (oData?.Result/* && (oData.Result.imported || oData.Result.secretimported)*/) {
 					this.loadKeyrings();
 				}
-				callback && callback(iError, oData);
+				callback?.(iError, oData);
 			}, {
 				Key: key
 			}
@@ -131,10 +131,10 @@ export const GnuPGUserStore = new class {
 	storeKeyPair(keyPair, callback) {
 		Remote.request('PgpStoreKeyPair',
 			(iError, oData) => {
-				if (oData && oData.Result) {
+				if (oData?.Result) {
 //					this.gnupgKeyring = oData.Result;
 				}
-				callback && callback(iError, oData);
+				callback?.(iError, oData);
 			}, keyPair
 		);
 	}
@@ -187,7 +187,7 @@ export const GnuPGUserStore = new class {
 				}
 				if (null !== params.Passphrase) {
 					const result = await Remote.post('GnupgDecrypt', null, params);
-					if (result && result.Result) {
+					if (result?.Result) {
 						return result.Result;
 					}
 				}
@@ -208,7 +208,7 @@ export const GnuPGUserStore = new class {
 				data.SigPart = data.SigPart.body;
 			}
 			let response = await Remote.post('MessagePgpVerify', null, data);
-			if (response && response.Result) {
+			if (response?.Result) {
 				return {
 					fingerprint: response.Result.fingerprint,
 					success: 0 == response.Result.status // GOODSIG

dev/Stores/User/Message.js

@@ -42,7 +42,7 @@ export const MessageUserStore = new class {
 
 	purgeMessageBodyCache() {
 		const messagesDom = this.bodiesDom(),
-			children = messagesDom && messagesDom.children;
+			children = messagesDom?.children;
 		if (children) {
 			while (15 < children.length) {
 				children[0].remove();

dev/Stores/User/Messagelist.js

@@ -270,8 +270,7 @@ MessagelistUserStore.setAction = (sFolderFullName, iSetAction, messages) => {
 
 	let folder,
 		alreadyUnread = 0,
-		rootUids = messages.map(oMessage => oMessage && oMessage.uid ? oMessage.uid : null)
-			.validUnique(),
+		rootUids = messages.map(oMessage => oMessage?.uid).validUnique(),
 		length = rootUids.length;
 
 	if (sFolderFullName && length) {
@@ -333,7 +332,7 @@ MessagelistUserStore.removeMessagesFromList = (
 				? messageList.filter(item => item && uidForRemove.includes(pInt(item.uid)))
 				: [];
 
-	messages.forEach(item => item && item.isUnseen() && ++unseenCount);
+	messages.forEach(item => item?.isUnseen() && ++unseenCount);
 
 	if (fromFolder) {
 		fromFolder.hash = '';
@@ -387,7 +386,7 @@ MessagelistUserStore.removeMessagesFromList = (
 	if (MessagelistUserStore.threadUid()) {
 		if (
 			messageList.length &&
-			messageList.find(item => item && item.deleted() && item.uid == MessagelistUserStore.threadUid())
+			messageList.find(item => item?.deleted() && item.uid == MessagelistUserStore.threadUid())
 		) {
 			const message = messageList.find(item => item && !item.deleted());
 			let setHash;

dev/Stores/User/Notification.js

@@ -6,7 +6,7 @@ import { fireEvent } from 'Common/Globals';
  * Might not work due to the new ServiceWorkerRegistration.showNotification
  */
 const HTML5Notification = window.Notification,
-	HTML5NotificationStatus = () => (HTML5Notification && HTML5Notification.permission) || 'denied',
+	HTML5NotificationStatus = () => HTML5Notification?.permission || 'denied',
 	NotificationsDenied = () => 'denied' === HTML5NotificationStatus(),
 	NotificationsGranted = () => 'granted' === HTML5NotificationStatus(),
 	dispatchMessage = data => {
@@ -26,7 +26,7 @@ if (WorkerNotifications && ServiceWorkerRegistration && ServiceWorkerRegistratio
 	/* Listen for close requests from the ServiceWorker */
 	WorkerNotifications.addEventListener('message', event => {
 		const obj = JSON.parse(event.data);
-		obj && 'notificationclick' === obj.action && dispatchMessage(obj.data);
+		'notificationclick' === obj?.action && dispatchMessage(obj.data);
 	});
 } else {
 	WorkerNotifications = null;
@@ -60,7 +60,7 @@ export const NotificationUserStore = new class {
 				icon: imageSrc || Links.staticLink('css/images/icon-message-notification.png'),
 				data: messageData
 			};
-			if (messageData && messageData.Uid) {
+			if (messageData?.Uid) {
 				options.tag = messageData.Uid;
 			}
 			if (WorkerNotifications) {
@@ -83,7 +83,7 @@ export const NotificationUserStore = new class {
 				.catch(e => console.error(e));
 			} else {
 				const notification = new HTML5Notification(title, options);
-				notification.show && notification.show();
+				notification.show?.();
 				notification.onclick = messageData ? () => dispatchMessage(messageData) : null;
 				setTimeout(() => notification.close(), 7000);
 			}

dev/Stores/User/OpenPGP.js

@@ -196,7 +196,7 @@ export const OpenPGPUserStore = new class {
 				const publicKey = findOpenPGPKey(this.publicKeys, sender/*, sign*/);
 				return await openpgp.decrypt({
 					message,
-					verificationKeys: publicKey && publicKey.key,
+					verificationKeys: publicKey?.key,
 //					expectSigned: true,
 //					signature: '', // Detached signature
 					decryptionKeys: decryptedKey

dev/Stores/User/Pgp.js

@@ -169,7 +169,7 @@ export const
 						}
 					);
 					if (result) {
-						if (result.error && result.error.message) {
+						if (result.error?.message) {
 							if ('PWD_DIALOG_CANCEL' !== result.error.code) {
 								alert(result.error.code + ': ' + result.error.message);
 							}