JavaScript string compare '' is always a ToBoolean

See https://www.ecma-international.org/ecma-262/5.1/#sec-9.2

README.md

@@ -61,23 +61,23 @@ Things might work in Edge 15-18, Firefox 47-62 and Chrome 54-68 due to one polyf
 
 |js/*       	|1.14.0   	|native   	|
 |-----------	|--------:	|--------:	|
-|admin.js    	|2.130.942	|1.359.501	|
+|admin.js    	|2.130.942	|1.356.246	|
-|app.js      	|4.184.455	|3.121.743	|
+|app.js      	|4.184.455	|3.117.728	|
 |boot.js     	|  671.522	|  109.651	|
 |libs.js     	|  647.614	|  508.324	|
 |polyfills.js	|  325.834	|        0	|
-|TOTAL js   	|7.960.367	|5.097.142	|
+|TOTAL js   	|7.960.367	|5.091.949	|
 
 |js/min/*       	|1.14.0   	|native   	|
-|-----------	|--------:	|--------:	|
+|---------------	|--------:	|--------:	|
-|admin.js    	|  252.147	|  177.094	|
+|admin.min.js    	|  252.147	|  176.702	|
-|app.js      	|  511.202	|  409.173	|
+|app.min.js      	|  511.202	|  408.359	|
-|boot.js     	|   66.007	|   13.380	|
+|boot.min.js     	|   66.007	|   13.380	|
-|libs.js     	|  572.545	|  465.247	|
+|libs.min.js     	|  572.545	|  465.247	|
-|polyfills.js	|   32.452	|        0	|
+|polyfills.min.js	|   32.452	|        0	|
-|TOTAL js/min	|1.434.353	|1.064.753	|
+|TOTAL js/min   	|1.434.353	|1.063.688	|
 
-369.600 bytes is not much, but it feels faster.
+370.665 bytes is not much, but it feels faster.
 
 ### PHP73 branch
 

dev/App/User.js

@@ -581,9 +581,7 @@ class AppUser extends AbstractApp {
 			if (StorageResultType.Success === sResult && oData.Result) {
 				const counts = {},
 					sAccountEmail = AccountStore.email();
-				let parentEmail = Settings.settingsGet('ParentEmail');
+				let parentEmail = Settings.settingsGet('ParentEmail') || sAccountEmail;
-
-				parentEmail = '' === parentEmail ? sAccountEmail : parentEmail;
 
 				if (isArray(oData.Result.Accounts)) {
 					AccountStore.accounts().forEach(oAccount => {
@@ -667,7 +665,7 @@ class AppUser extends AbstractApp {
 	 * @param {Array=} list = []
 	 */
 	folderInformation(folder, list) {
-		if ('' !== trim(folder)) {
+		if (trim(folder)) {
 			Remote.folderInformation(
 				(result, data) => {
 					if (StorageResultType.Success === result) {
@@ -727,7 +725,7 @@ class AppUser extends AbstractApp {
 								);
 
 								const hash = getFolderHash(data.Result.Folder);
-								if (data.Result.Hash !== hash || '' === hash || unreadCountChange) {
+								if (!hash || unreadCountChange || data.Result.Hash !== hash) {
 									if (folderFromCache.fullNameRaw === FolderStore.currentFolderFullNameRaw()) {
 										this.reloadMessageList();
 									} else if (getFolderInboxName() === folderFromCache.fullNameRaw) {
@@ -782,7 +780,7 @@ class AppUser extends AbstractApp {
 									clearMessageFlagsFromCacheByFolder(folder.fullNameRaw);
 								}
 
-								if (item.Hash !== hash || '' === hash) {
+								if (!hash || item.Hash !== hash) {
 									if (folder.fullNameRaw === FolderStore.currentFolderFullNameRaw()) {
 										this.reloadMessageList();
 									}
@@ -823,7 +821,7 @@ class AppUser extends AbstractApp {
 		rootUids = messages.map(oMessage => oMessage && oMessage.uid ? oMessage.uid : null)
 			.filter((value, index, self) => !!value && self.indexOf(value) == index);
 
-		if ('' !== sFolderFullNameRaw && rootUids.length) {
+		if (sFolderFullNameRaw && rootUids.length) {
 			switch (iSetAction) {
 				case MessageSetAction.SetSeen:
 					rootUids.forEach(sSubUid => {
@@ -1083,7 +1081,7 @@ class AppUser extends AbstractApp {
 					this.bootend();
 
 					if (value) {
-						if ('' !== startupUrl) {
+						if (startupUrl) {
 							routeOff();
 							setHash(root(startupUrl), true);
 							routeOn();

dev/Common/Audio.js

@@ -19,9 +19,9 @@ class Audio {
 
 		this.supported = !bMobileDevice && !bSafari && !!this.player && !!this.player.play;
 		if (this.supported && this.player && this.player.canPlayType) {
-			this.supportedMp3 = '' !== this.player.canPlayType('audio/mpeg;').replace(/no/, '');
+			this.supportedMp3 = !!this.player.canPlayType('audio/mpeg;').replace(/no/, '');
-			this.supportedWav = '' !== this.player.canPlayType('audio/wav; codecs="1"').replace(/no/, '');
+			this.supportedWav = !!this.player.canPlayType('audio/wav; codecs="1"').replace(/no/, '');
-			this.supportedOgg = '' !== this.player.canPlayType('audio/ogg; codecs="vorbis"').replace(/no/, '');
+			this.supportedOgg = !!this.player.canPlayType('audio/ogg; codecs="vorbis"').replace(/no/, '');
 			this.supportedNotification = this.supported && this.supportedMp3;
 		}
 
@@ -81,7 +81,7 @@ class Audio {
 			name = trim(name.substr(0, name.length - 4));
 		}
 
-		return '' === name ? 'audio' : name;
+		return name || 'audio';
 	}
 
 	playMp3(url, name) {

dev/Common/Cache.js

@@ -89,7 +89,7 @@ export function clearNewMessageCache() {
  * @returns {string}
  */
 export function getFolderInboxName() {
-	return '' === inboxFolderName ? 'INBOX' : inboxFolderName;
+	return inboxFolderName || 'INBOX';
 }
 
 /**
@@ -97,7 +97,7 @@ export function getFolderInboxName() {
  * @returns {string}
  */
 export function getFolderFullNameRaw(folderHash) {
-	return '' !== folderHash && FOLDERS_NAME_CACHE[folderHash] ? FOLDERS_NAME_CACHE[folderHash] : '';
+	return folderHash && FOLDERS_NAME_CACHE[folderHash] ? FOLDERS_NAME_CACHE[folderHash] : '';
 }
 
 /**
@@ -106,7 +106,7 @@ export function getFolderFullNameRaw(folderHash) {
  */
 export function setFolderFullNameRaw(folderHash, folderFullNameRaw) {
 	FOLDERS_NAME_CACHE[folderHash] = folderFullNameRaw;
-	if ('INBOX' === folderFullNameRaw || '' === inboxFolderName) {
+	if (!inboxFolderName || 'INBOX' === folderFullNameRaw) {
 		inboxFolderName = folderFullNameRaw;
 	}
 }
@@ -116,7 +116,7 @@ export function setFolderFullNameRaw(folderHash, folderFullNameRaw) {
  * @returns {string}
  */
 export function getFolderHash(folderFullNameRaw) {
-	return '' !== folderFullNameRaw && FOLDERS_HASH_CACHE[folderFullNameRaw] ? FOLDERS_HASH_CACHE[folderFullNameRaw] : '';
+	return folderFullNameRaw && FOLDERS_HASH_CACHE[folderFullNameRaw] ? FOLDERS_HASH_CACHE[folderFullNameRaw] : '';
 }
 
 /**
@@ -124,7 +124,7 @@ export function getFolderHash(folderFullNameRaw) {
  * @param {string} folderHash
  */
 export function setFolderHash(folderFullNameRaw, folderHash) {
-	if ('' !== folderFullNameRaw) {
+	if (folderFullNameRaw) {
 		FOLDERS_HASH_CACHE[folderFullNameRaw] = folderHash;
 	}
 }
@@ -134,7 +134,7 @@ export function setFolderHash(folderFullNameRaw, folderHash) {
  * @returns {string}
  */
 export function getFolderUidNext(folderFullNameRaw) {
-	return '' !== folderFullNameRaw && FOLDERS_UID_NEXT_CACHE[folderFullNameRaw]
+	return folderFullNameRaw && FOLDERS_UID_NEXT_CACHE[folderFullNameRaw]
 		? FOLDERS_UID_NEXT_CACHE[folderFullNameRaw]
 		: '';
 }
@@ -152,7 +152,7 @@ export function setFolderUidNext(folderFullNameRaw, uidNext) {
  * @returns {?FolderModel}
  */
 export function getFolderFromCacheList(folderFullNameRaw) {
-	return '' !== folderFullNameRaw && FOLDERS_CACHE[folderFullNameRaw] ? FOLDERS_CACHE[folderFullNameRaw] : null;
+	return folderFullNameRaw && FOLDERS_CACHE[folderFullNameRaw] ? FOLDERS_CACHE[folderFullNameRaw] : null;
 }
 
 /**

dev/Common/Links.js

@@ -371,7 +371,7 @@ export function mailBox(folder, page = 1, search = '', threadUid = '') {
 
 	let result = HASH_PREFIX + 'mailbox/';
 
-	if ('' !== folder) {
+	if (folder) {
 		const resultThreadUid = pInt(threadUid);
 		result += window.encodeURI(folder) + (0 < resultThreadUid ? '~' + resultThreadUid : '');
 	}
@@ -381,7 +381,7 @@ export function mailBox(folder, page = 1, search = '', threadUid = '') {
 		result += '/p' + page;
 	}
 
-	if ('' !== search) {
+	if (search) {
 		result = result.replace(/[/]+$/, '');
 		result += '/' + window.encodeURI(search);
 	}

dev/Common/Selector.js

@@ -561,7 +561,7 @@ class Selector {
 
 		const uid = this.getItemUid(item);
 		if (event && event.shiftKey) {
-			if ('' !== uid && '' !== this.sLastUid && uid !== this.sLastUid) {
+			if (uid && this.sLastUid && uid !== this.sLastUid) {
 				list = this.list();
 				checked = item.checked();
 
@@ -585,7 +585,7 @@ class Selector {
 			}
 		}
 
-		this.sLastUid = '' === uid ? '' : uid;
+		this.sLastUid = uid || '';
 	}
 
 	/**
@@ -598,7 +598,7 @@ class Selector {
 			if (event) {
 				if (event.shiftKey && !(event.ctrlKey || event.metaKey) && !event.altKey) {
 					click = false;
-					if ('' === this.sLastUid) {
+					if (!this.sLastUid) {
 						this.sLastUid = this.getItemUid(item);
 					}
 

dev/Common/Utils.js

@@ -68,7 +68,7 @@ export function isPosNumeric(value, includeZero = true) {
  * @returns {number}
  */
 export function pInt(value, defaultValur = 0) {
-	const result = isNormal(value) && '' !== value ? window.parseInt(value, 10) : defaultValur;
+	const result = isNormal(value) && value ? window.parseInt(value, 10) : defaultValur;
 	return window.isNaN(result) ? defaultValur : result;
 }
 
@@ -309,7 +309,7 @@ export function replySubjectAdd(prefix, subject) {
 	const parts = [],
 		prefixIsRe = !fwd;
 
-	if ('' !== subject) {
+	if (subject) {
 		subject.split(':').forEach(part => {
 			const trimmedPart = trim(part);
 			if (!drop && (/^(RE|FWD)$/i.test(trimmedPart) || /^(RE|FWD)[[(][\d]+[\])]$/i.test(trimmedPart))) {
@@ -814,7 +814,7 @@ export function plainToHtml(plain, findEmailAndLinksInText = false) {
 				aNextText.push('~~~blockquote~~~');
 				aNextText.push(sLine.substr(1));
 			} else if (!bStart && bIn) {
-				if ('' !== sLine) {
+				if (sLine) {
 					bIn = false;
 					aNextText.push('~~~/blockquote~~~');
 					aNextText.push(sLine);
@@ -1191,9 +1191,9 @@ export function computedPagenatorHelper(koCurrentPage, koPageCount) {
 			fAdd = (index, push = true, customName = '') => {
 				const data = {
 					current: index === currentPage,
-					name: '' === customName ? index.toString() : customName.toString(),
+					name: customName ? customName.toString() : index.toString(),
-					custom: '' !== customName,
+					custom: !!customName,
-					title: '' === customName ? '' : index.toString(),
+					title: customName ? index.toString() : '',
 					value: index.toString()
 				};
 

dev/External/ko.js

@@ -160,12 +160,12 @@ ko.bindingHandlers.tooltip = {
 				}
 			});
 
-			if ('' === sValue) {
+			if (sValue) {
+				element.__opentip.activate();
+			} else {
 				element.__opentip.hide();
 				element.__opentip.deactivate();
 				element.__opentip.setContent('');
-			} else {
-				element.__opentip.activate();
 			}
 
 			if (isI18N) {
@@ -245,11 +245,7 @@ ko.bindingHandlers.tooltipErrorTip = {
 			openTips = element.__opentip;
 
 		if (openTips) {
-			if ('' === value) {
+			if (value) {
-				openTips.hide();
-				openTips.deactivate();
-				openTips.setContent('');
-			} else {
 				setTimeout(() => {
 					if ($el.is(':visible')) {
 						openTips.setContent(value);
@@ -261,6 +257,10 @@ ko.bindingHandlers.tooltipErrorTip = {
 						openTips.setContent('');
 					}
 				}, Magics.Time100ms);
+			} else {
+				openTips.hide();
+				openTips.deactivate();
+				openTips.setContent('');
 			}
 		}
 	}
@@ -1087,7 +1087,7 @@ ko.observable.fn.validateEmail = function() {
 	this.hasError = ko.observable(false);
 
 	this.subscribe((value) => {
-		this.hasError('' !== value && !/^[^@\s]+@[^@\s]+$/.test(value));
+		this.hasError(value && !/^[^@\s]+@[^@\s]+$/.test(value));
 	});
 
 	this.valueHasMutated();
@@ -1098,7 +1098,7 @@ ko.observable.fn.validateSimpleEmail = function() {
 	this.hasError = ko.observable(false);
 
 	this.subscribe((value) => {
-		this.hasError('' !== value && !/^.+@.+$/.test(value));
+		this.hasError(value && !/^.+@.+$/.test(value));
 	});
 
 	this.valueHasMutated();

dev/Helper/Message.js

@@ -24,7 +24,7 @@ export function emailArrayToStringClear(emails) {
 	const result = [];
 	if (isNonEmptyArray(emails)) {
 		emails.forEach(email => {
-			if (email && email.email && '' !== email.name) {
+			if (email && email.email && email.name) {
 				result.push(email.email);
 			}
 		});

dev/Knoin/Knoin.js

@@ -95,7 +95,7 @@ export function routeOn() {
  * @returns {?Object}
  */
 export function screen(screenName) {
-	return '' !== screenName && !isUnd(SCREENS[screenName]) ? SCREENS[screenName] : null;
+	return screenName && !isUnd(SCREENS[screenName]) ? SCREENS[screenName] : null;
 }
 
 /**
@@ -288,11 +288,11 @@ export function screenOnRoute(screenName, subPart) {
 		isSameScreen = false,
 		cross = null;
 
-	if ('' === pString(screenName)) {
+	if (!pString(screenName)) {
 		screenName = defaultScreenName;
 	}
 
-	if ('' !== screenName) {
+	if (screenName) {
 		vmScreen = screen(screenName);
 		if (!vmScreen) {
 			vmScreen = screen(defaultScreenName);
@@ -404,8 +404,8 @@ export function startScreens(screensClasses) {
 			const vmScreen = new CScreen(),
 				screenName = vmScreen ? vmScreen.screenName() : '';
 
-			if (vmScreen && '' !== screenName) {
+			if (vmScreen && screenName) {
-				if ('' === defaultScreenName) {
+				if (!defaultScreenName) {
 					defaultScreenName = screenName;
 				}
 

dev/Model/Attachment.js

@@ -361,7 +361,7 @@ class AttachmentModel extends AbstractModel {
 	 */
 	linkThumbnailPreviewStyle() {
 		const link = this.linkThumbnail();
-		return '' === link ? '' : 'background:url(' + link + ')';
+		return link ? 'background:url(' + link + ')' : '';
 	}
 
 	/**

dev/Model/ComposeAttachment.js

@@ -46,8 +46,7 @@ class ComposeAttachmentModel extends AbstractModel {
 		});
 
 		this.title = ko.computed(() => {
-			const error = this.error();
+			return this.error() || this.fileName();
-			return '' !== error ? error : this.fileName();
 		});
 
 		this.friendlySize = ko.computed(() => {

dev/Model/Contact.js

@@ -35,14 +35,14 @@ class ContactModel extends AbstractModel {
 						name = trim(property[1] + ' ' + name);
 					} else if (ContactPropertyType.LastName === property[0]) {
 						name = trim(name + ' ' + property[1]);
-					} else if ('' === email && ContactPropertyType.Email === property[0]) {
+					} else if (!email && ContactPropertyType.Email === property[0]) {
 						email = property[1];
 					}
 				}
 			});
 		}
 
-		return '' === email ? null : [email, name];
+		return email ? [email, name] : null;
 	}
 
 	/**

dev/Model/Email.js

@@ -47,7 +47,7 @@ class EmailModel {
 	 * @returns {boolean}
 	 */
 	validate() {
-		return '' !== this.name || '' !== this.email;
+		return this.name || this.email;
 	}
 
 	/**
@@ -87,7 +87,7 @@ class EmailModel {
 			this.dkimStatus = trim(json.DkimStatus || '');
 			this.dkimValue = trim(json.DkimValue || '');
 
-			result = '' !== this.email;
+			result = !!this.email;
 			this.clearDuplicateName();
 		}
 
@@ -102,8 +102,8 @@ class EmailModel {
 	 */
 	toLine(friendlyView, wrapWithLink = false, useEncodeHtml = false) {
 		let result = '';
-		if ('' !== this.email) {
+		if (this.email) {
-			if (friendlyView && '' !== this.name) {
+			if (friendlyView && this.name) {
 				result = wrapWithLink
 					? '<a href="mailto:' +
 					  encodeHtml(this.email) +
@@ -119,7 +119,7 @@ class EmailModel {
 				// 	'" target="_blank" tabindex="-1">' + encodeHtml(this.name) + '</a>' : (useEncodeHtml ? encodeHtml(this.name) : this.name);
 			} else {
 				result = this.email;
-				if ('' !== this.name) {
+				if (this.name) {
 					if (wrapWithLink) {
 						result =
 							encodeHtml('"' + this.name + '" <') +
@@ -197,7 +197,7 @@ class EmailModel {
 	 */
 	parse(emailAddress) {
 		emailAddress = trim(emailAddress);
-		if ('' === emailAddress) {
+		if (!emailAddress) {
 			return false;
 		}
 

dev/Model/Filter.js

@@ -118,13 +118,13 @@ class FilterModel extends AbstractModel {
 
 		this.regDisposables(
 			this.name.subscribe((sValue) => {
-				this.name.error('' === sValue);
+				this.name.error(!sValue);
 			})
 		);
 
 		this.regDisposables(
 			this.actionValue.subscribe((sValue) => {
-				this.actionValue.error('' === sValue);
+				this.actionValue.error(!sValue);
 			})
 		);
 
@@ -139,7 +139,7 @@ class FilterModel extends AbstractModel {
 	}
 
 	verify() {
-		if ('' === this.name()) {
+		if (!this.name()) {
 			this.name.error(true);
 			return false;
 		}
@@ -150,7 +150,7 @@ class FilterModel extends AbstractModel {
 			}
 		}
 
-		if ('' === this.actionValue()) {
+		if (!this.actionValue()) {
 			if ([
 					FiltersAction.MoveTo,
 					FiltersAction.Forward,
@@ -170,7 +170,7 @@ class FilterModel extends AbstractModel {
 
 		if (
 			FiltersAction.Vacation === this.actionType() &&
-			'' !== this.actionValueFourth() &&
+			this.actionValueFourth() &&
 			!this.actionValueFourth().includes('@')
 		) {
 			this.actionValueFourth.error(true);

dev/Model/FilterCondition.js

@@ -43,12 +43,12 @@ class FilterConditionModel extends AbstractModel {
 	}
 
 	verify() {
-		if ('' === this.value()) {
+		if (!this.value()) {
 			this.value.error(true);
 			return false;
 		}
 
-		if (FilterConditionField.Header === this.field() && '' === this.valueSecond()) {
+		if (FilterConditionField.Header === this.field() && !this.valueSecond()) {
 			this.valueSecond.error(true);
 			return false;
 		}

dev/Model/Folder.js

@@ -210,7 +210,7 @@ class FolderModel extends AbstractModel {
 				}
 			}
 
-			if (('' !== suffix && '(' + name + ')' === suffix) || '(inbox)' === suffix.toLowerCase()) {
+			if ((suffix && '(' + name + ')' === suffix) || '(inbox)' === suffix.toLowerCase()) {
 				suffix = '';
 			}
 
@@ -224,7 +224,7 @@ class FolderModel extends AbstractModel {
 			}
 		});
 
-		this.hasUnreadMessages = ko.computed(() => 0 < this.messageCountUnread() && '' !== this.printableUnreadCount());
+		this.hasUnreadMessages = ko.computed(() => 0 < this.messageCountUnread() && this.printableUnreadCount());
 
 		this.hasSubScribedUnreadMessagesSubfolders = ko.computed(
 			() =>

dev/Model/Identity.js

@@ -21,7 +21,7 @@ class IdentityModel extends AbstractModel {
 		this.signatureInsertBefore = ko.observable(false);
 
 		this.deleteAccess = ko.observable(false);
-		this.canBeDeleted = ko.computed(() => '' !== this.id());
+		this.canBeDeleted = ko.computed(() => !!this.id());
 	}
 
 	/**
@@ -31,7 +31,7 @@ class IdentityModel extends AbstractModel {
 		const name = this.name(),
 			email = this.email();
 
-		return '' !== name ? name + ' (' + email + ')' : email;
+		return name ? name + ' (' + email + ')' : email;
 	}
 }
 

dev/Model/Message.js

@@ -353,7 +353,7 @@ class MessageModel extends AbstractModel {
 				attachment = AttachmentModel.newInstanceFromJson(json['@Collection'][index]);
 				if (attachment) {
 					if (
-						'' !== attachment.cidWithOutTags &&
+						attachment.cidWithOutTags &&
 						this.foundedCIDs.includes(attachment.cidWithOutTags)
 					) {
 						attachment.isLinked = true;
@@ -475,7 +475,7 @@ class MessageModel extends AbstractModel {
 			'important': this.isImportant(),
 			'withAttachments': this.hasAttachments(),
 			'new': this.newForAnimation(),
-			'emptySubject': '' === this.subject(),
+			'emptySubject': !this.subject(),
 			// 'hasChildrenMessage': 1 < this.threadsLen(),
 			'hasUnseenSubMessage': this.hasUnseenSubMessage(),
 			'hasFlaggedSubMessage': this.hasFlaggedSubMessage()
@@ -783,7 +783,7 @@ class MessageModel extends AbstractModel {
 			$('[' + attr + ']', this.body).each(function() {
 				const $this = $(this); // eslint-disable-line no-invalid-this
 				let style = trim($this.attr('style'));
-				style = '' === style ? '' : ';' === style.substr(-1) ? style + ' ' : style + '; ';
+				style = style ? (';' === style.substr(-1) ? style + ' ' : style + '; ') : '';
 				$this.attr('style', style + $this.attr(attr));
 			});
 
@@ -840,9 +840,9 @@ class MessageModel extends AbstractModel {
 
 				if (attachment && attachment.linkPreview) {
 					name = $this.attr('data-x-style-cid-name');
-					if ('' !== name) {
+					if (name) {
 						style = trim($this.attr('style'));
-						style = '' === style ? '' : ';' === style.substr(-1) ? style + ' ' : style + '; ';
+						style = style ? (';' === style.substr(-1) ? style + ' ' : style + '; ') : '';
 						$this.attr('style', style + name + ": url('" + attachment.linkPreview() + "')");
 					}
 				}

dev/Promises/User/Populator.js

@@ -29,7 +29,7 @@ class PromisesUserPopulator extends AbstractBasicPromises {
 	 * @returns {string}
 	 */
 	normalizeFolder(sFolderFullNameRaw) {
-		return '' === sFolderFullNameRaw ||
+		return !sFolderFullNameRaw ||
 			UNUSED_OPTION_VALUE === sFolderFullNameRaw ||
 			null !== Cache.getFolderFromCacheList(sFolderFullNameRaw)
 			? sFolderFullNameRaw
@@ -144,14 +144,13 @@ class PromisesUserPopulator extends AbstractBasicPromises {
 
 			if (
 				oData.SystemFolders &&
-				'' ===
+					!('' +
-					'' +
 						Settings.settingsGet('SentFolder') +
 						Settings.settingsGet('DraftFolder') +
 						Settings.settingsGet('SpamFolder') +
 						Settings.settingsGet('TrashFolder') +
 						Settings.settingsGet('ArchiveFolder') +
-						Settings.settingsGet('NullFolder')
+						Settings.settingsGet('NullFolder'))
 			) {
 				Settings.settingsSet('SentFolder', oData.SystemFolders[ServerFolderType.SENT] || null);
 				Settings.settingsSet('DraftFolder', oData.SystemFolders[ServerFolderType.DRAFTS] || null);

dev/Remote/AbstractAjax.js

@@ -134,7 +134,7 @@ if (err) {
 	 */
 	ajaxRequest(fResultCallback, params, iTimeOut = 20000, sGetAdd = '', abortActions = []) {
 		params = params || {};
-		const isPost = '' === sGetAdd,
+		const isPost = !sGetAdd,
 			start = new window.Date().getTime(),
 			action = params.Action || '';
 

dev/Remote/User/Ajax.js

@@ -313,12 +313,12 @@ class RemoteUserAjax extends AbstractAjaxRemote {
 			useThreads = AppStore.threadsAllowed() && SettingsStore.useThreads(),
 			inboxUidNext = getFolderInboxName() === sFolderFullNameRaw ? getFolderUidNext(sFolderFullNameRaw) : '';
 
-		if ('' !== folderHash && ('' === sSearch || !sSearch.includes('is:'))) {
+		if (folderHash && (!sSearch || !sSearch.includes('is:'))) {
 			return this.defaultRequest(
 				fCallback,
 				'MessageList',
 				{},
-				'' === sSearch ? DEFAULT_AJAX_TIMEOUT : SEARCH_AJAX_TIMEOUT,
+				sSearch ? SEARCH_AJAX_TIMEOUT : DEFAULT_AJAX_TIMEOUT,
 				'MessageList/' +
 					subQueryPrefix() +
 					'/' +
@@ -351,7 +351,7 @@ class RemoteUserAjax extends AbstractAjaxRemote {
 				UseThreads: useThreads ? '1' : '0',
 				ThreadUid: useThreads ? sThreadUid : ''
 			},
-			'' === sSearch ? DEFAULT_AJAX_TIMEOUT : SEARCH_AJAX_TIMEOUT,
+			sSearch ? SEARCH_AJAX_TIMEOUT : DEFAULT_AJAX_TIMEOUT,
 			'',
 			bSilent ? [] : ['MessageList']
 		);

dev/Screen/User/MailBox.js

@@ -48,10 +48,10 @@ class MailBoxUserScreen extends AbstractScreen {
 		}
 
 		getApp().setWindowTitle(
-			('' === email
+			(email
-				? ''
+				? '' + (0 < foldersInboxUnreadCount ? '(' + foldersInboxUnreadCount + ') ' : ' ') + email + ' - '
-				: '' + (0 < foldersInboxUnreadCount ? '(' + foldersInboxUnreadCount + ') ' : ' ') + email + ' - ') +
+				: ''
-				i18n('TITLES/MAILBOX')
+			) + i18n('TITLES/MAILBOX')
 		);
 	}
 
@@ -152,7 +152,7 @@ class MailBoxUserScreen extends AbstractScreen {
 				vals[1] = 0 >= vals[1] ? 1 : vals[1];
 				vals[2] = pString(vals[2]);
 
-				if ('' === request) {
+				if (!request) {
 					vals[0] = inboxFolderName;
 					vals[1] = 1;
 				}
@@ -163,7 +163,7 @@ class MailBoxUserScreen extends AbstractScreen {
 				vals[0] = pString(vals[0]);
 				vals[1] = pString(vals[1]);
 
-				if ('' === request) {
+				if (!request) {
 					vals[0] = inboxFolderName;
 				}
 

dev/Screen/User/Settings.js

@@ -120,7 +120,7 @@ class SettingsUserScreen extends AbstractSettingsScreen {
 
 	setSettingsTitle() {
 		const sEmail = AccountStore.email();
-		getApp().setWindowTitle(('' === sEmail ? '' : sEmail + ' - ') + this.sSettingsTitle);
+		getApp().setWindowTitle((sEmail ? sEmail + ' - ' :  '') + this.sSettingsTitle);
 	}
 }
 

dev/Settings/Admin/Contacts.js

@@ -102,7 +102,7 @@ class ContactsAdminSettings {
 		this.onTestContactsResponse = this.onTestContactsResponse.bind(this);
 	}
 
-	@command((self) => '' !== self.pdoDsn() && '' !== self.pdoUser())
+	@command((self) => self.pdoDsn() && self.pdoUser())
 	testContactsCommand() {
 		this.testContactsSuccess(false);
 		this.testContactsError(false);

dev/Settings/Admin/Packages.js

@@ -18,13 +18,13 @@ class PackagesAdminSettings {
 		this.packagesMainUpdatable = PackageStore.packagesMainUpdatable;
 
 		this.packagesCurrent = ko.computed(() =>
-			this.packages().filter(item => item && '' !== item.installed && !item.compare)
+			this.packages().filter(item => item && item.installed && !item.compare)
 		);
 		this.packagesAvailableForUpdate = ko.computed(() =>
-			this.packages().filter(item => item && '' !== item.installed && !!item.compare)
+			this.packages().filter(item => item && item.installed && !!item.compare)
 		);
 		this.packagesAvailableForInstallation = ko.computed(() =>
-			this.packages().filter(item => item && '' === item.installed)
+			this.packages().filter(item => item && !item.installed)
 		);
 
 		this.visibility = ko.computed(() => (PackageStore.packages.loading() ? 'visible' : 'hidden'));

dev/Settings/Admin/Plugins.js

@@ -78,7 +78,7 @@ class PluginsAdminSettings {
 	onPluginDisableRequest(result, data) {
 		if (StorageResultType.Success === result && data) {
 			if (!data.Result && data.ErrorCode) {
-				if (Notification.UnsupportedPluginPackage === data.ErrorCode && data.ErrorMessage && '' !== data.ErrorMessage) {
+				if (Notification.UnsupportedPluginPackage === data.ErrorCode && data.ErrorMessage && data.ErrorMessage) {
 					PluginStore.plugins.error(data.ErrorMessage);
 				} else {
 					PluginStore.plugins.error(getNotification(data.ErrorCode));

dev/Settings/Admin/Security.js

@@ -76,9 +76,9 @@ class SecurityAdminSettings {
 		this.onNewAdminPasswordResponse = this.onNewAdminPasswordResponse.bind(this);
 	}
 
-	@command((self) => '' !== trim(self.adminLogin()) && '' !== self.adminPassword())
+	@command((self) => trim(self.adminLogin()) && self.adminPassword())
 	saveNewAdminPasswordCommand() {
-		if ('' === trim(this.adminLogin())) {
+		if (!trim(this.adminLogin())) {
 			this.adminLoginError(true);
 			return false;
 		}

dev/Settings/User/Filters.js

@@ -61,7 +61,7 @@ class FiltersUserSettings {
 	@command((self) => self.haveChanges())
 	saveChangesCommand() {
 		if (!this.filters.saving()) {
-			if (this.filterRaw.active() && '' === trim(this.filterRaw())) {
+			if (this.filterRaw.active() && !trim(this.filterRaw())) {
 				this.filterRaw.error(true);
 				return false;
 			}

dev/Settings/User/Folders.js

@@ -44,7 +44,7 @@ class FoldersUserSettings {
 	folderEditOnEnter(folder) {
 		const nameToEdit = folder ? trim(folder.nameForEdit()) : '';
 
-		if ('' !== nameToEdit && folder.name() !== nameToEdit) {
+		if (nameToEdit && folder.name() !== nameToEdit) {
 			Local.set(ClientSideKeyName.FoldersLashHash, '');
 
 			getApp().foldersPromisesActionHelper(

dev/Settings/User/General.js

@@ -55,7 +55,7 @@ class GeneralUserSettings {
 
 		this.identityMain = ko.computed(() => {
 			const list = this.identities();
-			return isArray(list) ? list.find(item => item && '' === item.id()) : null;
+			return isArray(list) ? list.find(item => item && !item.id()) : null;
 		});
 
 		this.identityMainDesc = ko.computed(() => {

dev/Settings/User/Templates.js

@@ -16,7 +16,7 @@ class TemplatesUserSettings {
 		this.processText = ko.computed(() =>
 			TemplateStore.templates.loading() ? i18n('SETTINGS_TEMPLETS/LOADING_PROCESS') : ''
 		);
-		this.visibility = ko.computed(() => ('' === this.processText() ? 'hidden' : 'visible'));
+		this.visibility = ko.computed(() => this.processText() ? 'visible' : 'hidden');
 
 		this.templateForDeletion = ko.observable(null).deleteAccessHelper();
 	}

dev/Stores/User/Account.js

@@ -42,7 +42,7 @@ class AccountUserStore {
 	 * @returns {boolean}
 	 */
 	isRootAccount() {
-		return '' === this.parentEmail();
+		return !this.parentEmail();
 	}
 }
 

dev/Stores/User/Folder.js

@@ -42,7 +42,7 @@ class FolderUserStore {
 
 	computers() {
 		this.draftFolderNotEnabled = ko.computed(
-			() => '' === this.draftFolder() || UNUSED_OPTION_VALUE === this.draftFolder()
+			() => !this.draftFolder() || UNUSED_OPTION_VALUE === this.draftFolder()
 		);
 
 		this.foldersListWithSingleInboxRootFolder = ko.computed(
@@ -73,19 +73,19 @@ class FolderUserStore {
 				archiveFolder = this.archiveFolder();
 
 			if (isArray(folders) && folders.length) {
-				if ('' !== sentFolder && UNUSED_OPTION_VALUE !== sentFolder) {
+				if (sentFolder && UNUSED_OPTION_VALUE !== sentFolder) {
 					list.push(sentFolder);
 				}
-				if ('' !== draftFolder && UNUSED_OPTION_VALUE !== draftFolder) {
+				if (draftFolder && UNUSED_OPTION_VALUE !== draftFolder) {
 					list.push(draftFolder);
 				}
-				if ('' !== spamFolder && UNUSED_OPTION_VALUE !== spamFolder) {
+				if (spamFolder && UNUSED_OPTION_VALUE !== spamFolder) {
 					list.push(spamFolder);
 				}
-				if ('' !== trashFolder && UNUSED_OPTION_VALUE !== trashFolder) {
+				if (trashFolder && UNUSED_OPTION_VALUE !== trashFolder) {
 					list.push(trashFolder);
 				}
-				if ('' !== archiveFolder && UNUSED_OPTION_VALUE !== archiveFolder) {
+				if (archiveFolder && UNUSED_OPTION_VALUE !== archiveFolder) {
 					list.push(archiveFolder);
 				}
 			}

dev/Stores/User/Message.js

@@ -248,7 +248,7 @@ class MessageUserStore {
 	}
 
 	initUidNextAndNewMessages(folder, uidNext, newMessages) {
-		if (getFolderInboxName() === folder && isNormal(uidNext) && '' !== uidNext) {
+		if (getFolderInboxName() === folder && isNormal(uidNext) && uidNext) {
 			if (isArray(newMessages) && newMessages.length) {
 				newMessages.forEach(item => {
 					addNewMessageCache(folder, item.Uid);
@@ -305,7 +305,7 @@ class MessageUserStore {
 		const trashFolder = FolderStore.trashFolder(),
 			spamFolder = FolderStore.spamFolder(),
 			fromFolder = getFolderFromCacheList(fromFolderFullNameRaw),
-			toFolder = '' === toFolderFullNameRaw ? null : getFolderFromCacheList(toFolderFullNameRaw || ''),
+			toFolder = toFolderFullNameRaw ? getFolderFromCacheList(toFolderFullNameRaw) : null,
 			currentFolderFullNameRaw = FolderStore.currentFolderFullNameRaw(),
 			messages =
 				currentFolderFullNameRaw === fromFolderFullNameRaw
@@ -368,15 +368,15 @@ class MessageUserStore {
 			}
 		}
 
-		if ('' !== fromFolderFullNameRaw) {
+		if (fromFolderFullNameRaw) {
 			setFolderHash(fromFolderFullNameRaw, '');
 		}
 
-		if ('' !== toFolderFullNameRaw) {
+		if (toFolderFullNameRaw) {
 			setFolderHash(toFolderFullNameRaw, '');
 		}
 
-		if ('' !== this.messageListThreadUid()) {
+		if (this.messageListThreadUid()) {
 			messageList = this.messageList();
 
 			if (
@@ -448,7 +448,7 @@ class MessageUserStore {
 						h = getRealHeight($this);
 					}
 
-					if ('' !== trim($this.text()) && (0 === h || 100 < h)) {
+					if (trim($this.text()) && (0 === h || 100 < h)) {
 						$this.addClass('rl-bq-switcher hidden-bq');
 						$('<span class="rlBlockquoteSwitcher"><i class="icon-ellipsis" /></span>')
 							.insertBefore($this)
@@ -525,10 +525,10 @@ class MessageUserStore {
 					const textBody = messagesDom.find('#' + id);
 					if (!textBody || !textBody[0]) {
 						let isHtml = false;
-						if (isNormal(data.Result.Html) && '' !== data.Result.Html) {
+						if (isNormal(data.Result.Html) && data.Result.Html) {
 							isHtml = true;
 							resultHtml = data.Result.Html.toString();
-						} else if (isNormal(data.Result.Plain) && '' !== data.Result.Plain) {
+						} else if (isNormal(data.Result.Plain) && data.Result.Plain) {
 							isHtml = false;
 							resultHtml = plainToHtml(data.Result.Plain.toString(), false);
 

dev/View/Admin/Login.js

@@ -65,8 +65,8 @@ class LoginAdminView extends AbstractViewNext {
 		this.loginError(false);
 		this.passwordError(false);
 
-		this.loginError('' === trim(this.login()));
+		this.loginError(!trim(this.login()));
-		this.passwordError('' === trim(this.password()));
+		this.passwordError(!trim(this.password()));
 
 		if (this.loginError() || this.passwordError()) {
 			return false;

dev/View/Popup/Account.js

@@ -44,8 +44,8 @@ class AccountPopupView extends AbstractViewNext {
 
 	@command((self) => !self.submitRequest())
 	addAccountCommand() {
-		this.emailError('' === trim(this.email()));
+		this.emailError(!trim(this.email()));
-		this.passwordError('' === trim(this.password()));
+		this.passwordError(!trim(this.password()));
 
 		if (this.emailError() || this.passwordError()) {
 			return false;

dev/View/Popup/Activate.js

@@ -47,7 +47,7 @@ class ActivatePopupView extends AbstractViewNext {
 	}
 
 	@command(
-		(self) => !self.activateProcess() && '' !== self.domain() && '' !== self.key() && !self.activationSuccessed()
+		(self) => !self.activateProcess() && self.domain() && self.key() && !self.activationSuccessed()
 	)
 	activateCommand() {
 		this.activateProcess(true);
@@ -110,7 +110,7 @@ class ActivatePopupView extends AbstractViewNext {
 	validateSubscriptionKey() {
 		const value = this.key();
 		return (
-			'' === value ||
+			!value ||
 			RAINLOOP_TRIAL_KEY === value ||
 			!!/^RL[\d]+-[A-Z0-9-]+Z$/.test(trim(value).replace(/[^A-Z0-9-]/gi, ''))
 		);

dev/View/Popup/AddOpenPgpKey.js

@@ -39,7 +39,7 @@ class AddOpenPgpKeyPopupView extends AbstractViewNext {
 			keyTrimmed = keyTrimmed.replace(/[\r]+/g, '').replace(/[\n]{2,}/g, '\n\n');
 		}
 
-		this.key.error('' === keyTrimmed);
+		this.key.error(!keyTrimmed);
 		this.key.errorMessage('');
 
 		if (!openpgpKeyring || this.key.error()) {

dev/View/Popup/AdvancedSearch.js

@@ -46,7 +46,7 @@ class AdvancedSearchPopupView extends AbstractViewNext {
 	@command()
 	searchCommand() {
 		const search = this.buildSearchString();
-		if ('' !== search) {
+		if (search) {
 			MessageStore.mainMessageListSearch(search);
 		}
 
@@ -87,15 +87,15 @@ class AdvancedSearchPopupView extends AbstractViewNext {
 			isPart = [],
 			hasPart = [];
 
-		if (from_ && '' !== from_) {
+		if (from_) {
 			result.push('from:' + this.buildSearchStringValue(from_));
 		}
 
-		if (to && '' !== to) {
+		if (to) {
 			result.push('to:' + this.buildSearchStringValue(to));
 		}
 
-		if (subject && '' !== subject) {
+		if (subject) {
 			result.push('subject:' + this.buildSearchStringValue(subject));
 		}
 
@@ -123,7 +123,7 @@ class AdvancedSearchPopupView extends AbstractViewNext {
 			result.push('date:' + searchSubtractFormatDateHelper(this.selectedDateValue()) + '/');
 		}
 
-		if (text && '' !== text) {
+		if (text) {
 			result.push('text:' + this.buildSearchStringValue(text));
 		}
 

dev/View/Popup/Compose.js

@@ -227,12 +227,12 @@ class ComposePopupView extends AbstractViewNext {
 
 		this.attachmentsInProcess = ko.computed(() => this.attachments().filter(item => item && !item.complete()));
 		this.attachmentsInReady = ko.computed(() => this.attachments().filter(item => item && item.complete()));
-		this.attachmentsInError = ko.computed(() => this.attachments().filter(item => item && '' !== item.error()));
+		this.attachmentsInError = ko.computed(() => this.attachments().filter(item => item && item.error()));
 
 		this.attachmentsCount = ko.computed(() => this.attachments().length);
 		this.attachmentsInErrorCount = ko.computed(() => this.attachmentsInError().length);
 		this.attachmentsInProcessCount = ko.computed(() => this.attachmentsInProcess().length);
-		this.isDraftFolderMessage = ko.computed(() => '' !== this.draftFolder() && '' !== this.draftUid());
+		this.isDraftFolderMessage = ko.computed(() => this.draftFolder() && this.draftUid());
 
 		this.attachmentsPlace = ko.observable(false);
 
@@ -360,7 +360,7 @@ class ComposePopupView extends AbstractViewNext {
 			this.attachmentsPlace(true);
 		}
 
-		if ('' === sTo && '' === sCc && '' === sBcc) {
+		if (!sTo && !sCc && !sBcc) {
 			this.emptyToError(true);
 		}
 
@@ -380,7 +380,7 @@ class ComposePopupView extends AbstractViewNext {
 				sSentFolder = UNUSED_OPTION_VALUE;
 			}
 
-			if ('' === sSentFolder) {
+			if (!sSentFolder) {
 				showScreenPopup(require('View/Popup/FolderSystem'), [SetSystemFoldersNotification.Sent]);
 			} else {
 				this.sendError(false);
@@ -564,7 +564,7 @@ class ComposePopupView extends AbstractViewNext {
 
 	reloadDraftFolder() {
 		const draftFolder = FolderStore.draftFolder();
-		if ('' !== draftFolder && UNUSED_OPTION_VALUE !== draftFolder) {
+		if (draftFolder && UNUSED_OPTION_VALUE !== draftFolder) {
 			setFolderHash(draftFolder, '');
 			if (FolderStore.currentFolderFullNameRaw() === draftFolder) {
 				getApp().reloadMessageList(true);
@@ -736,7 +736,7 @@ class ComposePopupView extends AbstractViewNext {
 		signature = signature.replace(/[\r]/g, '');
 
 		fromLine = this.oLastMessage ? this.emailArrayToStringLineHelper(this.oLastMessage.from, true) : '';
-		if ('' !== fromLine) {
+		if (fromLine) {
 			signature = signature.replace(/{{FROM-FULL}}/g, fromLine);
 
 			if (!fromLine.includes(' ') && 0 < fromLine.indexOf('@')) {
@@ -793,7 +793,7 @@ class ComposePopupView extends AbstractViewNext {
 				let isHtml = false,
 					signature = identity.signature();
 
-				if ('' !== signature) {
+				if (signature) {
 					if (':HTML:' === signature.substr(0, 6)) {
 						isHtml = true;
 						signature = signature.substr(6);
@@ -837,7 +837,7 @@ class ComposePopupView extends AbstractViewNext {
 				this.addEmailsTo(this.cc, aCcEmails);
 				this.addEmailsTo(this.bcc, aBccEmails);
 
-				if (isNormal(sCustomSubject) && '' !== sCustomSubject && '' === this.subject()) {
+				if (isNormal(sCustomSubject) && sCustomSubject && !this.subject()) {
 					this.subject(sCustomSubject);
 				}
 			}
@@ -862,7 +862,7 @@ class ComposePopupView extends AbstractViewNext {
 				values = emails.map(item => item ? item.toLine(false) : null)
 					.filter((value, index, self) => !!value && self.indexOf(value) == index);
 
-			fKoValue(value + ('' === value ? '' : ', ') + trim(values.join(', ')));
+			fKoValue(value + (value ? ', ' :  '') + trim(values.join(', ')));
 		}
 	}
 
@@ -939,7 +939,7 @@ class ComposePopupView extends AbstractViewNext {
 			this.bcc(this.emailArrayToStringLineHelper(aBccEmails));
 		}
 
-		if ('' !== lineComposeType && message) {
+		if (lineComposeType && message) {
 			sDate = momentorFormat(message.dateTimeStampInUTC(), 'FULL');
 			sSubject = message.subject();
 			aDraftInfo = message.aDraftInfo;
@@ -1171,7 +1171,7 @@ class ComposePopupView extends AbstractViewNext {
 	setFocusInPopup() {
 		if (!bMobileDevice) {
 			setTimeout(() => {
-				if ('' === this.to()) {
+				if (!this.to()) {
 					this.to.focused(true);
 				} else if (this.oEditor) {
 					if (!this.to.focused()) {
@@ -1379,7 +1379,7 @@ class ComposePopupView extends AbstractViewNext {
 						}
 
 						if (attachment) {
-							if ('' !== error && error.length) {
+							if (error && error.length) {
 								attachment
 									.waiting(false)
 									.uploading(false)
@@ -1413,7 +1413,7 @@ class ComposePopupView extends AbstractViewNext {
 	prepearAttachmentsForSendOrSave() {
 		const result = {};
 		this.attachmentsInReady().forEach(item => {
-			if (item && '' !== item.tempName() && item.enabled()) {
+			if (item && item.tempName() && item.enabled()) {
 				result[item.tempName()] = [item.fileName(), item.isInline ? '1' : '0', item.CID, item.contentLocation];
 			}
 		});
@@ -1552,7 +1552,7 @@ class ComposePopupView extends AbstractViewNext {
 			!this.replyTo().length &&
 			!this.subject().length &&
 			withoutAttachment &&
-			(!this.oEditor || '' === this.oEditor.getData())
+			(!this.oEditor || !this.oEditor.getData())
 		);
 	}
 
@@ -1606,7 +1606,7 @@ class ComposePopupView extends AbstractViewNext {
 	 * @returns {Array}
 	 */
 	getAttachmentsDownloadsForUpload() {
-		return this.attachments().filter(item => item && '' === item.tempName()).map(
+		return this.attachments().filter(item => item && !item.tempName()).map(
 			item => item.id
 		);
 	}

dev/View/Popup/ComposeOpenPgp.js

@@ -345,15 +345,15 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 
 		this.resultCallback = fCallback;
 
-		if ('' !== sTo) {
+		if (sTo) {
 			rec.push(sTo);
 		}
 
-		if ('' !== sCc) {
+		if (sCc) {
 			rec.push(sCc);
 		}
 
-		if ('' !== sBcc) {
+		if (sBcc) {
 			rec.push(sBcc);
 		}
 
@@ -361,7 +361,7 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 		rec = rec.map(value => {
 				email.clear();
 				email.parse(trim(value));
-				return '' === email.email ? false : email.email;
+				return email.email || false;
 			}).filter(value => !!value);
 
 		if (identity && identity.email()) {

dev/View/Popup/Contacts.js

@@ -116,7 +116,7 @@ class ContactsPopupView extends AbstractViewNext {
 		this.viewHasNonEmptyRequiredProperties = ko.computed(() => {
 			const names = this.viewPropertiesNames(),
 				emails = this.viewPropertiesEmails(),
-				fFilter = (property) => '' !== trim(property.value());
+				fFilter = (property) => !!trim(property.value());
 
 			return !!(names.find(fFilter) || emails.find(fFilter));
 		});
@@ -126,12 +126,12 @@ class ContactsPopupView extends AbstractViewNext {
 		);
 
 		this.viewPropertiesEmailsNonEmpty = ko.computed(() =>
-			this.viewPropertiesNames().filter(property => '' !== trim(property.value()))
+			this.viewPropertiesNames().filter(property => !!trim(property.value()))
 		);
 
 		const propertyFocused = (property) => {
 			const focused = property.focused();
-			return '' === trim(property.value()) && !focused;
+			return !trim(property.value()) && !focused;
 		};
 
 		this.viewPropertiesEmailsEmptyAndOnFocused = ko.computed(() =>
@@ -303,7 +303,7 @@ class ContactsPopupView extends AbstractViewNext {
 			properties = [];
 
 		this.viewProperties().forEach(oItem => {
-			if (oItem.type() && oItem.type() !== ContactPropertyType.FullName && '' !== trim(oItem.value())) {
+			if (oItem.type() && oItem.type() !== ContactPropertyType.FullName && trim(oItem.value())) {
 				properties.push([oItem.type(), oItem.value(), oItem.typeStr()]);
 			}
 		});
@@ -320,7 +320,7 @@ class ContactsPopupView extends AbstractViewNext {
 					oData.Result.RequestUid === requestUid &&
 					0 < pInt(oData.Result.ResultID)
 				) {
-					if ('' === this.viewID()) {
+					if (!this.viewID()) {
 						this.viewID(pInt(oData.Result.ResultID));
 					}
 
@@ -610,7 +610,7 @@ class ContactsPopupView extends AbstractViewNext {
 				this.contacts(list);
 
 				this.contacts.loading(false);
-				this.viewClearSearch('' !== this.search());
+				this.viewClearSearch(!!this.search());
 			},
 			offset,
 			CONTACTS_PER_PAGE,

dev/View/Popup/Domain.js

@@ -97,10 +97,9 @@ class DomainPopupView extends AbstractViewNext {
 					result += ' ← ' + aliasName;
 				}
 			} else {
-				result =
+				result = name
-					'' === name
+						? i18n('POPUPS_DOMAIN/TITLE_ADD_DOMAIN_WITH_NAME', { 'NAME': name })
-						? i18n('POPUPS_DOMAIN/TITLE_ADD_DOMAIN')
+						: i18n('POPUPS_DOMAIN/TITLE_ADD_DOMAIN');
-						: i18n('POPUPS_DOMAIN/TITLE_ADD_DOMAIN_WITH_NAME', { 'NAME': name });
 			}
 
 			return result;
@@ -117,11 +116,11 @@ class DomainPopupView extends AbstractViewNext {
 				useSieve = this.useSieve();
 
 			return (
-				'' !== this.name() &&
+				this.name() &&
-				'' !== this.imapServer() &&
+				this.imapServer() &&
-				'' !== this.imapPort() &&
+				this.imapPort() &&
-				(allowSieve && useSieve ? '' !== this.sieveServer() && '' !== this.sievePort() : true) &&
+				(allowSieve && useSieve ? this.sieveServer() && this.sievePort() : true) &&
-				(('' !== this.smtpServer() && '' !== this.smtpPort()) || usePhpMail)
+				((this.smtpServer() && this.smtpPort()) || usePhpMail)
 			);
 		});
 
@@ -134,19 +133,19 @@ class DomainPopupView extends AbstractViewNext {
 
 		// smart form improvements
 		this.imapServerFocus.subscribe((value) => {
-			if (value && '' !== this.name() && '' === this.imapServer()) {
+			if (value && this.name() && !this.imapServer()) {
 				this.imapServer(this.name().replace(/[.]?[*][.]?/g, ''));
 			}
 		});
 
 		this.sieveServerFocus.subscribe((value) => {
-			if (value && '' !== this.imapServer() && '' === this.sieveServer()) {
+			if (value && this.imapServer() && !this.sieveServer()) {
 				this.sieveServer(this.imapServer());
 			}
 		});
 
 		this.smtpServerFocus.subscribe((value) => {
-			if (value && '' !== this.imapServer() && '' === this.smtpServer()) {
+			if (value && this.imapServer() && !this.smtpServer()) {
 				this.smtpServer(this.imapServer().replace(/imap/gi, 'smtp'));
 			}
 		});
@@ -381,7 +380,7 @@ class DomainPopupView extends AbstractViewNext {
 	}
 
 	onShowWithDelay() {
-		if ('' === this.name() && !bMobileDevice) {
+		if (!this.name() && !bMobileDevice) {
 			this.name.focused(true);
 		}
 	}

dev/View/Popup/DomainAlias.js

@@ -35,7 +35,7 @@ class DomainAliasPopupView extends AbstractViewNext {
 			this.domains().map(item => ({ optValue: item.name, optText: item.name }))
 		);
 
-		this.canBeSaved = ko.computed(() => !this.saving() && '' !== this.name() && '' !== this.alias());
+		this.canBeSaved = ko.computed(() => !this.saving() && this.name() && this.alias());
 
 		this.onDomainAliasCreateOrSaveResponse = this.onDomainAliasCreateOrSaveResponse.bind(this);
 	}
@@ -65,7 +65,7 @@ class DomainAliasPopupView extends AbstractViewNext {
 	}
 
 	onShowWithDelay() {
-		if ('' === this.name() && !bMobileDevice) {
+		if (!this.name() && !bMobileDevice) {
 			this.name.focused(true);
 		}
 	}

dev/View/Popup/FolderCreate.js

@@ -36,7 +36,7 @@ class FolderCreateView extends AbstractViewNext {
 			top.push(['', '']);
 
 			let fDisableCallback = null;
-			if ('' !== FolderStore.namespace) {
+			if (FolderStore.namespace) {
 				fDisableCallback = (item) => FolderStore.namespace !== item.fullNameRaw.substr(0, FolderStore.namespace.length);
 			}
 
@@ -49,7 +49,7 @@ class FolderCreateView extends AbstractViewNext {
 	@command((self) => self.simpleFolderNameValidation(self.folderName()))
 	createFolderCommand() {
 		let parentFolderName = this.selectedParentValue();
-		if ('' === parentFolderName && 1 < FolderStore.namespace.length) {
+		if (!parentFolderName && 1 < FolderStore.namespace.length) {
 			parentFolderName = FolderStore.namespace.substr(0, FolderStore.namespace.length - 1);
 		}
 

dev/View/Popup/Identity.js

@@ -62,7 +62,7 @@ class IdentityPopupView extends AbstractViewNext {
 		}
 
 		if (!this.email.hasError()) {
-			this.email.hasError('' === trim(this.email()));
+			this.email.hasError(!trim(this.email()));
 		}
 
 		if (this.email.hasError()) {
@@ -151,7 +151,7 @@ class IdentityPopupView extends AbstractViewNext {
 			this.signature(identity.signature());
 			this.signatureInsertBefore(identity.signatureInsertBefore());
 
-			this.owner('' === this.id);
+			this.owner(!this.id);
 		} else {
 			this.id = fakeMd5();
 		}

dev/View/Popup/NewOpenPgpKey.js

@@ -39,13 +39,13 @@ class NewOpenPgpKeyPopupView extends AbstractViewNext {
 		const userId = {},
 			openpgpKeyring = PgpStore.openpgpKeyring;
 
-		this.email.error('' === trim(this.email()));
+		this.email.error(!trim(this.email()));
 		if (!openpgpKeyring || this.email.error()) {
 			return false;
 		}
 
 		userId.email = this.email();
-		if ('' !== this.name()) {
+		if (this.name()) {
 			userId.name = this.name();
 		}
 

dev/View/Popup/Plugin.js

@@ -28,7 +28,7 @@ class PluginPopupView extends AbstractViewNext {
 
 		this.configures = ko.observableArray([]);
 
-		this.hasReadme = ko.computed(() => '' !== this.readme());
+		this.hasReadme = ko.computed(() => !!this.readme());
 		this.hasConfiguration = ko.computed(() => 0 < this.configures().length);
 
 		this.readmePopoverConf = {

dev/View/Popup/Template.js

@@ -49,8 +49,8 @@ class TemplatePopupView extends AbstractViewNext {
 	addTemplateCommand() {
 		this.populateBodyFromEditor();
 
-		this.name.error('' === trim(this.name()));
+		this.name.error(!trim(this.name()));
-		this.body.error('' === trim(this.body()) || ':HTML:' === trim(this.body()));
+		this.body.error(!trim(this.body()) || ':HTML:' === trim(this.body()));
 
 		if (this.name.error() || this.body.error()) {
 			return false;

dev/View/Popup/TwoFactorTest.js

@@ -25,7 +25,7 @@ class TwoFactorTestPopupView extends AbstractViewNext {
 		this.testing = ko.observable(false);
 	}
 
-	@command((self) => '' !== self.code() && !self.testing())
+	@command((self) => self.code() && !self.testing())
 	testCodeCommand() {
 		this.testing(true);
 		Remote.testTwoFactor((result, data) => {

dev/View/User/Login.js

@@ -115,7 +115,7 @@ class LoginUserView extends AbstractViewNext {
 		this.submitErrorAddidional = ko.observable('');
 
 		this.submitError.subscribe((value) => {
-			if ('' === value) {
+			if (!value) {
 				this.submitErrorAddidional('');
 			}
 		});
@@ -154,12 +154,12 @@ class LoginUserView extends AbstractViewNext {
 		this.emailError(false);
 		this.passwordError(false);
 
-		this.emailError('' === trim(this.email()));
+		this.emailError(!trim(this.email()));
-		this.passwordError('' === trim(this.password()));
+		this.passwordError(!trim(this.password()));
 
 		if (this.additionalCode.visibility()) {
 			this.additionalCode.error(false);
-			this.additionalCode.error('' === trim(this.additionalCode()));
+			this.additionalCode.error(!trim(this.additionalCode()));
 		}
 
 		if (
@@ -195,7 +195,7 @@ class LoginUserView extends AbstractViewNext {
 		if (0 < pluginResultCode) {
 			this.submitError(getNotification(pluginResultCode));
 			return false;
-		} else if ('' !== pluginResultMessage) {
+		} else if (pluginResultMessage) {
 			this.submitError(pluginResultMessage);
 			return false;
 		}
@@ -230,7 +230,7 @@ class LoginUserView extends AbstractViewNext {
 
 							this.submitError(getNotificationFromResponse(oData));
 
-							if ('' === this.submitError()) {
+							if (!this.submitError()) {
 								this.submitError(getNotification(Notification.UnknownError));
 							} else if (oData.ErrorMessageAdditional) {
 								this.submitErrorAddidional(oData.ErrorMessageAdditional);
@@ -269,11 +269,11 @@ class LoginUserView extends AbstractViewNext {
 	}
 
 	onShowWithDelay() {
-		if ('' !== this.email() && '' !== this.password()) {
+		if (this.email() && this.password()) {
 			this.passwordFocus(true);
-		} else if ('' === this.email()) {
+		} else if (!this.email()) {
 			this.emailFocus(true);
-		} else if ('' === this.password()) {
+		} else if (!this.password()) {
 			this.passwordFocus(true);
 		} else {
 			this.emailFocus(true);

dev/View/User/MailBox/FolderList.js

@@ -245,7 +245,7 @@ class FolderListMailBoxUserView extends AbstractViewNext {
 				copy = $htmlCL.contains('rl-ctrl-key-pressed'),
 				uids = ui.helper.data('rl-uids');
 
-			if (isNormal(fromFolderFullNameRaw) && '' !== fromFolderFullNameRaw && isArray(uids)) {
+			if (fromFolderFullNameRaw && isNormal(fromFolderFullNameRaw) && isArray(uids)) {
 				getApp().moveMessagesToFolder(fromFolderFullNameRaw, uids, toFolder.fullNameRaw, copy);
 			}
 		}

dev/View/User/MailBox/MessageList.js

@@ -135,7 +135,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 
 		this.messageListSearchDesc = ko.computed(() => {
 			const value = MessageStore.messageListEndSearch();
-			return '' === value ? '' : i18n('MESSAGE_LIST/SEARCH_RESULT_FOR', { 'SEARCH': value });
+			return value ? i18n('MESSAGE_LIST/SEARCH_RESULT_FOR', { 'SEARCH': value }) : '';
 		});
 
 		this.messageListPagenator = ko.computed(
@@ -172,25 +172,25 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 		this.hasCheckedOrSelectedLines = ko.computed(() => 0 < this.messageListCheckedOrSelected().length);
 
 		this.isSpamFolder = ko.computed(
-			() => FolderStore.spamFolder() === this.messageListEndFolder() && '' !== FolderStore.spamFolder()
+			() => FolderStore.spamFolder() === this.messageListEndFolder() && FolderStore.spamFolder()
 		);
 
 		this.isSpamDisabled = ko.computed(() => UNUSED_OPTION_VALUE === FolderStore.spamFolder());
 
 		this.isTrashFolder = ko.computed(
-			() => FolderStore.trashFolder() === this.messageListEndFolder() && '' !== FolderStore.trashFolder()
+			() => FolderStore.trashFolder() === this.messageListEndFolder() && FolderStore.trashFolder()
 		);
 
 		this.isDraftFolder = ko.computed(
-			() => FolderStore.draftFolder() === this.messageListEndFolder() && '' !== FolderStore.draftFolder()
+			() => FolderStore.draftFolder() === this.messageListEndFolder() && FolderStore.draftFolder()
 		);
 
 		this.isSentFolder = ko.computed(
-			() => FolderStore.sentFolder() === this.messageListEndFolder() && '' !== FolderStore.sentFolder()
+			() => FolderStore.sentFolder() === this.messageListEndFolder() && FolderStore.sentFolder()
 		);
 
 		this.isArchiveFolder = ko.computed(
-			() => FolderStore.archiveFolder() === this.messageListEndFolder() && '' !== FolderStore.archiveFolder()
+			() => FolderStore.archiveFolder() === this.messageListEndFolder() && FolderStore.archiveFolder()
 		);
 
 		this.isArchiveDisabled = ko.computed(() => UNUSED_OPTION_VALUE === FolderStore.archiveFolder());
@@ -538,7 +538,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 	 * @returns {void}
 	 */
 	setActionForAll(sFolderFullNameRaw, iSetAction, sThreadUid = '') {
-		if ('' !== sFolderFullNameRaw) {
+		if (sFolderFullNameRaw) {
 			let cnt = 0;
 			const uids = [];
 
@@ -728,9 +728,9 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 
 	clearListIsVisible() {
 		return (
-			'' === this.messageListSearchDesc() &&
+			!this.messageListSearchDesc() &&
-			'' === this.messageListError() &&
+			!this.messageListError() &&
-			'' === this.messageListEndThreadUid() &&
+			!this.messageListEndThreadUid() &&
 			this.messageList().length &&
 			(this.isSpamFolder() || this.isTrashFolder())
 		);
@@ -910,10 +910,10 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 
 		// cancel search
 		key('esc', KeyState.MessageList, () => {
-			if ('' !== this.messageListSearchDesc()) {
+			if (this.messageListSearchDesc()) {
 				this.cancelSearch();
 				return false;
-			} else if ('' !== this.messageListEndThreadUid()) {
+			} else if (this.messageListEndThreadUid()) {
 				this.cancelThreadUid();
 				return false;
 			}

dev/View/User/MailBox/MessageView.js

@@ -297,7 +297,7 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 					if (pic !== this.viewUserPic() && lastEmail === email) {
 						this.viewUserPicVisible(false);
 						this.viewUserPic(DATA_IMAGE_USER_DOT_PIC);
-						if ('' !== pic) {
+						if (pic) {
 							this.viewUserPicVisible(true);
 							this.viewUserPic(pic);
 						}
@@ -386,7 +386,7 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 
 		if (dom && 1 === dom.length) {
 			let aC = dom;
-			while ('' === result) {
+			while (!result) {
 				limit -= 1;
 				if (0 >= limit) {
 					break;
@@ -456,7 +456,7 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 	//				return sLine ? [window.decodeURIComponent(sLine)].map(sItem => {
 	//						var oEmailModel = new EmailModel();
 	//						oEmailModel.parse(sItem);
-	//						return '' !== oEmailModel.email ? oEmailModel : null;
+	//						return oEmailModel.email ? oEmailModel : null;
 	//					}).filter(value => !!value) : null;
 	//			}
 	//		;
@@ -930,7 +930,7 @@ class MessageViewMailBoxUserView extends AbstractViewNext {
 	 * @returns {void}
 	 */
 	readReceipt(oMessage) {
-		if (oMessage && '' !== oMessage.readReceipt()) {
+		if (oMessage && oMessage.readReceipt()) {
 			Remote.sendReadReceiptMessage(
 				noop,
 				oMessage.folderFullNameRaw,

vendors/ckeditor-plugins/signature/plugin.js

@@ -1,5 +1,5 @@
 
-(function(CKEDITOR, $, undefined) {
+(function(CKEDITOR, $) {
 
 	'use strict';
 
@@ -13,10 +13,10 @@
 				return $.trim(editor.__textUtils.htmlToPlain(html));
 			};
 
-		isEmptyText = '' === $.trim(text);
+		isEmptyText = !$.trim(text);
 		if (!isEmptyText && isHtml)
 		{
-			isEmptyText = '' === clearHtmlLine(text);
+			isEmptyText = !clearHtmlLine(text);
 		}
 
 		if (editor.__previos_signature && !isEmptyText)

vendors/jua/jua.js

@@ -190,7 +190,7 @@
 			sFileName = sFileName.substr(1);
 		}
 
-		if ('' === sType && 0 === iSize)
+		if (!sType && 0 === iSize)
 		{
 			return null; // Folder
 		}