Switch from ko.computed to ko.pureComputed

This should provide performance and memory benefits over regular computed observables

dev/Common/Selector.js

@@ -1,5 +1,6 @@
 import ko from 'ko';
 import { isArray } from 'Common/Utils';
+import { koComputable } from 'External/ko';
 
 /*
 	oCallbacks:
@@ -28,8 +29,8 @@ export class Selector {
 		sItemFocusedSelector
 	) {
 		this.list = koList;
-		this.listChecked = ko.computed(() => this.list.filter(item => item.checked())).extend({ rateLimit: 0 });
+		this.listChecked = koComputable(() => this.list.filter(item => item.checked())).extend({ rateLimit: 0 });
-		this.isListChecked = ko.computed(() => 0 < this.listChecked().length);
+		this.isListChecked = koComputable(() => 0 < this.listChecked().length);
 
 		this.focusedItem = koFocusedItem || ko.observable(null);
 		this.selectedItem = koSelectedItem || ko.observable(null);

dev/Component/AbstractInput.js

@@ -2,6 +2,7 @@ import ko from 'ko';
 import { pInt } from 'Common/Utils';
 import { SaveSettingsStep } from 'Common/Enums';
 import { AbstractComponent } from 'Component/Abstract';
+import { koComputable } from 'External/ko';
 
 class AbstractInput extends AbstractComponent {
 	/**
@@ -18,7 +19,7 @@ class AbstractInput extends AbstractComponent {
 
 		this.labeled = null != params.label;
 
-		let size = params.size || 0;
+		let size = 0 < params.size ? 'span' + params.size : '';
 		if (this.trigger) {
 			const
 				classForTrigger = ko.observable(''),
@@ -38,13 +39,13 @@ class AbstractInput extends AbstractComponent {
 
 			setTriggerState(this.trigger());
 
-			this.className = ko.computed(() =>
+			this.className = koComputable(() =>
-				((0 < size ? 'span' + size : '') + ' settings-saved-trigger-input ' + classForTrigger()).trim()
+				(size + ' settings-saved-trigger-input ' + classForTrigger()).trim()
 			);
 
 			this.disposable.push(this.trigger.subscribe(setTriggerState, this));
 		} else {
-			this.className = ko.computed(() => 0 < size ? 'span' + size : '');
+			this.className = size;
 		}
 
 		this.disposable.push(this.className);

dev/External/ko.js

@@ -3,6 +3,13 @@ import { doc, createElement } from 'Common/Globals';
 import { SaveSettingsStep } from 'Common/Enums';
 import { arrayLength, isFunction } from 'Common/Utils';
 
+/**
+ * The value of the pureComputed observable shouldn’t vary based on the
+ * number of evaluations or other “hidden” information. Its value should be
+ * based solely on the values of other observables in the application
+ */
+export const koComputable = ko.pureComputed;
+
 ko.bindingHandlers.tooltipErrorTip = {
 	init: (element, fValueAccessor) => {
 		doc.addEventListener('click', () => {

dev/Knoin/Knoin.js

@@ -1,5 +1,5 @@
 import ko from 'ko';
-
+import { koComputable } from 'External/ko';
 import { doc, $htmlCL, elementById } from 'Common/Globals';
 import { isFunction, forEachObjectValue, forEachObjectEntry } from 'Common/Utils';
 
@@ -271,9 +271,9 @@ export const
 		fResult.isCommand = true;
 
 		if (isFunction(fCanExecute)) {
-			fResult.canExecute = ko.computed(() => fResult && fResult.enabled() && fCanExecute.call(null));
+			fResult.canExecute = koComputable(() => fResult && fResult.enabled() && fCanExecute.call(null));
 		} else {
-			fResult.canExecute = ko.computed(() => fResult && fResult.enabled() && !!fCanExecute);
+			fResult.canExecute = koComputable(() => fResult && fResult.enabled() && !!fCanExecute);
 		}
 
 		return fResult;
@@ -355,8 +355,8 @@ export const
 			fn.enabled = ko.observable(true);
 
 			fn.canExecute = (typeof canExecute === 'function')
-				? ko.computed(() => fn.enabled() && canExecute.call(thisArg, thisArg))
+				? koComputable(() => fn.enabled() && canExecute.call(thisArg, thisArg))
-				: ko.computed(() => fn.enabled());
+				: koComputable(() => fn.enabled());
 
 			thisArg[key] = fn;
 		});

dev/Model/FilterCondition.js

@@ -1,4 +1,4 @@
-import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { AbstractModel } from 'Knoin/AbstractModel';
 
@@ -43,7 +43,7 @@ export class FilterConditionModel extends AbstractModel {
 			valueSecondError: false
 		});
 
-		this.template = ko.computed(() => {
+		this.template = koComputable(() => {
 			const template = 'SettingsFiltersCondition';
 			switch (this.field()) {
 				case FilterConditionField.Body:

dev/Model/FolderCollection.js

@@ -20,6 +20,8 @@ import { i18n, trigger as translatorTrigger } from 'Common/Translator';
 
 import { AbstractModel } from 'Knoin/AbstractModel';
 
+import { koComputable } from 'External/ko';
+
 //import { mailBox } from 'Common/Links';
 
 const
@@ -265,7 +267,7 @@ export class FolderModel extends AbstractModel {
 
 			type && 'mail' != type && folder.kolabType(type);
 
-			folder.messageCountAll = ko.computed({
+			folder.messageCountAll = koComputable({
 					read: folder.privateMessageCountAll,
 					write: (iValue) => {
 						if (isPosNumeric(iValue)) {
@@ -277,7 +279,7 @@ export class FolderModel extends AbstractModel {
 				})
 				.extend({ notify: 'always' });
 
-			folder.messageCountUnread = ko.computed({
+			folder.messageCountUnread = koComputable({
 					read: folder.privateMessageCountUnread,
 					write: (value) => {
 						if (isPosNumeric(value)) {

dev/Model/Identity.js

@@ -1,4 +1,4 @@
-import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { AbstractModel } from 'Knoin/AbstractModel';
 
@@ -24,7 +24,7 @@ export class IdentityModel extends AbstractModel {
 			deleteAccess: false
 		});
 
-		this.canBeDeleted = ko.computed(() => !!this.id());
+		this.canBeDeleted = koComputable(() => !!this.id());
 	}
 
 	/**

dev/Settings/User/Folders.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { Notification } from 'Common/Enums';
 import { FolderMetadataKeys } from 'Common/EnumsUser';
@@ -25,7 +26,7 @@ const folderForDeletion = ko.observable(null).deleteAccessHelper();
 
 export class FoldersUserSettings /*extends AbstractViewSettings*/ {
 	constructor() {
-		this.showKolab = ko.computed(() => FolderUserStore.hasCapability('METADATA') && Settings.capa(Capa.Kolab));
+		this.showKolab = koComputable(() => FolderUserStore.hasCapability('METADATA') && Settings.capa(Capa.Kolab));
 		this.defaultOptionsAfterRender = defaultOptionsAfterRender;
 		this.kolabTypeOptions = ko.observableArray();
 		let i18nFilter = key => i18n('SETTINGS_FOLDERS/TYPE_' + key);
@@ -48,7 +49,7 @@ export class FoldersUserSettings /*extends AbstractViewSettings*/ {
 		this.folderListError = FolderUserStore.folderListError;
 		this.hideUnsubscribed = SettingsUserStore.hideUnsubscribed;
 
-		this.loading = ko.computed(() => {
+		this.loading = koComputable(() => {
 			const loading = FolderUserStore.foldersLoading(),
 				creating = FolderUserStore.foldersCreating(),
 				deleting = FolderUserStore.foldersDeleting(),

dev/Settings/User/Security.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { pInt, settingsSaveHelperSimpleFunction } from 'Common/Utils';
 import { Capa, SaveSettingsStep } from 'Common/Enums';
@@ -17,7 +18,7 @@ export class SecurityUserSettings /*extends AbstractViewSettings*/ {
 		this.autoLogoutTrigger = ko.observable(SaveSettingsStep.Idle);
 
 		let i18nLogout = (key, params) => i18n('SETTINGS_SECURITY/AUTOLOGIN_' + key, params);
-		this.autoLogoutOptions = ko.computed(() => {
+		this.autoLogoutOptions = koComputable(() => {
 			translatorTrigger();
 			return [
 				{ id: 0, name: i18nLogout('NEVER_OPTION_NAME') },

dev/Stores/User/Folder.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { FolderType, FolderSortMode } from 'Common/EnumsUser';
 import { UNUSED_OPTION_VALUE } from 'Common/Consts';
@@ -100,7 +101,7 @@ export const FolderUserStore = new class {
 			archiveFolder: fSetSystemFolderType(FolderType.Archive)
 		});
 
-		self.quotaPercentage = ko.computed(() => {
+		self.quotaPercentage = koComputable(() => {
 			const quota = self.quotaLimit(), usage = self.quotaUsage();
 			return 0 < quota ? Math.ceil((usage / quota) * 100) : 0;
 		});

dev/Stores/User/Settings.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { Layout, EditorDefaultType } from 'Common/EnumsUser';
 import { pInt, addObservablesTo } from 'Common/Utils';
@@ -39,7 +40,7 @@ export const SettingsUserStore = new class {
 
 		self.init();
 
-		self.usePreviewPane = ko.computed(() => Layout.NoPreview !== self.layout() && !ThemeStore.isMobile());
+		self.usePreviewPane = koComputable(() => Layout.NoPreview !== self.layout() && !ThemeStore.isMobile());
 
 		const toggleLayout = () => {
 			const value = ThemeStore.isMobile() ? Layout.NoPreview : self.layout();

dev/View/Popup/AdvancedSearch.js

@@ -1,4 +1,4 @@
-import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { i18n, trigger as translatorTrigger } from 'Common/Translator';
 
@@ -25,10 +25,10 @@ class AdvancedSearchPopupView extends AbstractViewPopup {
 			unseen: false
 		});
 
-		this.showMultisearch = ko.computed(() => FolderUserStore.hasCapability('MULTISEARCH'));
+		this.showMultisearch = koComputable(() => FolderUserStore.hasCapability('MULTISEARCH'));
 
 		let prefix = 'SEARCH/LABEL_ADV_DATE_';
-		this.selectedDates = ko.computed(() => {
+		this.selectedDates = koComputable(() => {
 			translatorTrigger();
 			return [
 				{ id: -1, name: i18n(prefix + 'ALL') },
@@ -42,7 +42,7 @@ class AdvancedSearchPopupView extends AbstractViewPopup {
 		});
 
 		prefix = 'SEARCH/LABEL_ADV_SUBFOLDERS_';
-		this.selectedTree = ko.computed(() => {
+		this.selectedTree = koComputable(() => {
 			translatorTrigger();
 			return [
 				{ id: '', name: i18n(prefix + 'NONE') },

dev/View/Popup/Filter.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { FilterAction } from 'Model/Filter';
 import { FilterConditionField, FilterConditionType } from 'Model/FilterCondition';
@@ -27,7 +28,7 @@ class FilterPopupView extends AbstractViewPopup {
 		this.fTrueCallback = null;
 
 		this.defaultOptionsAfterRender = defaultOptionsAfterRender;
-		this.folderSelectList = ko.computed(() =>
+		this.folderSelectList = koComputable(() =>
 			folderListOptionsBuilder(
 				[SettingsGet('SieveAllowFileintoInbox') ? '' : 'INBOX'],
 				[['', '']],

dev/View/Popup/FolderCreate.js

@@ -1,4 +1,4 @@
-import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { Notification } from 'Common/Enums';
 import { UNUSED_OPTION_VALUE } from 'Common/Consts';
@@ -26,7 +26,7 @@ class FolderCreatePopupView extends AbstractViewPopup {
 			selectedParentValue: UNUSED_OPTION_VALUE
 		});
 
-		this.parentFolderSelectList = ko.computed(() =>
+		this.parentFolderSelectList = koComputable(() =>
 			folderListOptionsBuilder(
 				[],
 				[['', '']],

dev/View/Popup/FolderSystem.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { SetSystemFoldersNotification } from 'Common/EnumsUser';
 import { UNUSED_OPTION_VALUE } from 'Common/Consts';
@@ -24,7 +25,7 @@ class FolderSystemPopupView extends AbstractViewPopup {
 
 		this.notification = ko.observable('');
 
-		this.folderSelectList = ko.computed(() =>
+		this.folderSelectList = koComputable(() =>
 			folderListOptionsBuilder(
 				FolderUserStore.folderListSystemNames(),
 				[

dev/View/Popup/Languages.js

@@ -1,4 +1,5 @@
 import ko from 'ko';
+import { koComputable } from 'External/ko';
 
 import { convertLangName } from 'Common/Translator';
 
@@ -13,7 +14,7 @@ class LanguagesPopupView extends AbstractViewPopup {
 
 		this.langs = ko.observableArray();
 
-		this.languages = ko.computed(() => {
+		this.languages = koComputable(() => {
 			const userLanguage = this.userLanguage();
 			return this.langs.map(language => ({
 				key: language,

dev/View/User/MailBox/MessageList.js

@@ -64,10 +64,6 @@ export class MailMessageList extends AbstractViewRight {
 
 		this.messageList = MessageUserStore.list;
 
-		this.sortSupported = ko.computed(() =>
-			FolderUserStore.hasCapability('SORT') | FolderUserStore.hasCapability('ESORT')
-		);
-
 		this.composeInEdit = AppUserStore.composeInEdit;
 
 		this.isMobile = ThemeStore.isMobile;
@@ -107,6 +103,9 @@ export class MailMessageList extends AbstractViewRight {
 
 		this.addComputables({
 
+			sortSupported: () =>
+				FolderUserStore.hasCapability('SORT') | FolderUserStore.hasCapability('ESORT'),
+
 			folderMenuForMove: () =>
 				folderListOptionsBuilder(
 					[FolderUserStore.currentFolderFullName()],

dev/View/User/SystemDropDown.js

@@ -20,6 +20,7 @@ import { ThemeStore } from 'Stores/Theme';
 import Remote from 'Remote/User/Fetch';
 import { getNotification } from 'Common/Translator';
 //import { clearCache } from 'Common/Cache';
+//import { koComputable } from 'External/ko';
 
 export class SystemDropDownUserView extends AbstractViewRight {
 	constructor() {
@@ -32,8 +33,8 @@ export class SystemDropDownUserView extends AbstractViewRight {
 		this.accounts = AccountUserStore.accounts;
 		this.accountsLoading = AccountUserStore.loading;
 /*
-		this.accountsUnreadCount = : ko.computed(() => 0);
+		this.accountsUnreadCount = : koComputable(() => 0);
-		this.accountsUnreadCount = : ko.computed(() => AccountUserStore.accounts().reduce((result, item) => result + item.count(), 0));
+		this.accountsUnreadCount = : koComputable(() => AccountUserStore.accounts().reduce((result, item) => result + item.count(), 0));
 */
 
 		this.addObservables({