Replace prettier by stylistic to lint JavaScript (#3303)

In the latest versions of ESLint, more and more formatting rules were
removed or declared deprecated. These rules have been integrated into
the new Stylistic package (https://eslint.style/guide/why) and expanded.

Stylistic acts as a better formatter  for JavaScript as Prettier.

With this PR there are many changes that make the code more uniform, but
it may be difficult to review due to the large amount. Even if I have no
worries about the changes, perhaps this would be something for the
release after next.

Let me know what you think.

modules/default/newsfeed/newsfeed.js

@@ -42,7 +42,7 @@ Module.register("newsfeed", {
 		dangerouslyDisableAutoEscaping: false
 	},
 
-	getUrlPrefix: function (item) {
+	getUrlPrefix (item) {
 		if (item.useCorsProxy) {
 			return `${location.protocol}//${location.host}/cors?url=`;
 		} else {
@@ -51,17 +51,17 @@ Module.register("newsfeed", {
 	},
 
 	// Define required scripts.
-	getScripts: function () {
+	getScripts () {
 		return ["moment.js"];
 	},
 
 	//Define required styles.
-	getStyles: function () {
+	getStyles () {
 		return ["newsfeed.css"];
 	},
 
 	// Define required translations.
-	getTranslations: function () {
+	getTranslations () {
 		// The translations for the default modules are defined in the core translation files.
 		// Therefor we can just return false. Otherwise we should have returned a dictionary.
 		// If you're trying to build your own module including translations, check out the documentation.
@@ -69,7 +69,7 @@ Module.register("newsfeed", {
 	},
 
 	// Define start sequence.
-	start: function () {
+	start () {
 		Log.info(`Starting module: ${this.name}`);
 
 		// Set locale.
@@ -87,7 +87,7 @@ Module.register("newsfeed", {
 	},
 
 	// Override socket notification handler.
-	socketNotificationReceived: function (notification, payload) {
+	socketNotificationReceived (notification, payload) {
 		if (notification === "NEWS_ITEMS") {
 			this.generateFeed(payload);
 
@@ -107,7 +107,7 @@ Module.register("newsfeed", {
 	},
 
 	//Override fetching of template name
-	getTemplate: function () {
+	getTemplate () {
 		if (this.config.feedUrl) {
 			return "oldconfig.njk";
 		} else if (this.config.showFullArticle) {
@@ -117,7 +117,7 @@ Module.register("newsfeed", {
 	},
 
 	//Override template data and return whats used for the current template
-	getTemplateData: function () {
+	getTemplateData () {
 		// this.config.showFullArticle is a run-time configuration, triggered by optional notifications
 		if (this.config.showFullArticle) {
 			return {
@@ -156,7 +156,7 @@ Module.register("newsfeed", {
 		};
 	},
 
-	getActiveItemURL: function () {
+	getActiveItemURL () {
 		const item = this.newsItems[this.activeItem];
 		if (item) {
 			return typeof item.url === "string" ? this.getUrlPrefix(item) + item.url : this.getUrlPrefix(item) + item.url.href;
@@ -168,7 +168,7 @@ Module.register("newsfeed", {
 	/**
 	 * Registers the feeds to be used by the backend.
 	 */
-	registerFeeds: function () {
+	registerFeeds () {
 		for (let feed of this.config.feeds) {
 			this.sendSocketNotification("ADD_FEED", {
 				feed: feed,
@@ -181,7 +181,7 @@ Module.register("newsfeed", {
 	 * Generate an ordered list of items for this configured module.
 	 * @param {object} feeds An object with feeds returned by the node helper.
 	 */
-	generateFeed: function (feeds) {
+	generateFeed (feeds) {
 		let newsItems = [];
 		for (let feed in feeds) {
 			const feedItems = feeds[feed];
@@ -274,7 +274,7 @@ Module.register("newsfeed", {
 	 * @param {string} feedUrl Url of the feed to check.
 	 * @returns {boolean} True if it is subscribed, false otherwise
 	 */
-	subscribedToFeed: function (feedUrl) {
+	subscribedToFeed (feedUrl) {
 		for (let feed of this.config.feeds) {
 			if (feed.url === feedUrl) {
 				return true;
@@ -288,7 +288,7 @@ Module.register("newsfeed", {
 	 * @param {string} feedUrl Url of the feed
 	 * @returns {string} The title of the feed
 	 */
-	titleForFeed: function (feedUrl) {
+	titleForFeed (feedUrl) {
 		for (let feed of this.config.feeds) {
 			if (feed.url === feedUrl) {
 				return feed.title || "";
@@ -300,7 +300,7 @@ Module.register("newsfeed", {
 	/**
 	 * Schedule visual update.
 	 */
-	scheduleUpdateInterval: function () {
+	scheduleUpdateInterval () {
 		this.updateDom(this.config.animationSpeed);
 
 		// Broadcast NewsFeed if needed
@@ -322,7 +322,7 @@ Module.register("newsfeed", {
 		}, this.config.updateInterval);
 	},
 
-	resetDescrOrFullArticleAndTimer: function () {
+	resetDescrOrFullArticleAndTimer () {
 		this.isShowingDescription = this.config.showDescription;
 		this.config.showFullArticle = false;
 		this.scrollPosition = 0;
@@ -333,7 +333,7 @@ Module.register("newsfeed", {
 		}
 	},
 
-	notificationReceived: function (notification, payload, sender) {
+	notificationReceived (notification, payload, sender) {
 		const before = this.activeItem;
 		if (notification === "MODULE_DOM_CREATED" && this.config.hideLoading) {
 			this.hide();
@@ -394,7 +394,7 @@ Module.register("newsfeed", {
 		}
 	},
 
-	showFullArticle: function () {
+	showFullArticle () {
 		this.isShowingDescription = !this.isShowingDescription;
 		this.config.showFullArticle = !this.isShowingDescription;
 		// make bottom bar align to top to allow scrolling