Update Prettier to version 2.0

Please note that these changes were done automatically, using `gulp lint --fix`.

Given that the major version number was increased, there's a fair number of (primarily whitespace) changes; please see https://prettier.io/blog/2020/03/21/2.0.0.html
In order to reduce the size of these changes somewhat, this patch maintains the old "arrowParens" style for now (once mozilla-central updates Prettier we can simply choose the same formatting, assuming it will differ here).

Author: Snuffleupagus

.prettierrc

@@ -1,4 +1,5 @@
 {
+  "arrowParens": "avoid",
   "endOfLine": "lf",
   "printWidth": 80,
   "semi": true,

examples/acroforms/acroforms.js

@@ -27,14 +27,14 @@ var eventBus = new pdfjsViewer.EventBus();
 
 // Fetch the PDF document from the URL using promises.
 var loadingTask = pdfjsLib.getDocument(DEFAULT_URL);
-loadingTask.promise.then(function(doc) {
+loadingTask.promise.then(function (doc) {
   // Use a promise to fetch and render the next page.
   var promise = Promise.resolve();
 
   for (var i = 1; i <= doc.numPages; i++) {
     promise = promise.then(
-      function(pageNum) {
-        return doc.getPage(pageNum).then(function(pdfPage) {
+      function (pageNum) {
+        return doc.getPage(pageNum).then(function (pdfPage) {
           // Create the page view.
           var pdfPageView = new pdfjsViewer.PDFPageView({
             container: container,

examples/browserify/gulpfile.js

@@ -8,7 +8,7 @@ var source = require("vinyl-source-stream");
 var OUTPUT_PATH = "../../build/browserify";
 var TMP_FILE_PREFIX = "../../build/browserify_";
 
-gulp.task("build-bundle", function() {
+gulp.task("build-bundle", function () {
   return browserify("main.js", { output: TMP_FILE_PREFIX + "main.tmp" })
     .ignore(require.resolve("pdfjs-dist/build/pdf.worker")) // Reducing size
     .bundle()
@@ -18,7 +18,7 @@ gulp.task("build-bundle", function() {
     .pipe(gulp.dest(OUTPUT_PATH));
 });
 
-gulp.task("build-worker", function() {
+gulp.task("build-worker", function () {
   // We can create our own viewer (see worker.js) or use already defined one.
   var workerSrc = require.resolve("pdfjs-dist/build/pdf.worker.entry");
   return browserify(workerSrc, { output: TMP_FILE_PREFIX + "worker.tmp" })

examples/browserify/main.js

@@ -14,9 +14,9 @@ pdfjsLib.GlobalWorkerOptions.workerSrc =
 // Loading a document.
 var loadingTask = pdfjsLib.getDocument(pdfPath);
 loadingTask.promise
-  .then(function(pdfDocument) {
+  .then(function (pdfDocument) {
     // Request a first page
-    return pdfDocument.getPage(1).then(function(pdfPage) {
+    return pdfDocument.getPage(1).then(function (pdfPage) {
       // Display page on the existing canvas with 100% scale.
       var viewport = pdfPage.getViewport({ scale: 1.0 });
       var canvas = document.getElementById("theCanvas");
@@ -30,6 +30,6 @@ loadingTask.promise
       return renderTask.promise;
     });
   })
-  .catch(function(reason) {
+  .catch(function (reason) {
     console.error("Error: " + reason);
   });

examples/components/pageviewer.js

@@ -43,9 +43,9 @@ var loadingTask = pdfjsLib.getDocument({
   cMapUrl: CMAP_URL,
   cMapPacked: CMAP_PACKED,
 });
-loadingTask.promise.then(function(pdfDocument) {
+loadingTask.promise.then(function (pdfDocument) {
   // Document loaded, retrieving the page.
-  return pdfDocument.getPage(PAGE_TO_VIEW).then(function(pdfPage) {
+  return pdfDocument.getPage(PAGE_TO_VIEW).then(function (pdfPage) {
     // Creating the page view with default parameters.
     var pdfPageView = new pdfjsViewer.PDFPageView({
       container: container,

examples/components/simpleviewer.js

@@ -55,7 +55,7 @@ var pdfViewer = new pdfjsViewer.PDFViewer({
 });
 pdfLinkService.setViewer(pdfViewer);
 
-eventBus.on("pagesinit", function() {
+eventBus.on("pagesinit", function () {
   // We can use pdfViewer now, e.g. let's change default scale.
   pdfViewer.currentScaleValue = "page-width";
 
@@ -71,7 +71,7 @@ var loadingTask = pdfjsLib.getDocument({
   cMapUrl: CMAP_URL,
   cMapPacked: CMAP_PACKED,
 });
-loadingTask.promise.then(function(pdfDocument) {
+loadingTask.promise.then(function (pdfDocument) {
   // Document loaded, specifying document for the viewer and
   // the (optional) linkService.
   pdfViewer.setDocument(pdfDocument);

examples/components/singlepageviewer.js

@@ -55,7 +55,7 @@ var pdfSinglePageViewer = new pdfjsViewer.PDFSinglePageViewer({
 });
 pdfLinkService.setViewer(pdfSinglePageViewer);
 
-eventBus.on("pagesinit", function() {
+eventBus.on("pagesinit", function () {
   // We can use pdfSinglePageViewer now, e.g. let's change default scale.
   pdfSinglePageViewer.currentScaleValue = "page-width";
 
@@ -71,7 +71,7 @@ var loadingTask = pdfjsLib.getDocument({
   cMapUrl: CMAP_URL,
   cMapPacked: CMAP_PACKED,
 });
-loadingTask.promise.then(function(pdfDocument) {
+loadingTask.promise.then(function (pdfDocument) {
   // Document loaded, specifying document for the viewer and
   // the (optional) linkService.
   pdfSinglePageViewer.setDocument(pdfDocument);

examples/mobile-viewer/viewer.js

@@ -47,11 +47,11 @@ var PDFViewerApplication = {
    * @returns {Promise} - Returns the promise, which is resolved when document
    *                      is opened.
    */
-  open: function(params) {
+  open: function (params) {
     if (this.pdfLoadingTask) {
       // We need to destroy already opened document
       return this.close().then(
-        function() {
+        function () {
           // ... and repeat the open() call.
           return this.open(params);
         }.bind(this)
@@ -71,12 +71,12 @@ var PDFViewerApplication = {
     });
     this.pdfLoadingTask = loadingTask;
 
-    loadingTask.onProgress = function(progressData) {
+    loadingTask.onProgress = function (progressData) {
       self.progress(progressData.loaded / progressData.total);
     };
 
     return loadingTask.promise.then(
-      function(pdfDocument) {
+      function (pdfDocument) {
         // Document loaded, specifying document for the viewer.
         self.pdfDocument = pdfDocument;
         self.pdfViewer.setDocument(pdfDocument);
@@ -86,7 +86,7 @@ var PDFViewerApplication = {
         self.loadingBar.hide();
         self.setTitleUsingMetadata(pdfDocument);
       },
-      function(exception) {
+      function (exception) {
         var message = exception && exception.message;
         var l10n = self.l10n;
         var loadingErrorMessage;
@@ -119,7 +119,7 @@ var PDFViewerApplication = {
           );
         }
 
-        loadingErrorMessage.then(function(msg) {
+        loadingErrorMessage.then(function (msg) {
           self.error(msg, { message: message });
         });
         self.loadingBar.hide();
@@ -132,7 +132,7 @@ var PDFViewerApplication = {
    * @returns {Promise} - Returns the promise, which is resolved when all
    *                      destruction is completed.
    */
-  close: function() {
+  close: function () {
     var errorWrapper = document.getElementById("errorWrapper");
     errorWrapper.setAttribute("hidden", "true");
 
@@ -175,9 +175,9 @@ var PDFViewerApplication = {
     this.setTitle(title);
   },
 
-  setTitleUsingMetadata: function(pdfDocument) {
+  setTitleUsingMetadata: function (pdfDocument) {
     var self = this;
-    pdfDocument.getMetadata().then(function(data) {
+    pdfDocument.getMetadata().then(function (data) {
       var info = data.info,
         metadata = data.metadata;
       self.documentInfo = info;
@@ -275,27 +275,27 @@ var PDFViewerApplication = {
     errorMessage.textContent = message;
 
     var closeButton = document.getElementById("errorClose");
-    closeButton.onclick = function() {
+    closeButton.onclick = function () {
       errorWrapper.setAttribute("hidden", "true");
     };
 
     var errorMoreInfo = document.getElementById("errorMoreInfo");
     var moreInfoButton = document.getElementById("errorShowMore");
     var lessInfoButton = document.getElementById("errorShowLess");
-    moreInfoButton.onclick = function() {
+    moreInfoButton.onclick = function () {
       errorMoreInfo.removeAttribute("hidden");
       moreInfoButton.setAttribute("hidden", "true");
       lessInfoButton.removeAttribute("hidden");
       errorMoreInfo.style.height = errorMoreInfo.scrollHeight + "px";
     };
-    lessInfoButton.onclick = function() {
+    lessInfoButton.onclick = function () {
       errorMoreInfo.setAttribute("hidden", "true");
       moreInfoButton.removeAttribute("hidden");
       lessInfoButton.setAttribute("hidden", "true");
     };
     moreInfoButton.removeAttribute("hidden");
     lessInfoButton.setAttribute("hidden", "true");
-    Promise.all(moreInfoText).then(function(parts) {
+    Promise.all(moreInfoText).then(function (parts) {
       errorMoreInfo.value = parts.join("\n");
     });
   },
@@ -369,29 +369,31 @@ var PDFViewerApplication = {
     });
     linkService.setHistory(this.pdfHistory);
 
-    document.getElementById("previous").addEventListener("click", function() {
+    document.getElementById("previous").addEventListener("click", function () {
       PDFViewerApplication.page--;
     });
 
-    document.getElementById("next").addEventListener("click", function() {
+    document.getElementById("next").addEventListener("click", function () {
       PDFViewerApplication.page++;
     });
 
-    document.getElementById("zoomIn").addEventListener("click", function() {
+    document.getElementById("zoomIn").addEventListener("click", function () {
       PDFViewerApplication.zoomIn();
     });
 
-    document.getElementById("zoomOut").addEventListener("click", function() {
+    document.getElementById("zoomOut").addEventListener("click", function () {
       PDFViewerApplication.zoomOut();
     });
 
-    document.getElementById("pageNumber").addEventListener("click", function() {
-      this.select();
-    });
+    document
+      .getElementById("pageNumber")
+      .addEventListener("click", function () {
+        this.select();
+      });
 
     document
       .getElementById("pageNumber")
-      .addEventListener("change", function() {
+      .addEventListener("change", function () {
         PDFViewerApplication.page = this.value | 0;
 
         // Ensure that the page number input displays the correct value,
@@ -402,14 +404,14 @@ var PDFViewerApplication = {
         }
       });
 
-    eventBus.on("pagesinit", function() {
+    eventBus.on("pagesinit", function () {
       // We can use pdfViewer now, e.g. let's change default scale.
       pdfViewer.currentScaleValue = DEFAULT_SCALE_VALUE;
     });
 
     eventBus.on(
       "pagechanging",
-      function(evt) {
+      function (evt) {
         var page = evt.pageNumber;
         var numPages = PDFViewerApplication.pagesCount;
 
@@ -424,7 +426,7 @@ var PDFViewerApplication = {
 
 document.addEventListener(
   "DOMContentLoaded",
-  function() {
+  function () {
     PDFViewerApplication.initUI();
   },
   true
@@ -433,13 +435,15 @@ document.addEventListener(
 (function animationStartedClosure() {
   // The offsetParent is not set until the PDF.js iframe or object is visible.
   // Waiting for first animation.
-  PDFViewerApplication.animationStartedPromise = new Promise(function(resolve) {
+  PDFViewerApplication.animationStartedPromise = new Promise(function (
+    resolve
+  ) {
     window.requestAnimationFrame(resolve);
   });
 })();
 
 // We need to delay opening until all HTML is loaded.
-PDFViewerApplication.animationStartedPromise.then(function() {
+PDFViewerApplication.animationStartedPromise.then(function () {
   PDFViewerApplication.open({
     url: DEFAULT_URL,
   });

examples/node/domstubs.js

@@ -58,7 +58,7 @@ function DOMElement(name) {
   if (name === "style") {
     this.sheet = {
       cssRules: [],
-      insertRule: function(rule) {
+      insertRule: function (rule) {
         this.cssRules.push(rule);
       },
     };
@@ -226,16 +226,16 @@ const document = {
     return this;
   },
 
-  createElementNS: function(NS, element) {
+  createElementNS: function (NS, element) {
     var elObject = new DOMElement(element);
     return elObject;
   },
 
-  createElement: function(element) {
+  createElement: function (element) {
     return this.createElementNS("", element);
   },
 
-  getElementsByTagName: function(element) {
+  getElementsByTagName: function (element) {
     if (element === "head") {
       return [this.head || (this.head = new DOMElement("head"))];
     }
@@ -264,14 +264,14 @@ exports.Image = Image;
 
 var exported_symbols = Object.keys(exports);
 
-exports.setStubs = function(namespace) {
-  exported_symbols.forEach(function(key) {
+exports.setStubs = function (namespace) {
+  exported_symbols.forEach(function (key) {
     console.assert(!(key in namespace), "property should not be set: " + key);
     namespace[key] = exports[key];
   });
 };
-exports.unsetStubs = function(namespace) {
-  exported_symbols.forEach(function(key) {
+exports.unsetStubs = function (namespace) {
+  exported_symbols.forEach(function (key) {
     console.assert(key in namespace, "property should be set: " + key);
     delete namespace[key];
   });