Syntax changed that will help minifiers/compilers (such as the Closure Compiler) in their processing. In particular, preventing said minifiers/compilers from making dangerous renames.

src/api.js

@@ -345,8 +345,9 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
       var length = this.operatorList.fnArray.length;
       var operatorList = this.operatorList;
       var stepper = null;
-      if (PDFJS.pdfBug && StepperManager.enabled) {
+      if (PDFJS.pdfBug && 'StepperManager' in globalScope &&
-        stepper = StepperManager.create(this.pageNumber - 1);
+          globalScope['StepperManager'].enabled) {
+        stepper = globalScope['StepperManager'].create(this.pageNumber - 1);
         stepper.init(operatorList);
         stepper.nextBreakPoint = stepper.getNextBreakPoint();
       }

src/fonts.js

@@ -3141,8 +3141,9 @@ var Font = (function FontClosure() {
       var styleSheet = styleElement.sheet;
       styleSheet.insertRule(rule, styleSheet.cssRules.length);
 
-      if (PDFJS.pdfBug && FontInspector.enabled)
+      if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
-        FontInspector.fontAdded(this, url);
+          globalScope['FontInspector'].enabled)
+        globalScope['FontInspector'].fontAdded(this, url);
 
       return rule;
     },

src/jpx.js

@@ -255,7 +255,7 @@ var JpxImage = (function JpxImageClosure() {
                   cod.resetContextProbabilities ||
                   cod.terminationOnEachCodingPass ||
                   cod.verticalyStripe || cod.predictableTermination)
-                throw 'Unsupported COD options: ' + uneval(cod);
+                throw 'Unsupported COD options: ' + globalScope.JSON.stringify(cod);
 
               if (context.mainHeader)
                 context.COD = cod;

src/util.js

@@ -5,12 +5,16 @@
 
 // Use only for debugging purposes. This should not be used in any code that is
 // in mozilla master.
-function log(msg) {
+var log = (function() {
-  if (console && console.log)
+  if ('console' in globalScope && 'log' in globalScope['console']) {
-    console.log(msg);
+    return globalScope['console']['log'].bind(globalScope['console']);
-  else if (print)
+  } else if ('print' in globalScope) {
-    print(msg);
+    return globalScope['print'].bind(globalScope);
-}
+  } else {
+    return function nop() {
+    };
+  }
+})();
 
 // A notice for devs that will not trigger the fallback UI.  These are good
 // for things that are helpful to devs, such as warning that Workers were
@@ -33,7 +37,16 @@ function warn(msg) {
 // Fatal errors that should trigger the fallback UI and halt execution by
 // throwing an exception.
 function error(msg) {
-  log('Error: ' + msg);
+  // If multiple arguments were passed, pass them all to the log function.
+  if (arguments.length > 1) {
+    var logArguments = ['Error:'];
+    logArguments.push.apply(logArguments, arguments);
+    log.apply(null, logArguments);
+    // Join the arguments into a single string for the lines below.
+    msg = [].join.call(arguments, ' ');
+  } else {
+    log('Error: ' + msg);
+  }
   log(backtrace());
   PDFJS.LogManager.notify('error', msg);
   throw new Error(msg);

src/worker.js

@@ -11,11 +11,17 @@ function MessageHandler(name, comObj) {
   var ah = this.actionHandler = {};
 
   ah['console_log'] = [function ahConsoleLog(data) {
-    console.log.apply(console, data);
+    log.apply(null, data);
-  }];
-  ah['console_error'] = [function ahConsoleError(data) {
-    console.error.apply(console, data);
   }];
+  // If there's no console available, console_error in the action handler will do nothing.
+  if ('console' in globalScope) {
+    ah['console_error'] = [function ahConsoleError(data) {
+      globalScope['console'].error.apply(null, data);
+    }];
+  } else {
+    ah['console_error'] = [function ahConsoleError(data) {
+    }];
+  }
   ah['_warn'] = [function ah_Warn(data) {
     warn(data);
   }];
@@ -263,7 +269,7 @@ var consoleTimer = {};
 var workerConsole = {
   log: function log() {
     var args = Array.prototype.slice.call(arguments);
-    postMessage({
+    globalScope.postMessage({
       action: 'console_log',
       data: args
     });
@@ -271,7 +277,7 @@ var workerConsole = {
 
   error: function error() {
     var args = Array.prototype.slice.call(arguments);
-    postMessage({
+    globalScope.postMessage({
       action: 'console_error',
       data: args
     });
@@ -299,7 +305,7 @@ if (typeof window === 'undefined') {
   // throw an exception which will be forwarded on automatically.
   PDFJS.LogManager.addLogger({
     warn: function(msg) {
-      postMessage({
+      globalScope.postMessage({
         action: '_warn',
         data: msg
       });