diff --git a/src/shared/util.js b/src/shared/util.js
index 94835c611..87367edb6 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -21,7 +21,7 @@
 
 var globalScope = (typeof window === 'undefined') ? this : window;
 
-var isWorker = (typeof window == 'undefined');
+var isWorker = (typeof window === 'undefined');
 
 var FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];
 
@@ -272,7 +272,7 @@ function combineUrl(baseUrl, url) {
     return url;
   }
   var i;
-  if (url.charAt(0) == '/') {
+  if (url.charAt(0) === '/') {
     // absolute path
     i = baseUrl.indexOf('://');
     if (url.charAt(1) === '/') {
@@ -946,7 +946,7 @@ function isEmptyObj(obj) {
 }
 
 function isBool(v) {
-  return typeof v == 'boolean';
+  return typeof v === 'boolean';
 }
 
 function isInt(v) {
@@ -1099,7 +1099,7 @@ PDFJS.createPromiseCapability = createPromiseCapability;
     pendingRejectionCheck: false,
 
     scheduleHandlers: function scheduleHandlers(promise) {
-      if (promise._status == STATUS_PENDING) {
+      if (promise._status === STATUS_PENDING) {
         return;
       }
 
@@ -1125,10 +1125,10 @@ PDFJS.createPromiseCapability = createPromiseCapability;
 
         try {
           if (nextStatus === STATUS_RESOLVED) {
-            if (typeof(handler.onResolve) == 'function') {
+            if (typeof handler.onResolve === 'function') {
               nextValue = handler.onResolve(nextValue);
             }
-          } else if (typeof(handler.onReject) === 'function') {
+          } else if (typeof handler.onReject === 'function') {
               nextValue = handler.onReject(nextValue);
               nextStatus = STATUS_RESOLVED;
 
@@ -1295,7 +1295,7 @@ PDFJS.createPromiseCapability = createPromiseCapability;
         return;
       }
 
-      if (status == STATUS_RESOLVED &&
+      if (status === STATUS_RESOLVED &&
           Promise.isPromise(value)) {
         value.then(this._updateStatus.bind(this, STATUS_RESOLVED),
                    this._updateStatus.bind(this, STATUS_REJECTED));