diff --git a/js/dom_types.ts b/js/dom_types.ts
index 71881773d8..75f683be5b 100644
--- a/js/dom_types.ts
+++ b/js/dom_types.ts
@@ -296,8 +296,8 @@ export interface Headers {
   append(name: string, value: string): void;
   /** Deletes a header from a `Headers` object. */
   delete(name: string): void;
-  /** Returns an iterator allowing to go through all key/value pairs 
-   * contained in this Headers object. The both the key and value of each pairs 
+  /** Returns an iterator allowing to go through all key/value pairs
+   * contained in this Headers object. The both the key and value of each pairs
    * are ByteString objects.
    */
   entries(): IterableIterator<[string, string]>;
@@ -309,7 +309,7 @@ export interface Headers {
    * header.
    */
   has(name: string): boolean;
-  /** Returns an iterator allowing to go through all keys contained in 
+  /** Returns an iterator allowing to go through all keys contained in
    * this Headers object. The keys are ByteString objects.
    */
   keys(): IterableIterator<string>;
@@ -317,7 +317,7 @@ export interface Headers {
    * the header if it does not already exist.
    */
   set(name: string, value: string): void;
-  /** Returns an iterator allowing to go through all values contained in 
+  /** Returns an iterator allowing to go through all values contained in
    * this Headers object. The values are ByteString objects.
    */
   values(): IterableIterator<string>;
@@ -326,7 +326,7 @@ export interface Headers {
     // tslint:disable-next-line:no-any
     thisArg?: any
   ): void;
-  /** The Symbol.iterator well-known symbol specifies the default 
+  /** The Symbol.iterator well-known symbol specifies the default
    * iterator for this Headers object
    */
   [Symbol.iterator](): IterableIterator<[string, string]>;
diff --git a/js/fetch.ts b/js/fetch.ts
index eef149e4d5..3559f3db84 100644
--- a/js/fetch.ts
+++ b/js/fetch.ts
@@ -89,7 +89,7 @@ export class DenoHeaders implements domTypes.Headers {
 
   keys(): IterableIterator<string> {
     const iterators = this.headerMap.keys();
-    return new CreateIterableIterator(iterators); 
+    return new CreateIterableIterator(iterators);
   }
 
   set(name: string, value: string): void {
@@ -99,7 +99,7 @@ export class DenoHeaders implements domTypes.Headers {
 
   values(): IterableIterator<string> {
     const iterators = this.headerMap.values();
-    return new CreateIterableIterator(iterators); 
+    return new CreateIterableIterator(iterators);
   }
 
   forEach(
diff --git a/js/util.ts b/js/util.ts
index 0d2049842c..fbd461bbe8 100644
--- a/js/util.ts
+++ b/js/util.ts
@@ -138,7 +138,7 @@ export class CreateIterableIterator<T> implements IterableIterator<T> {
 
   [Symbol.iterator](): IterableIterator<T> {
     return this;
-  }  
+  }
 
   next(): IteratorResult<T> {
     return this._iterators.next();
diff --git a/js/util_test.ts b/js/util_test.ts
index b7111fd0de..0ca2f4433d 100644
--- a/js/util_test.ts
+++ b/js/util_test.ts
@@ -23,4 +23,4 @@ test(function CreateIterableIteratorSuccess() {
     assert(key in obj);
     assertEqual(value, obj[key]);
   }
-});
\ No newline at end of file
+});