Use blocked scoped variables

In addition to using const and let, this also upgrades our linter config and removes lint (mostly whitespace).

test/spec/ol/events/event.test.js

@@ -4,30 +4,30 @@ describe('ol.events.Event', function() {
 
   describe('constructor', function() {
     it('takes a type as argument', function() {
-      var event = new Event('foo');
+      const event = new Event('foo');
       expect(event.type).to.be('foo');
     });
     it('does not set the propagationStopped flag', function() {
-      var event = new Event('foo');
+      const event = new Event('foo');
       expect(event.propagationStopped).to.be(undefined);
     });
   });
 
   describe('#preventDefault', function() {
     it('sets the propagationStopped flag', function() {
-      var event = new Event('foo');
+      const event = new Event('foo');
       event.preventDefault();
       expect(event.propagationStopped).to.be(true);
     });
     it('is the same as #stopPropagation', function() {
-      var event = new Event('foo');
+      const event = new Event('foo');
       expect(event.stopPropagation).to.equal(event.preventDefault);
     });
   });
 
   describe('ol.events.Event.preventDefault', function() {
     it('calls preventDefault on the event object', function() {
-      var event = {
+      const event = {
         preventDefault: sinon.spy()
       };
       Event.preventDefault(event);
@@ -37,7 +37,7 @@ describe('ol.events.Event', function() {
 
   describe('ol.events.Event.stopPropagation', function() {
     it('calls preventDefault on the event object', function() {
-      var event = {
+      const event = {
         stopPropagation: sinon.spy()
       };
       Event.stopPropagation(event);

test/spec/ol/events/eventtarget.test.js

@@ -5,7 +5,7 @@ import EventTarget from '../../../../src/ol/events/EventTarget.js';
 
 
 describe('ol.events.EventTarget', function() {
-  var called, events, eventTarget, spy1, spy2, spy3;
+  let called, events, eventTarget, spy1, spy2, spy3;
 
   beforeEach(function() {
     called = [];
@@ -46,7 +46,7 @@ describe('ol.events.EventTarget', function() {
   describe('#getListeners', function() {
     it('returns listeners for a type or undefined if none', function() {
       expect(eventTarget.getListeners('foo')).to.be(undefined);
-      var listeners = [function() {}];
+      const listeners = [function() {}];
       eventTarget.listeners_['foo'] = listeners;
       expect(eventTarget.getListeners('foo')).to.equal(listeners);
     });
@@ -111,7 +111,7 @@ describe('ol.events.EventTarget', function() {
     });
     it('passes a custom event object with target to listeners', function() {
       eventTarget.addEventListener('foo', spy1);
-      var event = {
+      const event = {
         type: 'foo'
       };
       eventTarget.dispatchEvent(event);