Fix Issue 684: Replace var with const, let in filer/tests/spec/filer.buffer.spec.js (#697)

* refactored code in tests/spec/filer.buffer.spec.js

* reverted changes to package-lock.json which shouldn't have been changed

* updated package-lock.json

* trying to fix bug

* roll back changes to package-lock.json, change lets to consts in filer.buffer.spec.js, added new line at the end of filer.buffer.spec.js

tests/spec/filer.buffer.spec.js

@@ -1,5 +1,7 @@
-var Filer = require('../../src');
+'use strict';
-var expect = require('chai').expect;
+
+const Filer = require('../../src');
+const expect = require('chai').expect;
 
 describe('Filer.Buffer', function() {
 
@@ -12,37 +14,37 @@ describe('Filer.Buffer', function() {
   });
 
   it('should support .isBuffer()', function() {
-    var buf = Buffer.alloc(0);
+    const buf = Buffer.alloc(0);
     expect(Buffer.isBuffer(buf)).to.be.true;
   });
 
   describe('Deprecation checks - constructor vs. class method init', function() {
 
     it('should allow new Buffer(array)', function() {
-      var arr = [1, 2, 3];
+      const arr = [1, 2, 3];
-      var buf1 = new Buffer(arr);
+      const buf1 = new Buffer(arr);
-      var buf2 = new Buffer.from(arr);
+      const buf2 = new Buffer.from(arr);
       expect(buf1).to.deep.equal(buf2);
     });
 
     it('should allow new Buffer(ArrayBuffer)', function() {
-      var arrayBuffer = (new Uint8Array([1, 2, 3])).buffer;
+      const arrayBuffer = (new Uint8Array([1, 2, 3])).buffer;
-      var buf1 = new Buffer(arrayBuffer);
+      const buf1 = new Buffer(arrayBuffer);
-      var buf2 = Buffer.from(arrayBuffer);
+      const buf2 = Buffer.from(arrayBuffer);
       expect(buf1).to.deep.equal(buf2);
     });
 
     it('should allow new Buffer(ArrayBuffer)', function() {
-      var buffer = new Buffer.from([1, 2, 3]);
+      const buffer = new Buffer.from([1, 2, 3]);
-      var buf1 = new Buffer(buffer);
+      const buf1 = new Buffer(buffer);
-      var buf2 = Buffer.from(buffer);
+      const buf2 = Buffer.from(buffer);
       expect(buf1).to.deep.equal(buf2);
     });
 
     it('should allow new Buffer(string)', function() {
-      var s = 'Hello World';
+      const s = 'Hello World';
-      var buf1 = new Buffer(s);
+      const buf1 = new Buffer(s);
-      var buf2 = Buffer.from(s);
+      const buf2 = Buffer.from(s);
       expect(buf1).to.deep.equal(buf2);
     });
   });