Convert react-native-github/Libraries to let/const

Reviewed By: sahrens

Differential Revision: D7956042

fbshipit-source-id: 221851aa311f3cdd6326497352b366048db0a1bb

Libraries/Utilities/differ/__tests__/deepDiffer-test.js

@@ -8,7 +8,7 @@
  */
 'use strict';
 
-var deepDiffer = require('deepDiffer');
+const deepDiffer = require('deepDiffer');
 
 describe('deepDiffer', function() {
   it('should diff primitives of the same type', () => {
@@ -95,7 +95,7 @@ describe('deepDiffer', function() {
     expect(deepDiffer(['a', 'b'], {length: 2, 0: 'a', 1: 'b'})).toBe(true);
   });
   it('should diff same object', () => {
-    var obj = [1,[2,3]];
+    const obj = [1,[2,3]];
     expect(deepDiffer(obj, obj)).toBe(false);
   });
   it('should respect maxDepth arg', () => {

Libraries/Utilities/differ/deepDiffer.js

@@ -11,7 +11,7 @@
 /*
  * @returns {bool} true if different, false if equal
  */
-var deepDiffer = function(one: any, two: any, maxDepth: number = -1): bool {
+const deepDiffer = function(one: any, two: any, maxDepth: number = -1): bool {
   if (maxDepth === 0) {
     return true;
   }
@@ -37,22 +37,22 @@ var deepDiffer = function(one: any, two: any, maxDepth: number = -1): bool {
   }
   if (Array.isArray(one)) {
     // We know two is also an array because the constructors are equal
-    var len = one.length;
+    const len = one.length;
     if (two.length !== len) {
       return true;
     }
-    for (var ii = 0; ii < len; ii++) {
+    for (let ii = 0; ii < len; ii++) {
       if (deepDiffer(one[ii], two[ii], maxDepth - 1)) {
         return true;
       }
     }
   } else {
-    for (var key in one) {
+    for (const key in one) {
       if (deepDiffer(one[key], two[key], maxDepth - 1)) {
         return true;
       }
     }
-    for (var twoKey in two) {
+    for (const twoKey in two) {
       // The only case we haven't checked yet is keys that are in two but aren't
       // in one, which means they are different.
       if (one[twoKey] === undefined && two[twoKey] !== undefined) {

Libraries/Utilities/differ/insetsDiffer.js

@@ -15,14 +15,14 @@ type Inset = {
   bottom: ?number,
 }
 
-var dummyInsets = {
+const dummyInsets = {
 	top: undefined,
 	left: undefined,
 	right: undefined,
 	bottom: undefined,
 };
 
-var insetsDiffer = function(
+const insetsDiffer = function(
   one: ?Inset,
   two: ?Inset
 ): bool {

Libraries/Utilities/differ/matricesDiffer.js

@@ -16,7 +16,7 @@
  * @param {MatrixMath.Matrix} two Second matrix.
  * @return {boolean} Whether or not the two matrices differ.
  */
-var matricesDiffer = function(one, two) {
+const matricesDiffer = function(one, two) {
   if (one === two) {
     return false;
   }

Libraries/Utilities/differ/pointsDiffer.js

@@ -13,9 +13,9 @@ type Point = {
   y: ?number,
 }
 
-var dummyPoint = {x: undefined, y: undefined};
+const dummyPoint = {x: undefined, y: undefined};
 
-var pointsDiffer = function(one: ?Point, two: ?Point): bool {
+const pointsDiffer = function(one: ?Point, two: ?Point): bool {
   one = one || dummyPoint;
   two = two || dummyPoint;
   return one !== two && (

Libraries/Utilities/differ/sizesDiffer.js

@@ -7,9 +7,9 @@
  */
 'use strict';
 
-var dummySize = {width: undefined, height: undefined};
+const dummySize = {width: undefined, height: undefined};
 
-var sizesDiffer = function(one, two) {
+const sizesDiffer = function(one, two) {
   one = one || dummySize;
   two = two || dummySize;
   return one !== two && (