Changing to file level use strict statement

lib/utils.js

@@ -1,4 +1,7 @@
+'use strict';
+
 /*global toString:true*/
+
 // utils is a library of generic helper functions non-specific to axios
 
 var toString = Object.prototype.toString;
@@ -10,7 +13,6 @@ var toString = Object.prototype.toString;
  * @returns {boolean} True if value is an Array, otherwise false
  */
 function isArray(val) {
-  'use strict';
   return toString.call(val) === '[object Array]';
 }
 
@@ -21,7 +23,6 @@ function isArray(val) {
  * @returns {boolean} True if value is an ArrayBuffer, otherwise false
  */
 function isArrayBuffer(val) {
-  'use strict';
   return toString.call(val) === '[object ArrayBuffer]';
 }
 
@@ -32,7 +33,6 @@ function isArrayBuffer(val) {
  * @returns {boolean} True if value is an FormData, otherwise false
  */
 function isFormData(val) {
-  'use strict';
   return toString.call(val) === '[object FormData]';
 }
 
@@ -43,7 +43,6 @@ function isFormData(val) {
  * @returns {boolean} True if value is a view on an ArrayBuffer, otherwise false
  */
 function isArrayBufferView(val) {
-  'use strict';
   if ((typeof ArrayBuffer !== 'undefined') && (ArrayBuffer.isView)) {
     return ArrayBuffer.isView(val);
   } else {
@@ -58,7 +57,6 @@ function isArrayBufferView(val) {
  * @returns {boolean} True if value is a String, otherwise false
  */
 function isString(val) {
-  'use strict';
   return typeof val === 'string';
 }
 
@@ -69,7 +67,6 @@ function isString(val) {
  * @returns {boolean} True if value is a Number, otherwise false
  */
 function isNumber(val) {
-  'use strict';
   return typeof val === 'number';
 }
 
@@ -80,7 +77,6 @@ function isNumber(val) {
  * @returns {boolean} True if the value is undefined, otherwise false
  */
 function isUndefined(val) {
-  'use strict';
   return typeof val === 'undefined';
 }
 
@@ -91,7 +87,6 @@ function isUndefined(val) {
  * @returns {boolean} True if value is an Object, otherwise false
  */
 function isObject(val) {
-  'use strict';
   return val !== null && typeof val === 'object';
 }
 
@@ -102,7 +97,6 @@ function isObject(val) {
  * @returns {boolean} True if value is a Date, otherwise false
  */
 function isDate(val) {
-  'use strict';
   return toString.call(val) === '[object Date]';
 }
 
@@ -113,7 +107,6 @@ function isDate(val) {
  * @returns {boolean} True if value is a File, otherwise false
  */
 function isFile(val) {
-  'use strict';
   return toString.call(val) === '[object File]';
 }
 
@@ -124,7 +117,6 @@ function isFile(val) {
  * @returns {boolean} True if value is a Blob, otherwise false
  */
 function isBlob(val) {
-  'use strict';
   return toString.call(val) === '[object Blob]';
 }
 
@@ -135,7 +127,6 @@ function isBlob(val) {
  * @returns {String} The String freed of excess whitespace
  */
 function trim(str) {
-  'use strict';
   return str.replace(/^\s*/, '').replace(/\s*$/, '');
 }
 
@@ -152,7 +143,6 @@ function trim(str) {
  * @param {Function} fn The callback to invoke for each item
  */
 function forEach(obj, fn) {
-  'use strict';
   // Don't bother if no value provided
   if (obj === null || typeof obj === 'undefined') {
     return;
@@ -200,7 +190,6 @@ function forEach(obj, fn) {
  * @returns {Object} Result of all merge properties
  */
 function merge(/*obj1, obj2, obj3, ...*/) {
-  'use strict';
   var result = {};
   forEach(arguments, function (obj) {
     forEach(obj, function (val, key) {