Changing to file level use strict statement

.eslintrc

@@ -5,7 +5,8 @@
     "require": true
   },
   "env": {
-    "browser": true
+    "browser": true,
+    "node": true
   },
   "rules": {
     "quotes": "single"

lib/adapters/http.js

+'use strict';
+
 var defaults = require('./../defaults');
 var utils = require('./../utils');
 var buildUrl = require('./../helpers/buildUrl');
@@ -9,8 +11,6 @@ var pkg = require('./../../package.json');
 var Buffer = require('buffer').Buffer;
 
 module.exports = function httpAdapter(resolve, reject, config) {
-  'use strict';
-
   // Transform request data
   var data = transformData(
     config.data,

lib/adapters/xhr.js

+'use strict';
+
 /*global ActiveXObject:true*/
 
 var defaults = require('./../defaults');
@@ -9,8 +11,6 @@ var transformData = require('./../helpers/transformData');
 var urlIsSameOrigin = require('./../helpers/urlIsSameOrigin');
 
 module.exports = function xhrAdapter(resolve, reject, config) {
-  'use strict';
-
   // Transform request data
   var data = transformData(
     config.data,

lib/axios.js

+'use strict';
+
 var defaults = require('./defaults');
 var utils = require('./utils');
 var deprecatedMethod = require('./helpers/deprecatedMethod');
@@ -6,8 +8,6 @@ var InterceptorManager = require('./core/InterceptorManager');
 
 // Polyfill ES6 Promise if needed
 (function () {
-  'use strict';
-
   // webpack is being used to set es6-promise to the native Promise
   // for the standalone build. It's necessary to make sure polyfill exists.
   var P = require('es6-promise');
@@ -17,8 +17,6 @@ var InterceptorManager = require('./core/InterceptorManager');
 })();
 
 var axios = module.exports = function axios(config) {
-  'use strict';
-
   config = utils.merge({
     method: 'get',
     headers: {},
@@ -73,7 +71,6 @@ axios.defaults = defaults;
 
 // Expose all/spread
 axios.all = function (promises) {
-  'use strict';
   return Promise.all(promises);
 };
 axios.spread = require('./helpers/spread');
@@ -86,8 +83,6 @@ axios.interceptors = {
 
 // Provide aliases for supported request methods
 (function () {
-  'use strict';
-
   function createShortMethods() {
     utils.forEach(arguments, function (method) {
       axios[method] = function (url, config) {

lib/core/InterceptorManager.js

+'use strict';
+
 var utils = require('./../utils');
 
 function InterceptorManager() {
-  'use strict';
   this.handlers = [];
 }
 
@@ -14,7 +15,6 @@ function InterceptorManager() {
  * @return {Number} An ID used to remove interceptor later
  */
 InterceptorManager.prototype.use = function (fulfilled, rejected) {
-  'use strict';
   this.handlers.push({
     fulfilled: fulfilled,
     rejected: rejected
@@ -28,7 +28,6 @@ InterceptorManager.prototype.use = function (fulfilled, rejected) {
  * @param {Number} id The ID that was returned by `use`
  */
 InterceptorManager.prototype.eject = function (id) {
-  'use strict';
   if (this.handlers[id]) {
     this.handlers[id] = null;
   }
@@ -43,7 +42,6 @@ InterceptorManager.prototype.eject = function (id) {
  * @param {Function} fn The function to call for each interceptor
  */
 InterceptorManager.prototype.forEach = function (fn) {
-  'use strict';
   utils.forEach(this.handlers, function (h) {
     if (h !== null) {
       fn(h);

lib/core/dispatchRequest.js

+'use strict';
+
 /**
  * Dispatch a request to the server using whichever adapter
  * is supported by the current environment.

lib/defaults.js

+'use strict';
+
 var utils = require('./utils');
 
 var JSON_START = /^\s*(\[|\{[^\{])/;
@@ -9,7 +11,6 @@ var DEFAULT_CONTENT_TYPE = {
 
 module.exports = {
   transformRequest: [function (data, headers) {
-    'use strict';
     if (utils.isArrayBuffer(data)) {
       return data;
     }
@@ -27,7 +28,6 @@ module.exports = {
   }],
 
   transformResponse: [function (data) {
-    'use strict';
     if (typeof data === 'string') {
       data = data.replace(PROTECTION_PREFIX, '');
       if (JSON_START.test(data) && JSON_END.test(data)) {

lib/helpers/buildUrl.js

+'use strict';
+
 var utils = require('./../utils');
 
 function encode(val) {
-  'use strict';
   return encodeURIComponent(val).
     replace(/%40/gi, '@').
     replace(/%3A/gi, ':').
@@ -18,7 +19,6 @@ function encode(val) {
  * @returns {string} The formatted url
  */
 module.exports = function buildUrl(url, params) {
-  'use strict';
   if (!params) {
     return url;
   }

lib/helpers/cookies.js

+'use strict';
+
 var utils = require('./../utils');
 
 module.exports = {
   write: function write(name, value, expires, path, domain, secure) {
-    'use strict';
     var cookie = [];
     cookie.push(name + '=' + encodeURIComponent(value));
 
@@ -26,13 +27,11 @@ module.exports = {
   },
 
   read: function read(name) {
-    'use strict';
     var match = document.cookie.match(new RegExp('(^|;\\s*)(' + name + ')=([^;]*)'));
     return (match ? decodeURIComponent(match[3]) : null);
   },
 
   remove: function remove(name) {
-    'use strict';
     this.write(name, '', Date.now() - 86400000);
   }
 };

lib/helpers/deprecatedMethod.js

+'use strict';
+
 /**
  * Supply a warning to the developer that a method they are using
  * has been deprecated.
@@ -7,9 +9,6 @@
  * @param {string} [docs] The documentation URL to get further details
  */
 module.exports = function deprecatedMethod(method, instead, docs) {
-  /*eslint-env node*/
-  'use strict';
-
   try {
     console.warn(
       'DEPRECATED method `' + method + '`.' +

lib/helpers/parseHeaders.js

+'use strict';
+
 var utils = require('./../utils');
 
 /**
@@ -14,7 +16,6 @@ var utils = require('./../utils');
  * @returns {Object} Headers parsed into an object
  */
 module.exports = function parseHeaders(headers) {
-  'use strict';
   var parsed = {}, key, val, i;
 
   if (!headers) { return parsed; }

lib/helpers/spread.js

+'use strict';
+
 /**
  * Syntactic sugar for invoking a function and expanding an array for arguments.
  *
@@ -19,7 +21,6 @@
  * @returns {Function}
  */
 module.exports = function spread(callback) {
-  'use strict';
   return function (arr) {
     callback.apply(null, arr);
   };

lib/helpers/transformData.js

+'use strict';
+
 var utils = require('./../utils');
 
 /**
@@ -9,7 +11,6 @@ var utils = require('./../utils');
  * @returns {*} The resulting transformed data
  */
 module.exports = function transformData(data, headers, fns) {
-  'use strict';
   utils.forEach(fns, function (fn) {
     data = fn(data, headers);
   });

lib/helpers/urlIsSameOrigin.js

+'use strict';
+
 var utils = require('./../utils');
 var msie = /(msie|trident)/i.test(navigator.userAgent);
 var urlParsingNode = document.createElement('a');
@@ -10,7 +12,6 @@ var originUrl;
  * @returns {Object}
  */
 function urlResolve(url) {
-  'use strict';
   var href = url;
 
   if (msie) {
@@ -45,7 +46,6 @@ originUrl = urlResolve(window.location.href);
  * @returns {boolean} True if URL shares the same origin, otherwise false
  */
 module.exports = function urlIsSameOrigin(requestUrl) {
-  'use strict';
   var parsed = (utils.isString(requestUrl)) ? urlResolve(requestUrl) : requestUrl;
   return (parsed.protocol === originUrl.protocol &&
         parsed.host === originUrl.host);

lib/utils.js

+'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) {