Cleaning up core axios a bit

lib/helpers/deprecatedMethod.js

@@ -0,0 +1,22 @@
+'use strict';
+
+/**
+ * Supply a warning to the developer that a method they are using
+ * has been deprecated.
+ *
+ * @param {string} method The name of the deprecated method
+ * @param {string} [instead] The alternate method to use if applicable
+ * @param {string} [docs] The documentation URL to get further details
+ */
+module.exports = function deprecatedMethod(method, instead, docs) {
+  try {
+    console.warn(
+      'DEPRECATED method `' + method + '`.' +
+      (instead ? ' Use `' + instead + '` instead.' : '') +
+      ' This method will be removed in a future release.');
+
+    if (docs) {
+      console.warn('For more information about usage see ' + docs);
+    }
+  } catch (e) {}
+};