Added custom transform function support alongside uppercase and lowercase

Added tests to an upcoming functionality
Fixed several lint issues manually
Added "lint:fix" npm script
Made it available to use 'uppercase' or  'lowercase' alongside custom transform function & applied several tests editions

src/mask.js

@@ -69,7 +69,7 @@ function process (value, mask, tokens, masked = true) {
     }
   }
 
-  // fix mask that ends with parentesis
+  // fix mask that ends with parenthesis
   while (masked && im < mask.length) { // eslint-disable-line no-unmodified-loop-condition
     const maskCharRest = mask[im]
     if (tokens[maskCharRest]) {
@@ -83,7 +83,16 @@ function process (value, mask, tokens, masked = true) {
   return ret + rest
 }
 
+/**
+ *
+ * @param {String} value
+ * @param {'uppercase' | 'lowercase' | 'transform'} token
+ */
 function tokenTransform (value, token) {
+  if (token.transform) {
+    value = token.transform(value)
+  }
+
   if (token.uppercase) {
     return value.toLocaleUpperCase()
   } else if (token.lowercase) {

src/utils.js

@@ -19,7 +19,7 @@ function fixInputSelection (el, position, digit) {
     position++
   }
 
-  const selectionRange = (el.type && el.type.match(/^(text|search|password|tel|url)$/i) || !el.type)
+  const selectionRange = el.type ? el.type.match(/^(text|search|password|tel|url)$/i) : !el.type
   if (selectionRange && el === document.activeElement) {
     el.setSelectionRange(position, position)
     setTimeout(function () {
@@ -32,4 +32,9 @@ function isString (val) {
   return Object.prototype.toString.call(val) === '[object String]'
 }
 
-export { event, findInputElement, fixInputSelection, isString }
+export {
+  event,
+  findInputElement,
+  fixInputSelection,
+  isString
+}