fixed issue not importing several functions and classes

Author: mientjan

lib/util/groupTextTokens.js

@@ -1,3 +1,6 @@
+import getIsTextType from './getIsTextType';
+import Token from "./Token";
+
 class Stack {
   constructor() {
     this.data = [];
@@ -36,13 +39,13 @@ export default function groupTextTokens(tokens) {
       }
     } else {
       if (currentStack.count > 1) {
-        result.push(createToken('textgroup', 1));
+        result.push(new Token('textgroup', 1));
 
         while (currentStack.data.length) {
           result.push(currentStack.data.shift());
         }
 
-        result.push(createToken('textgroup', -1));
+        result.push(new Token('textgroup', -1));
       } else if (currentStack.count === 1) {
         while (currentStack.data.length) {
           result.push(currentStack.data.shift());