refactor: remove unused code

Author: mdjastrzebski

src/__tests__/timerUtils.ts

@@ -1,12 +1,7 @@
 import { setTimeout } from '../helpers/timers';
 
-const TimerMode = {
-  Legacy: 'legacy',
-  Modern: 'modern', // broken for now
-} as const;
-
 async function sleep(ms: number): Promise<void> {
   return new Promise((resolve) => setTimeout(resolve, ms));
 }
 
-export { TimerMode, sleep };
+export { sleep };

src/__tests__/waitFor.test.tsx

@@ -1,7 +1,6 @@
 import * as React from 'react';
 import { Text, TouchableOpacity, View } from 'react-native';
 import { fireEvent, render, waitFor } from '..';
-import { TimerMode } from './timerUtils';
 
 class Banana extends React.Component<any> {
   changeFresh = () => {

src/__tests__/waitForElementToBeRemoved.test.tsx

@@ -1,7 +1,6 @@
 import React, { useState } from 'react';
 import { View, Text, TouchableOpacity } from 'react-native';
 import { render, fireEvent, waitForElementToBeRemoved } from '..';
-import { TimerMode } from './timerUtils';
 
 const TestSetup = ({ shouldUseDelay = true }) => {
   const [isAdded, setIsAdded] = useState(true);