Delete App.js

-import React, {Fragment, useState} from "react";
-import { Client } from "elasticsearch"
-import "./App.css";
-
-function App() {
-
-  const [answer, setAnswer] = useState('');
-  const [inputValue, setInputValue] = useState('');
-
-  const client = new Client({
-    host: 'http://localhost:9200'
-  });
-
-  const onKeyUpHandler = async (event) => {
-    if (event.charCode === 13) {
-      setInputValue(event.target.value);
-
-      if (inputValue !== '' || inputValue !== undefined || inputValue.length !== 0) {
-        console.log(inputValue);
-        try {
-          const result = await client.search({
-            index: "wiki-qna2",
-            body: {
-              query: {
-                match: {
-                  "질문(원문, 하 난이도)": inputValue
-                }
-              }
-            }
-          });
-
-          if (result !== null || result !== undefined || result.length !== 0) {
-            setAnswer(result.hits.hits);
-          }
-        } catch (error) {
-          console.log(error);
-        }
-      }
-    }
-  }
-
-  const showAnswer = (answer) => {
-    return (
-        <div>
-          <b>{answer !== undefined ? answer._source.정답 : 'loading ....'}</b>
-        </div>
-    )
-  }
-
-  return (
-      <div className="App">
-        <header className="App-header">
-          <Fragment>
-            Ask a Question
-            <input size="80" onKeyPress={onKeyUpHandler}/>
-            <div>
-            -- Answers --
-              <div>
-                {answer === '' ? " loading answer..." : showAnswer(answer[0])}
-              </div>
-            </div>
-          </Fragment>
-        </header>
-      </div>
-  );
-}
-
-export default App;