Apollo=Express GraphQL error, cannot find module graphql - express

Question

I am trying to set up a graphql express server with apollo, express, typeorm, and graphql, however I am getting this error now that I have implemented the UserResolver.ts file. I have already tried installing graphql and even have downgraded it to 14.2.1 but it still doesn't work. Here is the source code:
index.ts
import "reflect-metadata";
import express from 'express';
import {ApolloServer} from 'apollo-server-express';
import { buildSchema } from "type-graphql";
import { UserResolver } from "./UserResolver";
(async () => {
const app = express();
app.get('/', (_req, res) => res.send('hello'))
const apolloServer = new ApolloServer({
schema: await buildSchema({
resolvers: [UserResolver]
})
});
// my line idk if it works
await apolloServer.start();
apolloServer.applyMiddleware({ app });
app.listen(4000, () => {
console.log("express server started");
});
})()
// createConnection().then(async connection => {
// console.log("Inserting a new user into the database...");
// const user = new User();
// user.firstName = "Timber";
// user.lastName = "Saw";
// user.age = 25;
// await connection.manager.save(user);
// console.log("Saved a new user with id: " + user.id);
// console.log("Loading users from the database...");
// const users = await connection.manager.find(User);
// console.log("Loaded users: ", users);
// console.log("Here you can setup and run express/koa/any other framework.");
// }).catch(error => console.log(error));
UserResolver.ts
import { Query, Resolver } from 'type-graphql';
#Resolver()
export class UserResolver{
#Query(() => String)
hello(){
return "hi";
}
}
ormconfig.json
{
"type": "postgres",
"host": "localhost",
"port": 5432,
"username": "postgres",
"password": "7434006a",
"database": "graphqldatabase",
"synchronize": true,
"logging": false,
"entities": [
"src/entity/**/*.ts"
],
"migrations": [
"src/migration/**/*.ts"
],
"subscribers": [
"src/subscriber/**/*.ts"
],
"cli": {
"entitiesDir": "src/entity",
"migrationsDir": "src/migration",
"subscribersDir": "src/subscriber"
}
}
package.json
{
"name": "backend",
"version": "0.0.1",
"description": "Awesome project developed with TypeORM.",
"devDependencies": {
"#types/express": "^4.17.13",
"#types/graphql": "^14.5.0",
"#types/node": "^8.0.29",
"ts-node": "3.3.0",
"typescript": "3.3.3333"
},
"dependencies": {
"#nestjs/common": "^8.2.3",
"#nestjs/core": "^8.2.3",
"#nestjs/typeorm": "^8.0.2",
"apollo-server-express": "^3.5.0",
"express": "^4.17.1",
"graphql": "^14.2.1",
"pg": "^8.4.0",
"reflect-metadata": "^0.1.10",
"rxjs": "^7.4.0",
"typeorm": "0.2.41"
},
"scripts": {
"start": "ts-node src/index.ts",
"typeorm": "node --require ts-node/register ./node_modules/typeorm/cli.js --config src/config/postgres.config.ts"
}
}