Proper way to create connection to db in Typeorm - Nodejs

I'm newbie to typeorm and trying to create a connection to db. I read the typeorm's doc and found this code, it uses DataSource to create connection:

import "reflect-metadata"
import { DataSource } from "typeorm"
import { Photo } from "./entity/Photo"

const AppDataSource = new DataSource({
    type: "postgres",
    host: "localhost",
    port: 5432,
    username: "root",
    password: "admin",
    database: "test",
    entities: [Photo],
    synchronize: true,
    logging: false,
})

AppDataSource.initialize()
    .then(() => {
        // here you can start to work with your database
    })
    .catch((error) => console.log(error))

But when searching for some references in other sources, they use createConnection instead:

import { createConnection } from "typeorm"

createConnection({
  type: "mysql",
  host: "localhost",
  port: 3306,
  username: "root",
  password: "mysql",
  database: "mysql",
  entities: [
     __dirname + "/entity/*.ts"
  ],
  synchronize: true,
  logging: false
}).then(async connection => {
…
…
}).catch(error => console.log(error));

I'm a bit confused. What approach should I use for creating connection to db between those two above?

For the next person that comes across this issue, createConnection has been deprecated in favor of using new DataSource. See here:

https://typeorm.io/changelog#030httpsgithubcomtypeormtypeormpull8616-2022-03-17