Scala，PureConfig -如何读取json配置文件？

libraryDependencies += "com.github.pureconfig" %% "pureconfig" % "0.17.0"
libraryDependencies += "com.github.pureconfig" %% "pureconfig-cats-effect" % "0.17.0" // 如果需要支持cats-effect

{
  "app": {
    "name": "MyApp",
    "version": "1.0",
    "debug": true
  },
  "database": {
    "url": "jdbc:mysql://localhost:3306/mydb",
    "username": "root",
    "password": "password"
  }
}

import pureconfig.ConfigReader
import pureconfig.generic.semiauto._

case class AppConfig(app: AppInfo, database: DatabaseInfo)
case class AppInfo(name: String, version: String, debug: Boolean)
case class DatabaseInfo(url: String, username: String, password: String)

object AppConfig {
  implicit val appConfigReader: ConfigReader[AppConfig] = deriveReader[AppConfig]
  implicit val appInfoReader: ConfigReader[AppInfo] = deriveReader[AppInfo]
  implicit val databaseInfoReader: ConfigReader[DatabaseInfo] = deriveReader[DatabaseInfo]
}

import pureconfig._
import pureconfig.generic.auto._

val config = ConfigSource.file("appConfig.json").load[AppConfig]