Download the SimpleTimer Library before uploading the code on to the ESP32.

Link for the Library

#include<WiFi.h>
#include<SimpleTimer.h>

const int ledPin = 13;
const int ldrPin = 34; //same side of the ESP32

SimpleTimer timer;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(ledPin,OUTPUT);
  pinMode(ldrPin,INPUT);
  timer.setInterval(2000,readSensor);
}

void loop() {
  // put your main code here, to run repeatedly:
  timer.run();

}

void toggleLED(){
  digitalWrite(ledPin, !digitalRead(ledPin));
  //HIGH --> LOW
  //LOW  --> HIGH
}

void readSensor(){
  //read the sensor
  int ldrValue = analogRead(ldrPin);
  Serial.print("Sensor Reading :");
  Serial.println(ldrValue);
  
  //set the threshold
  int threshold = 1200;

  //if sensor reading is greater than turn off the LED
  if (ldrValue> threshold){
    digitalWrite(ledPin,LOW);
    Serial.println("LOW");
  }
  else{
    digitalWrite(ledPin,HIGH);
    Serial.println("HIGH");
  }
  
  
}