A night light in Javascript

night-light.js

var interval = 1000
var isLedOn = false
var lightThreshold = 0.7

// Initilize the LED to be off
digitalWrite(D5, false)

setInterval(function() {
    console.log("Light Level: " + analogRead())

    // Read Photo Cell from A0
    var lightLevel = analogRead()

    if (lightLevel < lightThreshold && !isLedOn) {
        console.log("It's Dark. Turning light on")
        digitalWrite(D5, true) // Send HIGH to D1 on the NodeMCU
        isLedOn = true
    }
    if (lightLevel > lightThreshold && isLedOn) {
        console.log("It's Light. Turning light off")
        digitalWrite(D5, false) // Send LOW to D1 on the NodeMCU
        isLedOn = false
    }
}, interval)