A simple, configurable countdown timer for Airtable.

countdownTimer.js

// Setup
const timerOptions = ["30", "45", "60"]

// Functions
function showTime(seconds) {
    const min = Math.floor(seconds / 60)
    const sec = seconds % 60
    output.clear()
    output.markdown(`# ${min}:${("0" + sec).slice(-2)}`)
}

function countdown(seconds) {
    showTime(seconds)
    const startTime = Date.now()
    let diff = 1
    while (true) {
        if (Date.now() > startTime + (diff * 1000)) {
            showTime(seconds - diff)
            diff++
            if (diff === seconds + 1)
                break
        }
    }
}

output.clear()
let time = await input.buttonsAsync("Set Timer Length", timerOptions)
countdown(Number(time))
output.markdown("# ✅ DONE!")