smac/lib/SignalRef.ts

Scriptcraft SMA Server controller

// Fix for inquirer trapping SIGINT
// See: https://github.com/SBoudrias/Inquirer.js/issues/293#issuecomment-422890996

export class SignalRef {
    signal: NodeJS.Signals
    handler: () => void
    interval: NodeJS.Timeout
    constructor(signal, handler) {
        this.signal = signal
        this.handler = handler

        process.on(this.signal, this.handler)

        // This will run a no-op function every 10 seconds.
        // This is to keep the event loop alive, since a
        // signal handler otherwise does _not_. This is the
        // fundamental difference between using `process.on`
        // directly and using a SignalRef instance.
        this.interval = setInterval(() => {}, 10000)
    }

    unref() {
        clearInterval(this.interval)
        process.removeListener(this.signal, this.handler)
    }
}