Simple ports of setTimeout and setInterval in GJS

gjs-timeout-and-interval.js

#!/usr/bin/env gjs

const GLib = imports.gi.GLib;


/**
 * https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/setInterval
 * https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/clearInterval
 */
window.setInterval = function(func, delay, ...args) {
    return GLib.timeout_add(GLib.PRIORITY_DEFAULT, delay, () => {
        func(...args);
        return GLib.SOURCE_CONTINUE;
    });
};

window.clearInterval = GLib.source_remove;


/**
 * https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout
 * https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/clearTimeout
 */
window.setTimeout = function(func, delay, ...args) {
    return GLib.timeout_add(GLib.PRIORITY_DEFAULT, delay, () => {
        func(...args);
        return GLib.SOURCE_REMOVE;
    });
};

window.clearTimeout = GLib.source_remove;


/**
 * Example
 */
Promise.delay = (delay) => new Promise(resolve => setTimeout(resolve, delay));

async function example() {
    try {
        log('wait a second...');
        await Promise.delay(1000);
        
        log('starting first timer');
        let intervalId1 = setInterval(() => log('timer1'), 1000);
        let timeoutId1 = setTimeout(() => clearInterval(intervalId1), 6000);

        log('starting second timer');
        let intervalId2 = setInterval(log, 500, 'timer2');
        let timeoutId2 = setTimeout(() => clearInterval(intervalId2), 3000);
    } catch (e) {
        logError(e);
    }
}

example();

// Need an event loop running
let loop = GLib.MainLoop.new(null, false);
loop.run();