How to use the robotjs.setMouseDelay function in robotjs

async doAlwaysOnTopOnMac() {
        await robot.setMouseDelay(500);
        await robot.moveMouse(190, 0);
        await robot.mouseClick();
        // Key tap 7 times as "Always on Top" is in the
        // 7th position under view menu item
        for (let i = 0; i < 7; i++) {
            await robot.keyTap('down');
        }
        await robot.keyTap('enter');
    }

});

// Node.js application will not terminate until the readline.Interface is closed
// Called when close is called
terminal.on('close', function () {
    process.exit(0);
});

usbPort.on('open', function () {
    // stty -echo hides echoed response.  stty echo shows response
    writeSerial('stty -echo\r');
    terminal.prompt();
});


robot.setMouseDelay(0);
usbPort.on('data', function (data) {
    if (data != undefined) {
        if (data.indexOf('{') == 0) {
            // data is json
            try {
                jsonData = JSON.parse(data);
                if (jsonData.uart) {
                    if (stylusEvent != null) {
                        stylusEvent.send('stylusRx');
                    }
                } else if (jsonData.data) {
                    if (calibrating) {
                        calibrate(jsonData);
                    }
                    if (trained) {
                        var output = net.run({

async fullScreenOnMac() {
        await robot.setMouseDelay(100);
        await robot.moveMouseSmooth(205, 10);
        await robot.mouseClick();
        await robot.setKeyboardDelay(100);
        // Key tap 5 times as "Enter Full Screen" is in the
        // 5th position under view menu item
        for (let i = 0; i < 5; i++) {
            await robot.keyTap('down');
        }
        await robot.keyTap('enter');
    }

async doAlwaysOnTopOnMac() {
        await robot.setMouseDelay(500);
        await robot.moveMouse(190, 0);
        await robot.mouseClick();
        // Key tap 7 times as "Always on Top" is in the
        // 7th position under view menu item
        for (let i = 0; i < 7; i++) {
            await robot.keyTap('down');
        }
        await robot.keyTap('enter');
    }

login(hostname) {

// Speed up the mouse.
    robot.setMouseDelay(500);

    const screenSize = robot.getScreenSize();
    const height = screenSize.height;
    const width = screenSize.width;
    // fix keyboard layout
    robot.keyToggle("space","down");
    robot.keyToggle("space","up");

    robot.moveMouse(width/2,height*0.56);
    robot.mouseClick();

    robot.moveMouse(width/2,height*0.68);
    robot.mouseClick();

    robot.keyToggle("a","down","control");
    setTimeout(() => {

await this.app.browserWindow.getBounds().then(async (bounds) => {
            await robot.setMouseDelay(100);
            let x = bounds.x + 95;
            let y = bounds.y + 35;
            await robot.moveMouseSmooth(x, y);
            await robot.moveMouse(x, y);
            await robot.mouseClick();
            await webAction.openApplicationMenuByClick();
            await robot.setKeyboardDelay(1000);
            await robot.keyTap('enter');
            await robot.keyTap('down');
            await robot.keyTap('down');
            await robot.keyTap('right');
            for (let i = 0; i < 6; i++) {
                await robot.keyTap('down');
            }
            await robot.keyTap('enter');
        });

async actionForMenusOnMac(arrMenu) {
        let webAction = await new WebActions(this.app);
        await robot.setMouseDelay(2000);
        let x = 5;
        let y = 5;
        await robot.moveMouseSmooth(x, y);
        await robot.moveMouse(x, y);
        await robot.mouseClick();
        await robot.setKeyboardDelay(100);
        for (var i = 0; i < arrMenu.length; i++) {
            if (i == 0) {
                for (var s = 0; s < arrMenu[i].step; s++) {

                    await robot.keyTap('right');
                }
            }
            else {
                for (var s = 0; s <= arrMenu[i].step; s++) {

await this.app.browserWindow.getBounds().then(async (bounds) => {
            await robot.setMouseDelay(100);
            let x = bounds.x + 95;
            let y = bounds.y + 35;
            await robot.moveMouseSmooth(x, y);
            await robot.moveMouse(x, y);
            await robot.mouseClick();
            await webAction.openApplicationMenuByClick();
            await robot.setKeyboardDelay(1000);
            await robot.keyTap('enter');
            await robot.keyTap('down');
            await robot.keyTap('down');
            await robot.keyTap('right');
            for (let i = 0; i < 6; i++) {
                await robot.keyTap('down');
            }
            await robot.keyTap('enter');
        });