How to use the electron-settings.set function in electron-settings

let generateDefaultSettings = () => {
        settings.set('sampleRate', 1140000);
        settings.set('stereo', true);
        settings.set('lastTuned', true);
        settings.set('localPlayer', true);
        settings.set('serverPort', 1337);
        settings.set('lastFrequency', '93200000');
        settings.set('ppm',0);
        settings.set('recordingsPath', app.getPath('music'));
        //var R4.set('name','BBC R4').set('freq',91000000)
        //console.log(settings.get('presets').length);
        settings = settings.set('offsetTuning', true);
    };

function setPreferences() {
  document.getElementById("restartDiv").style.visibility = "visible";
  settings.set("militaryTime", (document.getElementById("timeType").checked).toString());
  settings.set("defaultTime", document.getElementById("defaultTime").value);
  settings.set("closeOnX", (document.getElementById("closeOnXcheck").checked).toString());
  settings.set("lagHours", document.getElementById("lagHours").value);
  settings.set("lagMinutes", document.getElementById("lagMinutes").value);
  settings.set("upTimeHours", document.getElementById("upTimeHours").value);
  settings.set("upTimeMinutes", document.getElementById("upTimeMinutes").value);
  settings.set("upTime", (document.getElementById("upTime").checked).toString());
  var tempstring = settings.get("closeOnX") + " Sandman";
  writeFile(tempstring);
  return;
  //console.log(settings.getAll());
}

function set(key, value) {
    if(activeInstance) {
      settings.set(key, value);
    } else {
      memorySettings[key] = value;
    }
  }

export function set(key: settingKeys, value: any): Promise {
  if (isDev) {
    DEV_CONFIG[key] = value;
    return Promise.resolve()
  }

  return settings.set(key, value)
}

settings.get('steam_api_key').then(val => {
        if (val === undefined) {
            steamApiKey = key;
            steamUser = new SteamApi.User(key);
        }
        settings.set('steam_api_key', key);
        Materialize.toast('Steam API key saved!', 5000, 'rounded');
        getHeroesList();
    });
});

update: (address) => {
		addresses[address.infoHash] = address
		settings.set('addressbook', addresses)
	},
	updateList: (addressList) => {

function unsubscribe(host, titlekey) {
    let key_path = "comic." + host + "." + titlekey;
    let comicData = settings.get(key_path);
    if (comicData) {
        comicData.subscribed = false;
        settings.set(key_path, comicData);
        updateSubscribeUIStatus();
    }
}

setSettings (notifications, tray, kiosk, toolbar, icon, c_user, c_password) {
    settings.set('notifications', notifications)
    settings.set('tray', tray)
    settings.set('kiosk', kiosk)
    settings.set('toolbar_always', toolbar)
    settings.set('icon', icon)
    settings.set('c_user', c_user)
    settings.set('c_password', c_password)
  }

setSettings (notifications, tray, kiosk, toolbar, icon, c_user, c_password) {
    settings.set('notifications', notifications)
    settings.set('tray', tray)
    settings.set('kiosk', kiosk)
    settings.set('toolbar_always', toolbar)
    settings.set('icon', icon)
    settings.set('c_user', c_user)
    settings.set('c_password', c_password)
  }