https://www.mk.ru/sw/pwa-ui-logging.js

1(function (root) {
2    'use strict';
3
4    root.MKPwaUi = root.MKPwaUi || { layers: {} };
5
6    root.MKPwaUi.layers.createLoggingLayer = function createLoggingLayer(config) {
7        var enabled = config.enableLogLayer === true;
8
9        function emit(level, args) {
10            if (!enabled || !console || typeof console[level] !== 'function') {
11                return;
12            }
13            console[level].apply(console, args);
14        }
15
16        return {
17            enabled: enabled,
18            info: function () {
19                emit('info', arguments);
20            },
21            warn: function () {
22                emit('warn', arguments);
23            },
24            log: function () {
25                emit('log', arguments);
26            },
27            relayFromServiceWorker: function (data) {
28                if (!enabled || !data) {
29                    return;
30                }
31                var level = (typeof data.level === 'string' && typeof console[data.level] === 'function') ? data.level : 'log';
32                console[level]('[PWA<-SW]', data.event, data.payload || {});
33            }
34        };
35    };
36})(window);