Todd Pressley toddpress

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~

	?xml version="1.0" encoding="utf-8"?>

	<configuration>
	<appSettings>
	<!--
	All appSettings are made available to your Node.js app via environment variables
	You can access them in your app through the process.env object.

	process.env.<key>
	-->

	<script>
	$.as.route.page('settings', () => {
	if(!S.user.is){ return $.as.route('hi') }
	$.as('#settings', S.user);

	;(() => {
	$('#pet').on('keyup', function(){ $('.pet').text(this.value.length + ' letters.') });
	$('#kiss').on('keyup', function(){ $('.kiss').text(this.value.length + ' letters.') });

	S.user.get('settings').get('pet').on(function(l){ $('#pet').val(Gun.text.random(l, '*')) });

	function Enum(names) {
	let members = Object.create(null);

	members.tryParse = name => {
	if (!members[name]) {
	throw new Error(`Unable to parse '${name}' as an Enum member.`);
	}
	return members[name];
	};

	function logClass(target: any) {

	// save a reference to the original constructor
	var original = target;

	// a utility function to generate instances of a class
	function construct(constructor, args) {
	var c : any = function () {
	return constructor.apply(this, args);
	}

	var child_process = require('child_process'),
	http = require('http');
	url = require('url'),
	ffmpeg = null;

	var livestream = function (req, resp) {
	// For live streaming, create a fragmented MP4 file with empty moov (no seeking possible).

	var input = 'udp://225.1.1.1:8208';

	#include "FastLED.h"

	// This sketch shows how to sequence a performance using HH,MM,SS.SSS timecode.
	//
	// A "ResetPerformance" method is provided so that the performance can be
	// restarted from a custom external trigger, e.g., a button or event.
	// For demonstration purposes, this Performance is reset if the
	// sketch receives a letter "r" on the serial port.
	//
	// -Mark Kriegsman, January 2015

	#include "FastLED.h"

	// This sketch shows one way to define a 'timed playlist'
	// of animations that automatically rotate on a custom schedule.
	//
	// A "ResetPlaylist" method is provided so that the playlist can be
	// restarted from a custom external trigger, e.g., a button or event.
	// For demonstration purposes, the playlist is reset if the
	// sketch receives a letter "r" on the serial port.
	//

	#include "FastLED.h"

	#define LED_PIN 3
	#define LED_TYPE WS2811
	#define COLOR_ORDER GRB
	#define NUM_LEDS 30
	CRGB leds[NUM_LEDS];

	#define BRIGHTNESS 120
	#define DENSITY 80

	import './app.tag'
	riot.mount('#app', 'app')