Yavor Kirov YavorK

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.

	<!DOCTYPE html>
	<html>

	<head>
	<title>Hello Page</title>
	<script src="https://unpkg.com/[email protected]"></script>
	</head>

	<body>
	<h1>Hello</h1>

	<?php

	/**
	* Use
	* <?= fragment_start('this_is_my_fragment') ?>
	* Fragment content <?= $with_variables_and_stuff ?>
	* <?= fragment_end('this_is_my_fragment') ?>
	*/

	/**

	# Theory
	## Vuejs
	- Vue Step By Step (up to & including ep. 29) - https://laracasts.com/series/learn-vue-2-step-by-step


	## VueX
	Vuex is state management for Vue.
	- Short intro https://www.youtube.com/watch?v=LW9yIR4GoVU - The example is good to understand how Vuex works. However DO NOT use Vuex to build components with. We only use it to share app-wide data - for example the currently logged in user or the current shop's data (that many components might need). If you are building a component tree, just pass the data as props.
	- Docs https://vuex.vuejs.org/

	/*
	Solution to https://edabit.com/challenge/voZCqTGMSNjCrRhf9
	Minesweeper I — Grid
	This challenge is based on the game Minesweeper.
	Create a function that takes a grid of # and -, where each hash (#) represents a mine and each dash (-) represents a mine-free spot. Return an array where each dash is replaced by a digit indicating the number of mines immediately adjacent to the spot (horizontally, vertically, and diagonally).
	Examples
	numGrid([
	["-", "-", "-", "-", "-"],
	["-", "-", "-", "-", "-"],
	["-", "-", "#", "-", "-"],

	<html>
	<body>
	<div id="result"></div>
	<script>
	if (typeof(EventSource) !== 'undefined') {
	console.info('Starting connection...');
	var source = new EventSource('/stream.php');
	source.addEventListener('open', function(e) {
	console.info('Connection was opened.');
	}, false);

	<?php

	$combos = [
	'paper' => [
	'vs_rock' => 'wins',
	'vs_scissors' => 'loses',
	],
	'rock' => [
	'vs_paper' => 'loses',
	'vs_scissors' => 'wins',

	<?php

	$percentages = [
	'Milk' => 50,
	'Coffee' => 30,
	'Water' => 20,
	];
	$percentSum = 0;
	foreach ($percentages as $valuePercent) {
	$percentSum = $percentSum + $valuePercent;

	class math {
	constructor() {
	this.current = 0;
	}

	add(number) {
	this.current += number;
	return this;
	}