spookyuser

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.~~

First Method

Deleting the .git folder may cause problems in our git repository. If we want to delete all of our commits history, but keep the code in its current state, try this:

# Check out to a temporary branch:
git checkout --orphan TEMP_BRANCH

# Add all the files:
git add -A

	# This code will use the devpi cache if it can be found
	# otherwise fail with a few complaints
	RUN export HOST_IP=$(ip route\| awk '/^default/ {print $3}') \
	&& mkdir -p ~/.pip \
	&& echo [global] >> ~/.pip/pip.conf \
	&& echo extra-index-url = http://$HOST_IP:3141/app/dev/+simple >> ~/.pip/pip.conf \
	&& echo [install] >> ~/.pip/pip.conf \
	&& echo trusted-host = $HOST_IP >> ~/.pip/pip.conf \
	&& cat ~/.pip/pip.conf

	/**
	* Utils for I/O operations.
	* <p/>
	* Created by Tomek on 09/06/15.
	*/
	public class IoUtils {

	/**
	* Reads file and returns a String.
	*

	def timeit(f):
	def timed(args, *kw):
	ts = time.time()
	result = f(args, *kw)
	te = time.time()
	print("function time {} : {} sec".format(f.__name__, te - ts))
	return result

	return timed

	'use strict';

	var WebSocketServer = require('ws').Server;
	var wss = new WebSocketServer({ port: 5013 });

	wss.on('connection', function connection(ws) {
	ws.on('message', function onMessage(message) {
	console.log(message);
	});
	});

	// Original written by tsuharesu
	// Adapted to create a "drop it in and watch it work" approach by Nikhil Jha.
	// Just add your package statement and drop it in the folder with all your other classes.

	import android.content.Context;
	import android.preference.PreferenceManager;
	import android.util.Log;

	import java.io.IOException;
	import java.util.HashSet;

	/**
	* Use this to help determine which images are being used
	* at which breakpoint. Will print lots of useful information
	* on shown resolution, actual resolution, DPR and more
	* Usage:
	* var elems = document.querySelectorAll('.c-hero-banner__background img')
	* responsiveImageDebugOutput(elems);
	*
	* Author: Carl-Erik Kopseng
	* Source: https://gist.github.com/fatso83/55fc446df3f3965ecd66e8307a5dc0e6

	/* Copyright 2016 Patrick Löwenstein
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,