Tomas Ruzicka LeZuse

Storybook 5 Release Candidate

We're excited to announce that Storybook 5 (SB5) has reached release candidate status! SB5 is our most ambitious release yet, and we'd love your help testing.

Storybook 4 was a complete overhaul of Storybook's guts; now SB5 does the same thing for Storybook's UI with:

🖼 Navigation sidebar redesign

Vojtech Prikryl (@productboard)

Delightful Drag and Drop for complex interactive UIs

Drag and Drop is undoubtedly one of the most popular and user-friendly interactions in software nowadays. There are plenty awesome libraries for DnD in React realm, covering most of the use cases. We tried them all at productboard, but realized we need something special for complex interfaces we are building. We developed our own solution that satisfied three main requirements we had:

Delightful user experience 🤩
Great performance even for large datasets 🏎
Reusability of already existing code 🔌

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

Profiling in production
- Create React App
- Webpack 4

Profiling in production

React DOM automatically supports profiling in development mode for v16.5+, but since profiling adds some small additional overhead it is opt-in for production mode. This gist explains how to opt-in.

This API was removed in React 17

Interaction tracing with React

React recently introduced an experimental profiler API. After discussing this API with several teams at Facebook, one common piece of feedback was that the performance information would be more useful if it could be associated with the events that caused the application to render (e.g. button click, XHR response). Tracing these events (or "interactions") would enable more powerful tooling to be built around the timing information, capable of answering questions like "What caused this really slow commit?" or "How long does it typically take for this interaction to update the DOM?".

With version 16.4.3, React added experimental support for this tracing by way of a new NPM package, scheduler. However the public API for this package is not yet finalized and will likely change with upcoming minor releases, so it should be used with caution.

Faster Rails tests

Feedback loop speed in one of the biggest contributing factors to overall development time. The faster you get results, the faster you can move on to other things. A fast enough test suite is therefore critical to teams' success, and is worth investing some time at the beginning to save in the long run.

Below is a list of techniques for speeding up a Rails test suite. It is not comprehensive, but should definitely provide some quick wins. This list of techniques assumes you're using minitest, but most everything should translate over to rspec by simply replacing test/test_helper.rb with spec/spec_helper.rb.

Lead with data
bcrypt
bootsnap
Cache Time::utc calls

The Rules of React

All libraries have subtle rules that you have to follow for them to work well. Often these are implied and undocumented rules that you have to learn as you go. This is an attempt to document the rules of React renders. Ideally a type system could enforce it.

What Functions Are "Pure"?

A number of methods in React are assumed to be "pure".

On classes that's the constructor, getDerivedStateFromProps, shouldComponentUpdate and render.

	# Original source: https://gist.github.com/hopsoft/56ba6f55fe48ad7f8b90
	# Merged with: https://gist.github.com/kofronpi/37130f5ed670465b1fe2d170f754f8c6
	namespace :db do
	desc 'Dumps the database to backups'
	task dump: :environment do
	dump_fmt = ensure_format(ENV['format'])
	dump_sfx = suffix_for_format(dump_fmt)
	backup_dir = backup_directory(Rails.env, create: true)
	full_path = nil
	cmd = nil

	import * as http from "http";

	export interface MessageAdapterOptions {
	syncResponseTimeout: number;
	lateResponseFallbackEnabled: boolean;
	}

	export interface ActionMatchingConstraints {
	callbackId?: string \| RegExp;
	type?: "select" \| "button" \| "dialog_submission";

	new UglifyJsPlugin({
	uglifyOptions: {
	compress: {
	arrows: false,
	booleans: false,
	cascade: false,
	collapse_vars: false,
	comparisons: false,
	computed_props: false,
	hoist_funs: false,

	default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
	default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
	default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'