Mark Erikson markerikson

Replay Case Study: How Replay Helped Find a React Bug Faster than Dan Abramov Did

Authors: Mark Erikson Cover photo: No Date: April 17, 2026 hidden: Yes tags: Case studies, Story

We’ve always said that Replay time-travel recordings enable developers to solve really hard bugs, by giving them the ability to inspect the app’s behavior at any point in time. This is especially true for timing bugs and race conditions, where it may be impossible to actually debug them with standard developer tools that would block the race condition from even happening. Now, with Replay MCP, we’re giving agents those same time-travel investigation superpowers.

Learn with Jason, 2024-01-04: What's New in Redux Toolkit 2.0?

Migration Guides
Release Notes
- RTK: https://github.com/reduxjs/redux-toolkit/releases/tag/v2.0.0
- Redux core: https://github.com/reduxjs/redux/releases/tag/v5.0.0
Yes, createStore is still deprecated! https://redux.js.org/usage/migrations/migrating-rtk-2#createstore-deprecation

Learn with Jason, 2023-06-08: Redux in 2023

Topics:

Changes to Redux / RTK since 2021
- Redux core:
  - v4.1: better error messages
  - v4.2: deprecated createStore to encourage RTK usage
- React-Redux
v8.0: useSyncExternalStore, TS

RTK ESM/TS Discussion

Attendees:

Nathan Bierema
Mateusz Burzynski
Mark Erikson

Notes

Mateusz: what do you want besides "ship widely compat code?" What preferences?

React Data Fetching Library Summit - 2023-02-16

Attendees

Lenz Weber-Tronic
Dominik Dorfmeister
Fredrik Hoglund
Jerel Miller
Alessia Bellisario
Andrew Clark

Questions

Company

company location / remote?
what project management method?
good and bad company culture?
performance reviews?
what's the path to profitability?

Double-checking whether window exists in React Native:

react native window global

Finding the giant "useLayoutEffect warnings" thread:

react uselayouteffect ssr

	// omit imports and stuff

	// Using Next 11.1

	module.exports = withPlugins(
	[
	withBundleAnalyzer({
	enabled: process.env.ANALYZE === 'true'
	})
	],

	import React from 'react';

	import Jumbotron from 'react-bootstrap/Jumbotron';
	import Alert from 'react-bootstrap/Alert';
	import Button from 'react-bootstrap/Button';

	import { FallbackProps } from 'react-error-boundary';


	interface AEFProps extends FallbackProps {

	// Example of using multiple / nested `createEntityAdapter` calls within a single Redux Toolkit slice

	interface Message {
	id: string;
	roomId: string;
	text: string;
	timestamp: string;
	username: string;
	}