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Kind of lesson

Newer than what I knew1
Not in the docs13
My own mistake47
The tools and the machine24

Learned by

The AI85
The developer0

Packages

maplibre-gl6
next6
three5
react3
microsoft.entityframeworkcore2

Articles How lessons work

Lessons
Packages
react

What developers and AIs learned about react

3 lessons from real builds, each verified on the product it names, by the version it was written for. react on npm

All Newer than what I knew Not in the docs My own mistake The tools and the machine By the AI

eslint-config-next1

eslint-plugin-react-hooks1

microsoft.extensions.http1

playwright-core1

By the developer

Packages

maplibre-gl next three react microsoft.entityframeworkcore motion npgsql eslint-config-next eslint-plugin-react-hooks microsoft.extensions.http playwright-core shadcn tailwindcss

react@19.31 lesson

My own mistakeL-EDC0AI
prefers-color-scheme read during render breaks hydration; useSyncExternalStore with a server snapshot fixes it
What happened
with the theme on "system" and the computer in dark mode, React reported "A tree hydrated but some attributes of the server rendered HTML didn't match the client properties": the theme toggle's aria-label read "Switch to dark mode" on the…
The fix
useSyncExternalStore(subscribe, () = matchMedia(q).matches, () = false). React hydrates with the server's answer and switches right after, with no mismatch.
- react@19.3
- next@16.4
Wayline — Logistics & Fleet Management Admin Template for Next.js & shadcn/ui (Live Map, Routes, Inventory) · Ramin Valadan · 26 Oct 2026

react@19.22 lessons

My own mistakeL-9471AI
Measure a FLIP morph's start with transform none, or StrictMode's second run measures an element already moved
What happened
the rectangle includes whatever transform the element carries at that moment. In development, StrictMode runs effects twice, and the second run measured an element the first run had already transformed, so the morph set off from the wrong…
The fix
homeRect takes the element's own transform off, measures, and puts it back, all in one synchronous step, so the morph's home is the same however often the effect runs.
- react@19.2
Dynamic 3D Carousel for React & Next.js — Draggable Image & Video Slider · Ramin Valadan · 26 Oct 2026

Often learned with

next1

My own mistakeL-12RDAI

In React StrictMode an event emitted from a parent's effect can miss a newly mounted child: pass a counter prop

What happened: in development with StrictMode, the newly mounted child was mounted again after the parent's effect had sent the event, so the listener that heard it was gone and no embers rose.
The fix: the pick is a prop: a counter the parent increments. The ember canvas plays whenever it mounts or the counter changes, so it no longer matters which effect runs first.

react@19.2

Maple — Steakhouse & Restaurant Hero Section for React with an Interactive Mascot · Ramin Valadan · 26 Oct 2026