Hook errors in MUI Data Grid with fresh install
Newest questions tagged reactjs - Stack Overflow • 2026-04-21 22:31

Hook errors in MUI Data Grid with fresh install

I am using a stripped down version of the example used in the documentation, however I get these errors: Here's my code: import Box from '@mui/material/Box'; import { DataGrid, type GridColDef } from '@mui/x-data-grid'; import './App.css' const columns: GridColDef<(typeof rows)[number]>[] = [ { field: 'id', headerName: 'ID', width: 90 }, { field: 'lastName', headerName: 'Last name', w...

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DEV Community • 2026-04-21 22:30

Salesforce Headless! All agents, all access.

Salesforce just flipped a switch at TDX 2026 that matters more than most announcements in recent memory: your Salesforce org is now an MCP server. Every Developer Edition org ships with Salesforce Hosted MCP Servers at no cost, and any MCP-compatible AI agent — Claude, Claude Code, Cursor, Codex, Windsurf — can now read data, trigger flows, run SOQL, and invoke Apex directly, with no browser invol...

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DEV Community • 2026-04-21 22:28

Ship Fast, Lose Clients: Why AI-Accelerated Fragility Is Not Engineering

For the last year, the software world has been split into two incompatible narratives. In one narrative, speed is everything. AI tools generate code at machine pace, developers "vibe" their way through features, and shipping fast is treated as the new currency of relevance. Recruiters reward velocity. Social media rewards velocity. Even junior developers, overwhelmed by the job market, cling to v...

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Hacker News: Front Page • 2026-04-21 22:27

SpaceX Said to Agree to Buy Cursor for More Than $50B

Article URL: https://www.nytimes.com/2026/04/21/business/spacex-cursor-deal.html Comments URL: https://news.ycombinator.com/item?id=47855448 Points: 24 # Comments: 7

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DEV Community • 2026-04-21 22:23

Pygame Snake, Pt. 2

In part 1, we just got pygame going. We have a 1000x1000 pixel canvas, with a 50x50 square moving more-or-less continuously. Snake is played on a fixed grid. Instead of 50x50 pixels, we'll shrink the snake parts/tiles to 20x20, and we'll shrink the canvas to 600x600 pixels, treated as a 30x30 grid. (30 tiles x 20 pixels = 600 pixels.) We'll add three variables to represent these values: W = 3...

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DEV Community • 2026-04-21 22:17

Creating a Command Palette Component in Angular (Part 1)

Dynamic Palette Generation Sources: GitHub: https://github.com/ZeroaNinea/Command-Palette-Angular GitHub Pages: https://zeroaninea.github.io/Command-Palette-Angular/ This is the first part of a series where I build a reusable and customizable command palette in Angular. Since the component needs to support different themes, I started by creating a dynamic color palette...

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Hacker News: Front Page • 2026-04-21 22:13

SpaceX says it has agreement to acquire Cursor for $60B

https://www.reuters.com/technology/spacex-says-it-has-option...https://www.nytimes.com/2026/04/21/business/spacex-cursor-de... (https://archive.ph/c2Tac)https://www.bloomberg.com/news/articles/2026-04-21/spacex-sa... Comments URL: https://news.ycombinator.com/item?id=47855293 Points: 53 # Comments: 126

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DEV Community • 2026-04-21 22:13

Building Multi-Agent Systems: What I Learned From 6 Months of Production Failures

Building Multi-Agent Systems: What I Learned From 6 Months of Production Failures I have been running a crew of autonomous AI agents for about six months now. We have completed 454 tasks. We have also failed in every way you can think of. Here is what actually breaks when you put agents in production. The Silent Failure Problem The worst failures are not crashes. Crashes ar...

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Hacker News • 2026-04-21 22:12

Show HN: Almanac MCP, turn Claude Code into a Deep Research agent

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DEV Community • 2026-04-21 22:06

How We Built a Self-Healing Agent Marketplace with 201 Competing AI Agents

Most agent frameworks assume you know the best agent for the job before the job starts. You pick a model, wire a DAG, and hope it holds. We didn't know. So we made 201 agents compete for every task — and let outcomes decide. This is the architecture behind Sturna.ai, and why we call it the octopus brain. The Problem with Static DAGs LangGraph, CrewAI, AutoGen — they're all variations...

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DEV Community • 2026-04-21 22:05

Hello Dev 👋

Hey Dev community 👋 I'm Sébastien, based in Geneva 🇨🇭, and I've been shipping web apps for 20 years. Figured it was finally time to stop lurking and start writing here. What I do nammu.ch — my web dev agency. Two decades of React, Node, MySQL, and more recently Laravel/Filament. Clients across Switzerland, mostly custom apps and bespoke CMS work. Kiwi — an AI-powered platform for fre...

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DEV Community • 2026-04-21 22:05

The Delegation Debt Problem: When Your Agent Owes More Than It Can Deliver

The Delegation Debt Problem: When Your Agent Owes More Than It Can Deliver Every autonomous agent system eventually hits the same wall: a pile of obligations it can't clear. Not because the agent is broken. Not because the tasks are impossible. But because the agent accumulated commitments faster than it could fulfill them. Delegation debt is the gap between what your agent has promise...

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DEV Community • 2026-04-21 22:04

Stop Losing Your API Calls: Build a Production-Ready Browser Cache in 5 Minutes

If you've ever opened DevTools and watched the same API call fire over and over again — for data that hasn't changed in hours — this article is for you. I've been there. A dashboard that re-fetches user profiles on every tab switch. A product page that hits the database every single render. A PWA that breaks the moment the user goes offline. The solution isn't complicated. It's caching. But doin...

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DEV Community • 2026-04-21 22:01

Building a C# Agent with Microsoft Agent Framework and Ollama

Building a C# Agent with Microsoft Agent Framework and Ollama Part 3 of "Running LLMs & Agents on Azure Container Apps" We've got Ollama running in Azure Container Apps with persistent storage and secure access. Now let's write an agent that talks to it. Two weeks ago, Microsoft shipped Agent Framework 1.0 -- the production-ready successor to both Semantic Kernel and AutoGen. S...

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DEV Community • 2026-04-21 21:57

6 AI App Builders Tested on Full Products: Which One Shipped a Real Multi-Screen App in 2026?

Most AI app builders are very good at one thing: generating a beautiful single screen from a prompt. But if you need a real, multi-screen product — a dashboard connected to a settings panel connected to a user flow — the list of tools that actually deliver gets very short, very fast. We tested six AI app builders on the same brief: build a multi-screen productivity app with a home dashboard, an o...

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What would you do with an AI model capable of continuous learning?
DEV Community • 2026-04-21 21:54

What would you do with an AI model capable of continuous learning?

Eight years ago I had an idea. Four weeks ago I decided to start implementing that idea. Last weekend I started running an experiment to validate this idea. This is real data: The model has a fixed set of 5.6B parameters. It does not expand parameters. It does not rely on an external memory system or replay buffers. This chart is the result of running four continuous learning sessions with the ...

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DEV Community • 2026-04-21 21:53

From Sockets to Server: What I Learned Building My Own Web Server

1) The Question That Started It Most of us use web servers through frameworks that hide the hard parts. You define routes, deploy, and move on. I wanted to understand what happens underneath. So I built an HTTP server in C++ from scratch—starting with POSIX sockets, then layering parsing, routing, static file serving, and concurrency. No frameworks. Just syscalls, buffers, and edge ca...

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DEV Community • 2026-04-21 21:53

Software End of Life vs End of Support (2026)

...And What It Means When You're Managing Multiple Websites and Applications Your digital team doesn't struggle to understand what end of support or end of life means in theory. What they struggle with is the weight of knowing what these signals mean in practice when they're responsible for an entire portfolio of websites and applications. A single outdated component on just one website might be...

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DEV Community • 2026-04-21 21:53

Chapter 2: Backward - Automatic Gradient Computation

What You'll Build The Backward() method on Value. Starting from a final output (like the loss), it walks the computation graph in reverse and fills in the .Grad field on every Value, answering "if I nudged this number, how much would the final output change?" Depends On Chapter 1 (the Value class with forward operations). Why This Matters Training a neural networ...

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DEV Community • 2026-04-21 21:51

Why Your Production LLM Prompt Keeps Failing (And How to Diagnose It in 4 Steps)

You ship a prompt. It works in the playground. Two weeks later, someone files a bug: the model is doing something completely wrong in a specific context. You read the prompt again. Nothing looks broken. So you rewrite it. The bug is gone — but now three other behaviors regressed. You fix those, and the cycle starts again. This is the most common failure mode in production LLM systems: debugging ...

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