Tomáš Horáček heracek

Ah, the joys of waking up to find the Mac's done an overnight upgrade… and erm, suddenly things stop working. Thankfully, me and Claude managed to work out what the fuck is going on… I'm sharing here, as well as having raised in on https://feedbackassistant.apple.com/feedback/22280434 (that seems to need a login?).

Bug Report: macOS 26 breaks /etc/resolver/ supplemental DNS for custom TLDs

Product: macOS 26.3.1 (Darwin 25.3.0, Build 25D771280a) Component: Networking → DNS / mDNSResponder Regression from: macOS ~~25.x~~ 26.3.0 (working immediately prior to overnight update)

Claude CLI Print Mode Experiments

Date: 2026-01-08
CLI Version: 2.1.2
Total Experiments: 29

Raw experiment outputs from testing various claude -p flag combinations.

description

Interview me about the plan

argument-hint

plan

model

opus

Read this plan file $1 and interview me in detail using the AskUserQuestionTool about literally anything: technical implementation, UI & UX, concerns, tradeoffs, etc. but make sure the questions are not obvious.

Migration Guide: React Query → TanStack DB

Migration Pattern

Replace React Query's server state management with TanStack DB's client-side database.

BEFORE: React Query

// api/posts.ts
export const postsApi = {
  getAll: async (): Promise<Post[]> => fetch('/api/posts').then(r => r.json()),

Next.js client-only SPA example

Made this example to show how to use Next.js router for a 100% SPA (no JS server) app.

You use Next.js router like normally, but don't define getStaticProps and such. Instead you do client-only fetching with swr, react-query, or similar methods.

You can generate HTML fallback for the page if there's something meaningful to show before you "know" the params. (Remember, HTML is static, so it can't respond to dynamic query. But it can be different per route.)

Don't like Next? Here's how to do the same in Gatsby.

	#!/usr/bin/env bash
	set -euo pipefail

	# ─── Convex Deployment Migration ─────────────────────────────────────────────
	# Exports data from one Convex deployment and imports into another with
	# --replace-all. Handles the .env.local precedence gotcha by swapping it
	# temporarily, uses --prod on both export/import, and includes a full
	# migration checklist (env vars, deploy).
	#
	# Usage:

	// Types for the result object with discriminated union
	type Success<T> = {
	data: T;
	error: null;
	};

	type Failure<E> = {
	data: null;
	error: E;
	};

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>My Angular from Scratch</title>
	<style>
	.my-component {
	font-family: Arial, sans-serif;

	#!/usr/bin/env bash

	# Abort sign off on any error
	set -e

	# Start the benchmark timer
	SECONDS=0

	# Repository introspection
	OWNER=$(gh repo view --json owner --jq .owner.login)

	import proxy from 'http2-proxy';
	import type { Plugin, ProxyOptions } from 'vite';

	export const pluginHttp2Proxy = (): Plugin => {
	let routes: Record<string, string \| ProxyOptions>;
	return {
	name: 'vite-plugin-http2-proxy',
	config: (config) => {
	const { server } = config;
	routes = server?.proxy ?? {};