matthew-gerstman

# Mirror Convenience Hooks Proposal

## Overview

This proposal introduces three convenience hooks to reduce unnecessary re-renders and improve developer experience when working with Mirror data. These hooks cover the most common patterns found in the codebase that currently cause suboptimal re-render behavior.

**Current state:**
- `useMirrorList` and `useGlobalMirrorList` now use derived atoms with shallow array equality ✅
- Selector hooks (PR #3754) were reverted due to complexity concerns ❌

matthew-gerstman

# Mirror Hooks Optimization Proposal

## Overview

This document proposes a comprehensive approach to optimizing Mirror hooks to reduce unnecessary re-renders. It builds on two complementary changes:

1. **PR #3830** - Refactor `useMirrorList` to use derived atoms with shallow equality
2. **PR #3754** - Add selector hooks (`useMirrorListSelector`, `useMirrorFilteredMap`) for advanced cases

## Current State

matthew-gerstman

# Artifact Preview Generation Flakiness Analysis

## Root Cause Analysis

The preview generation system has multiple failure points causing previews to not display:

### 1. Race Condition (Primary Issue)
The flow is:
1. Create artifact → Send `artifact:created` SSE (NO preview URL)
2. Generate preview async → Upload to S3 → Update artifact metadata

matthew-gerstman

Design System v2: Classname Helpers

A token-conscious approach using type-safe classname utilities instead of component wrappers for layout primitives.

---

Core Principle

Components for behavior. Classnames for styling.

matthew-gerstman

import React from 'react';
import './App.css';

class App extends React.Component {
  state = {anonymousFunctions: true, count: 100};
  updateCount = e => {
    this.setState({count: e.target.value});
  };
  updateAnonymous = () => {
    this.setState({anonymousFunctions: !this.state.anonymousFunctions});

matthew-gerstman

let lastFocused = [];
setInterval(() => {
  const focused = document.querySelector(':focus');
  if (focused && lastFocused[lastFocused.length - 1] != focused) {
    lastFocused.push(focused);
  }
}, 100)

matthew-gerstman

function handleAsManyLicenseCases(data, licenseID) {
  const returnableLicense = {
    allLicenses: [],
    licenseStatement: licenseID,
    spdx: {
      osi: false,
      fsf: false,
      fsfAndOsi: false,
      deprecated: false,
    },

matthew-gerstman

function filter(list, predicate) {
  return list.reduce((acc, item) => {
    if (predicate(item)) {
      acc.push(item);
    }
    return acc;
  }, []);
}

matthew-gerstman

function map(list, func) {
  return list.reduce((acc, item) => {
    acc.push(func(item));
    return acc;
  }, []);
}

matthew-gerstman

[
  "Harry Potter",
  "Gryffindor",
  40,
  "Hermione Granger",
  "Gryffindor",
  140,
  "Draco Malfoy",
  "Slytherin",
  -20,