OpenTUI/React Quick Reference

OpenTUI is a React renderer for terminal UIs using Yoga layout (like React Native). NOT React DOM or Ink.

Version Info

• Current: 0.1.69 (updated), Latest: 0.1.69
• Context repo: .context/repos/opentui (run bun run sync-context if missing)

Core Imports

import { useKeyboard, useRenderer, useTerminalDimensions } from "@opentui/react";
import type { ScrollBoxRenderable, KeyEvent } from "@opentui/core";

JSX Elements (Lowercase!)

// CORRECT - OpenTUI intrinsics
<box style={{ flexDirection: "column" }}>
  <text fg="#ffffff">Hello</text>
  <scrollbox ref={scrollRef} focused />
</box>

// WRONG - Not OpenTUI
<div>, <span>, <Box>, <Text>

Critical Rules

1. Text Only Accepts Strings

// WRONG - Cannot nest elements in <text>
<text>Hello <text fg="red">world</text></text>

// CORRECT - Use row box for inline styling
<box style={{ flexDirection: "row" }}>
  <text>Hello </text>
  <text fg="red">world</text>
</box>

2. Always Check focused in Keyboard Handlers

useKeyboard((key) => {
  if (!focused) return;  // MUST check first!
  if (key.name === "j") moveDown();
});

3. Save Scroll Position Synchronously

// WRONG - useEffect runs after render, scroll already reset
useEffect(() => { if (!focused) savedScroll.current = scrollRef.current?.scrollTop; }, [focused]);

// CORRECT - Save before state change
const handleSelect = () => {
  savedScroll.current = scrollRef.current?.scrollTop;  // Save first!
  onSelect(item);
};

Hyperlinks (New in 0.1.64+)

<text>
  Visit <a href="https://example.com">example.com</a> for more
</text>

Renders clickable links in terminals supporting OSC8 (iTerm2, Kitty, etc.).

Key Names

Scrollbox API

const scrollbox = scrollRef.current;
scrollbox.scrollTop           // Current position
scrollbox.scrollHeight        // Total content height
scrollbox.viewport.height     // Visible area
scrollbox.scrollTo(pos)       // Absolute scroll
scrollbox.scrollBy(delta)     // Relative scroll
scrollbox.getChildren()       // Find elements by ID

Common Layout Patterns

// Full-height with fixed header/footer
<box style={{ flexDirection: "column", height: "100%" }}>
  <box style={{ flexShrink: 0 }}>{/* Header */}</box>
  <scrollbox style={{ flexGrow: 1 }}>{/* Content */}</scrollbox>
  <box style={{ flexShrink: 0 }}>{/* Footer */}</box>
</box>

// Prevent unwanted spacing (Yoga quirk)
<box style={{ justifyContent: "flex-start", marginBottom: 0, paddingBottom: 0 }}>

React DevTools (Optional)

bun add --dev react-devtools-core@7
npx react-devtools@7  # Start standalone devtools
DEV=true bun run start  # Run app with devtools enabled

Detailed References

• COMPONENTS.md - JSX elements, styling, text nesting
• KEYBOARD.md - Keyboard handling, key names, focus patterns
• SCROLLBOX.md - Scrollbox API, scroll preservation, windowed lists
• LAYOUT.md - Flex layout, Yoga engine, spacing issues
• PATTERNS.md - Screen navigation, state preservation, library compatibility

xfeed Reference Files

• src/app.tsx - Screen routing, navigation history
• src/components/PostList.tsx - Scrollbox with preservation
• src/components/PostCard.tsx - Component styling, mouse handling
• src/modals/FolderPicker.tsx - Windowed list pattern
• src/hooks/useListNavigation.ts - Vim-style navigation