Preact Example: UseHotkeySequences

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import React from 'preact/compat'
import { render } from 'preact'
import {
  HotkeysProvider,
  formatForDisplay,
  useHotkey,
  useHotkeyRegistrations,
  useHotkeySequences,
} from '@tanstack/preact-hotkeys'
import { hotkeysDevtoolsPlugin } from '@tanstack/preact-hotkeys-devtools'
import { TanStackDevtools } from '@tanstack/preact-devtools'
import './index.css'

function App() {
  const [lastSequence, setLastSequence] = React.useState<string | null>(null)
  const [history, setHistory] = React.useState<Array<string>>([])
  const [helloSequenceEnabled, setHelloSequenceEnabled] = React.useState(true)

  const addToHistory = (action: string) => {
    setLastSequence(action)
    setHistory((h) => [...h.slice(-9), action])
  }

  useHotkeySequences([
    {
      sequence: ['G', 'G'],
      callback: () => addToHistory('gg → Go to top'),
      options: {
        meta: {
          name: 'Go to top',
          description: 'Scroll to the beginning of the document',
        },
      },
    },
    {
      sequence: ['Shift+G'],
      callback: () => addToHistory('G → Go to bottom'),
      options: {
        meta: {
          name: 'Go to bottom',
          description: 'Scroll to the end of the document',
        },
      },
    },
    {
      sequence: ['D', 'D'],
      callback: () => addToHistory('dd → Delete line'),
      options: {
        meta: { name: 'Delete line', description: 'Delete the current line' },
      },
    },
    {
      sequence: ['Y', 'Y'],
      callback: () => addToHistory('yy → Yank (copy) line'),
      options: {
        meta: {
          name: 'Yank line',
          description: 'Copy the current line to clipboard',
        },
      },
    },
    {
      sequence: ['D', 'W'],
      callback: () => addToHistory('dw → Delete word'),
      options: {
        meta: {
          name: 'Delete word',
          description: 'Delete from cursor to end of word',
        },
      },
    },
    {
      sequence: ['C', 'I', 'W'],
      callback: () => addToHistory('ciw → Change inner word'),
      options: {
        meta: {
          name: 'Change inner word',
          description: 'Delete word under cursor and enter insert mode',
        },
      },
    },
    {
      sequence: ['ArrowUp', 'ArrowUp', 'ArrowDown', 'ArrowDown'],
      callback: () => addToHistory('↑↑↓↓ → Konami code (partial)'),
      options: {
        timeout: 1500,
        meta: {
          name: 'Konami code',
          description: 'Partial Konami code using arrow keys',
        },
      },
    },
    {
      sequence: ['ArrowLeft', 'ArrowRight', 'ArrowLeft', 'ArrowRight'],
      callback: () => addToHistory('←→←→ → Side to side!'),
      options: {
        timeout: 1500,
        meta: {
          name: 'Side to side',
          description: 'Left-right-left-right arrow pattern',
        },
      },
    },
    {
      sequence: ['H', 'E', 'L', 'L', 'O'],
      callback: () => addToHistory('hello → Hello World!'),
      options: {
        enabled: helloSequenceEnabled,
        meta: { name: 'Hello', description: 'Spell out hello to trigger' },
      },
    },
    {
      sequence: ['Shift+R', 'Shift+T'],
      callback: () => addToHistory('⇧R ⇧T → Chained Shift+letter (2 steps)'),
      options: {
        meta: {
          name: 'Chained Shift',
          description: 'Two consecutive Shift+letter chords',
        },
      },
    },
  ])

  // Clear history with Escape
  useHotkey('Escape', () => {
    setLastSequence(null)
    setHistory([])
  })

  return (
    <div className="app">
      <header>
        <h1>useHotkeySequences</h1>
        <p>
          Register many multi-key sequences in one hook (like Vim commands).
          Keys must be pressed within the timeout window (default: 1000ms).
        </p>
      </header>

      <main>
        <section className="demo-section">
          <h2>Vim-Style Commands</h2>
          <table className="sequence-table">
            <thead>
              <tr>
                <th>Sequence</th>
                <th>Action</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td>
                  <kbd>g</kbd> <kbd>g</kbd>
                </td>
                <td>Go to top</td>
              </tr>
              <tr>
                <td>
                  <kbd>G</kbd> (Shift+G)
                </td>
                <td>Go to bottom</td>
              </tr>
              <tr>
                <td>
                  <kbd>d</kbd> <kbd>d</kbd>
                </td>
                <td>Delete line</td>
              </tr>
              <tr>
                <td>
                  <kbd>y</kbd> <kbd>y</kbd>
                </td>
                <td>Yank (copy) line</td>
              </tr>
              <tr>
                <td>
                  <kbd>d</kbd> <kbd>w</kbd>
                </td>
                <td>Delete word</td>
              </tr>
              <tr>
                <td>
                  <kbd>c</kbd> <kbd>i</kbd> <kbd>w</kbd>
                </td>
                <td>Change inner word</td>
              </tr>
            </tbody>
          </table>
        </section>

        <section className="demo-section">
          <h2>Fun Sequences</h2>
          <div className="fun-sequences">
            <div className="sequence-card">
              <h3>Konami Code (Partial)</h3>
              <p>
                <kbd>↑</kbd> <kbd>↑</kbd> <kbd>↓</kbd> <kbd>↓</kbd>
              </p>
              <span className="hint">Use arrow keys within 1.5 seconds</span>
            </div>
            <div className="sequence-card">
              <h3>Side to Side</h3>
              <p>
                <kbd>←</kbd> <kbd>→</kbd> <kbd>←</kbd> <kbd>→</kbd>
              </p>
              <span className="hint">Arrow keys within 1.5 seconds</span>
            </div>
            <div className="sequence-card">
              <h3>Spell It Out</h3>
              <p>
                <kbd>h</kbd> <kbd>e</kbd> <kbd>l</kbd> <kbd>l</kbd> <kbd>o</kbd>
              </p>
              <span className="hint">Type "hello" quickly</span>
              <p className="sequence-toggle-status">
                This sequence is{' '}
                <strong>{helloSequenceEnabled ? 'enabled' : 'disabled'}</strong>
                .
              </p>
              <button
                type="button"
                onClick={() => setHelloSequenceEnabled((v) => !v)}
              >
                {helloSequenceEnabled ? 'Disable' : 'Enable'} sequence
              </button>
            </div>
          </div>
        </section>

        {lastSequence && (
          <div className="info-box success">
            <strong>Triggered:</strong> {lastSequence}
          </div>
        )}

        <section className="demo-section">
          <h2>Input handling</h2>
          <p>
            Sequences are not detected when typing in text inputs, textareas,
            selects, or contenteditable elements. Button-type inputs (
            <code>type="button"</code>, <code>submit</code>, <code>reset</code>)
            still receive sequences. Focus the input below and try <kbd>g</kbd>{' '}
            <kbd>g</kbd> or <kbd>h</kbd>
            <kbd>e</kbd>
            <kbd>l</kbd>
            <kbd>l</kbd>
            <kbd>o</kbd> — nothing will trigger. Click outside to try again.
          </p>
          <input
            type="text"
            className="demo-input"
            placeholder="Focus here – sequences won't trigger while typing..."
          />
        </section>

        <section className="demo-section">
          <h2>Chained Shift+letter sequences</h2>
          <p>
            Each step is a chord: hold <kbd>Shift</kbd> and press a letter. You
            can press <kbd>Shift</kbd> alone between steps—those modifier-only
            presses do not reset progress, so the next chord still counts.
          </p>
          <table className="sequence-table">
            <thead>
              <tr>
                <th>Sequence</th>
                <th>Action</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td>
                  <kbd>Shift</kbd>+<kbd>r</kbd> then <kbd>Shift</kbd>+
                  <kbd>t</kbd>
                </td>
                <td>Chained Shift+letter (2 steps)</td>
              </tr>
            </tbody>
          </table>
        </section>

        <RegistrationsViewer />

        <section className="demo-section">
          <h2>Usage</h2>
          <pre className="code-block">{`import { useHotkeySequences, useHotkeyRegistrations } from '@tanstack/preact-hotkeys'

function VimEditor() {
  useHotkeySequences([
    {
      sequence: ['G', 'G'],
      callback: () => scrollToTop(),
      options: { meta: { name: 'Go to top', description: 'Scroll to top' } },
    },
    {
      sequence: ['C', 'I', 'W'],
      callback: () => changeInnerWord(),
      options: { meta: { name: 'Change inner word' } },
    },
  ])

  // Introspect all registrations
  const { sequences } = useHotkeyRegistrations()
  // sequences[0].options.meta?.name → 'Go to top'
  // sequences[0].triggerCount → 3
}`}</pre>
        </section>

        {history.length > 0 && (
          <section className="demo-section">
            <h2>History</h2>
            <ul className="history-list">
              {history.map((item, i) => (
                <li key={i}>{item}</li>
              ))}
            </ul>
            <button onClick={() => setHistory([])}>Clear History</button>
          </section>
        )}

        <p className="hint">
          Press <kbd>Escape</kbd> to clear history
        </p>
      </main>

      <TanStackDevtools plugins={[hotkeysDevtoolsPlugin()]} />
    </div>
  )
}

// ---------------------------------------------------------------------------
// Live registrations viewer using useHotkeyRegistrations
// ---------------------------------------------------------------------------

function RegistrationsViewer() {
  const { hotkeys, sequences } = useHotkeyRegistrations()

  return (
    <section className="demo-section">
      <h2>Live Registrations (useHotkeyRegistrations)</h2>
      <p>
        This table is rendered from <code>useHotkeyRegistrations()</code> — a
        reactive view of all registered hotkeys and sequences. Trigger counts
        update in real-time.
      </p>

      {hotkeys.length > 0 && (
        <>
          <h3>Hotkeys</h3>
          <table className="registrations-table">
            <thead>
              <tr>
                <th>Hotkey</th>
                <th>Name</th>
                <th>Description</th>
                <th>Triggers</th>
              </tr>
            </thead>
            <tbody>
              {hotkeys.map((reg) => (
                <tr key={reg.id}>
                  <td>
                    <kbd>{formatForDisplay(reg.hotkey)}</kbd>
                  </td>
                  <td>{reg.options.meta?.name ?? '—'}</td>
                  <td className="description-cell">
                    {reg.options.meta?.description ?? '—'}
                  </td>
                  <td className="trigger-count">{reg.triggerCount}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </>
      )}

      <h3>Sequences ({sequences.length})</h3>
      <table className="registrations-table">
        <thead>
          <tr>
            <th>Sequence</th>
            <th>Name</th>
            <th>Description</th>
            <th>Enabled</th>
            <th>Triggers</th>
          </tr>
        </thead>
        <tbody>
          {sequences.map((reg) => (
            <tr key={reg.id}>
              <td>
                {reg.sequence.map((s, i) => (
                  <React.Fragment key={i}>
                    {i > 0 && ' '}
                    <kbd>{formatForDisplay(s)}</kbd>
                  </React.Fragment>
                ))}
              </td>
              <td>{reg.options.meta?.name ?? '—'}</td>
              <td className="description-cell">
                {reg.options.meta?.description ?? '—'}
              </td>
              <td>
                <span
                  className={
                    reg.options.enabled !== false ? 'status-on' : 'status-off'
                  }
                >
                  {reg.options.enabled !== false ? 'yes' : 'no'}
                </span>
              </td>
              <td className="trigger-count">{reg.triggerCount}</td>
            </tr>
          ))}
          {sequences.length === 0 && (
            <tr>
              <td colSpan={5} className="hint">
                No sequences registered
              </td>
            </tr>
          )}
        </tbody>
      </table>
    </section>
  )
}

// TanStackDevtools as sibling of App to avoid Preact hook errors when hotkeys update state
const devtoolsPlugins = [hotkeysDevtoolsPlugin()]

render(
  <HotkeysProvider>
    <App />
    <TanStackDevtools plugins={devtoolsPlugins} />
  </HotkeysProvider>,
  document.getElementById('root')!,
)