type LogEntry = {
  id: number;
  message: string;
  kind: 'info' | 'warn' | 'error';
  at: number;
};

type AppState = {
  /**
   * Which top-level screen is showing. 'searching' auto-retries in the
   * background; 'permission' is the one-off WebUSB grant, which the browser
   * will not let us trigger without a click.
   */
  view: 'status' | 'searching' | 'permission' | 'ready';
  /** Shown while `view` is 'status'. */
  message?: string;
  config?: import('web-gphoto2').Config;
  supportedOps?: import('web-gphoto2').SupportedOps;
  prefs: import('./settings.js').Prefs;
  seq: import('./intervalometer.js').SequenceState;
  log: LogEntry[];
  settingsOpen: boolean;
  singleShotStatus: 'idle' | 'busy';
  /** Whether the preview pane is currently filling the screen. */
  fullscreen?: boolean;
};