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

type AppState = {
  /** Which top-level screen is showing. */
  view: 'status' | 'picker' | '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;
  /** The theme actually in force, once 'system' has been resolved. */
  theme?: 'light' | 'dark';
};