/**
 * Control+Tab in the desktop app: switch between recently viewed chats, most
 * recent first, as ⌘Tab switches apps. The list spans the person's workspaces,
 * so it also jumps between chats in different workspaces. A quick press goes back to the previous
 * chat (press again to return); holding Control shows the list, each Tab moves
 * down it (Shift+Tab up), and releasing Control opens the highlighted chat.
 *
 * The list is read once when the switcher opens, so it holds still while the
 * person cycles through it.
 */
import type { ChatDirectorySnapshot } from "./chat-directory.js";
/** At most this many chats; older ones are a search away in ⌘K. */
export declare const SWITCHER_LIMIT = 10;
/** A press shorter than this switches without ever drawing the list. */
export declare const SWITCHER_SHOW_DELAY_MS = 140;
export type ChatSwitcherState = Readonly<{
    /** Chats in the order shown, most recently viewed first. */
    ids: readonly string[];
    /** The highlighted chat. */
    index: number;
    /** Whether the list is drawn (after the delay, or once Tab is pressed again). */
    visible: boolean;
}>;
/**
 * The chats to switch between, most recently viewed first, with the open chat
 * (when there is one) at the front. Null when there is nowhere to switch to.
 */
export declare function openChatSwitcher(directory: Pick<ChatDirectorySnapshot, "recent" | "rows">, currentChatId: string | null, backwards: boolean, 
/** Whether a workspace is still open to the person; chats elsewhere are left out. */
reachable?: (workspaceId: string) => boolean): ChatSwitcherState | null;
/** Tab moves down the list and Shift+Tab up, wrapping at the ends. */
export declare function stepChatSwitcher(state: ChatSwitcherState, step: 1 | -1): ChatSwitcherState;
/** Control+Tab exactly: no ⌘, no ⌥ (Shift reverses). */
export declare function isSwitcherKey(event: Pick<KeyboardEvent, "code" | "ctrlKey" | "metaKey" | "altKey">): boolean;