/**
 * The bot's native slash-command panel. Feishu shows a chooser when a user
 * types `/`, built from commands registered on the APP rather than sent in a
 * message, so a chat only discovers what this channel accepts if the panel is
 * kept in step with it.
 *
 * The sync reconciles: it creates what the panel is missing and removes what
 * this channel no longer offers. An additive-only sync was tried first, on the
 * reasoning that the panel belongs to the app and a human might have curated
 * it. Drift turned out to be the real cost — a command removed from the channel
 * stayed in the menu and answered "unknown command" for everyone who picked it
 * — while a deployment that does curate its own menu has `syncSlashCommands`
 * to turn this off.
 * @module dsh-lark-channel/slash-panel
 */
/** One command already registered on the app. */
export interface PanelCommand {
    readonly command: string;
    readonly commandId: string;
}
/** The panel operations this sync needs from the transport. */
export interface SlashPanelPort {
    /** Every command currently registered on the app. */
    listSlashCommands(): Promise<PanelCommand[]>;
    /** Register one command; the platform rejects a duplicate name. */
    createSlashCommand(command: string, description: string): Promise<void>;
    /** Remove one command by the id the listing gave it. */
    deleteSlashCommand(commandId: string): Promise<void>;
}
/** One command this channel wants the panel to offer. */
export interface DesiredCommand {
    readonly name: string;
    readonly description: string;
}
/** What one reconciliation changed, for the caller to report. */
export interface PanelSync {
    readonly added: string[];
    readonly removed: string[];
}
/**
 * Make the panel offer exactly what this channel accepts.
 * @param port - the panel operations.
 * @param desired - what this channel accepts.
 * @param notify - operator console line.
 * @returns the names added and removed.
 */
export declare function syncSlashPanel(port: SlashPanelPort, desired: readonly DesiredCommand[], notify: (line: string) => void): Promise<PanelSync>;
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