/** Minimum ctx shape the chat-type predicates read: `chat` on message-flavoured ctxs,
 *  `message.chat` on callback ctxs (which have no `chat`). */
export type ChatTypeCtx = {
    chat?: {
        type?: string;
    };
    message?: {
        chat?: {
            type?: string;
        };
    };
};
/** Minimum ctx shape {@link chatIdOf} reads: `chat` (message ctxs), or `chatId` /
 *  `message.chat` (callback ctxs). */
export type ChatIdCtx = {
    chat?: {
        id?: number;
    };
    chatId?: number;
    message?: {
        chat?: {
            id?: number;
        };
    };
};
/** Minimum ctx shape `isGroupAdmin` reads. `bot` is the running gramio Bot — typed
 *  `unknown` so MenuCtx and every real ctx assign without a cast; its
 *  `api.getChatAdministrators` is asserted at call time. `senderChat` is the
 *  anonymous-admin identity on message ctxs (callback ctxs have none). */
export type GroupAdminCtx = ChatIdCtx & {
    bot: unknown;
    from?: {
        id?: number;
    };
    senderChat?: {
        id?: number;
    };
};
/** The ctx's chat id, whatever the event spelling. `undefined` only when the event has
 *  no chat at all (inline queries, some service events). */
export declare const chatIdOf: (ctx: ChatIdCtx) => number | undefined;
/** True for a group or supergroup chat. */
export declare const isGroupChat: (ctx: ChatTypeCtx) => boolean;
/** True for a 1:1 private chat. */
export declare const isPrivateChat: (ctx: ChatTypeCtx) => boolean;
/**
 * Whether a user is a creator/administrator of a group, per `getChatAdministrators`
 * membership. Chat and user default to the ctx's own ({@link chatIdOf}, `ctx.from.id` —
 * gramio's own parameter-defaulting idiom); pass `chatId` / `userId` for cross-chat
 * checks. An anonymous admin's own message (`senderChat` = the chat itself) answers
 * `true` without an API call — unless an explicit `userId` asks about someone else.
 * Missing ids (an actor-less service event) or an API rejection answer `false`.
 */
export declare function isGroupAdmin(ctx: GroupAdminCtx, opts?: {
    chatId?: number;
    userId?: number;
}): Promise<boolean>;
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