/**
 * Decoding the `im.chat.member.bot.added_v1` event envelope.
 *
 * Hosts use this event to notice when the Feishu bot is added to a chat. The
 * decode is deliberately narrow and pure: it only extracts stable envelope
 * identifiers, performs no I/O, and returns `null` for unroutable payloads.
 */
/** The Feishu event_type this decoder is for. */
export declare const BOT_MEMBER_ADDED_EVENT_TYPE = "im.chat.member.bot.added_v1";
/** A normalized bot-added event — the identifying fields the payload carries. */
export interface FeishuBotMemberAddedEvent {
    /** Chat id the bot was added to. */
    chatId: string;
    /** Feishu event id from the header, empty when the host passes a bare event. */
    eventId: string;
}
/**
 * Reshape a raw `im.chat.member.bot.added_v1` payload into a
 * `FeishuBotMemberAddedEvent`. Tolerates either a full `{ header, event }`
 * envelope or the bare event body delivered by some host adapters. Pure: no
 * I/O, never throws.
 */
export declare function normalizeBotMemberAddedEvent(raw: unknown): FeishuBotMemberAddedEvent | null;
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