/**
 * Tiny structural helpers for reading untyped JSON — the shape every raw
 * Feishu event payload arrives in. Used across the event parsers, which
 * decode their payloads defensively. `isRecord`/`asString` are ported
 * verbatim from claudemux.
 */
/** True when `v` is a non-null object, and therefore safe to index. */
export declare function isRecord(v: unknown): v is Record<string, unknown>;
/** `v` when it is a string, otherwise the empty string. */
export declare function asString(v: unknown): string;
/**
 * `v` narrowed to a plain object, excluding arrays — every event field this
 * package reads by key expects an object, not a list.
 */
export declare function asRecord(v: unknown): Record<string, unknown> | undefined;
/** The first string among `values`, or the empty string when none is one. */
export declare function firstString(...values: unknown[]): string;
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