/**
 * Type guards and coercion helpers shared by all bridge adapters.
 *
 * Adapters treat the bridge payload as `unknown` and validate field-by-field
 * here so a bridge schema drift (renamed field, lost serde rename_all,
 * timestamp serializer change) surfaces as `null` from one adapter instead
 * of a silent type lie that propagates downstream.
 */
/**
 * Plain-object guard. `typeof null === "object"` so we exclude it
 * explicitly; arrays return `true` here so callers must check
 * `Array.isArray` first if they need to distinguish.
 */
export declare const isObject: (x: unknown) => x is Record<string, unknown>;
/** Treat any non-string as missing rather than coercing (no `String(x)`). */
export declare const asString: (x: unknown) => string | undefined;
/** Treat any non-number (including booleans, NaN) as missing. */
export declare const asNumber: (x: unknown) => number | undefined;
/** Strict bool — does not coerce truthy values like `1` or `'true'`. */
export declare const asBool: (x: unknown) => boolean | undefined;
/** Same as `asBool` but defaults to `false` for missing/invalid input. */
export declare const asBoolOr: (x: unknown, fallback: boolean) => boolean;
/**
 * Bridge JID struct — `user@server`, plus optional `agent`/`device`/
 * `integrator` for multi-device addressing. We always drop the latter when
 * stringifying so canonical JIDs are device-stripped (matching how Baileys
 * consumers index and compare).
 */
export interface BridgeJid {
    user: string;
    server: string;
    agent?: number;
    device?: number;
    integrator?: number;
}
/** Type guard for the bridge's `Jid` shape. Required fields only. */
export declare const isBridgeJid: (x: unknown) => x is BridgeJid;
/** `null`-tolerant `BridgeJid` extractor — bridge payloads sometimes carry `null`. */
export declare const asBridgeJid: (x: unknown) => BridgeJid | undefined;
/** Stringify a bridge JID into the canonical `user@server` form. Drops device/agent. */
export declare const bridgeJidToString: (j: BridgeJid) => string;
/** Combined: validate & stringify in one step. Returns `undefined` on invalid input. */
export declare const asJidString: (x: unknown) => string | undefined;
/**
 * Coerce a timestamp value into unix seconds. Accepts both numbers and ISO
 * strings — the bridge serializes `DateTime<Utc>` as ISO unless explicitly
 * typed with `ts_seconds`, so being lenient here insulates us from drift.
 */
export declare const toUnixSeconds: (raw: unknown) => number;
/**
 * Lowercase a discriminator string defensively — handles both the current
 * lowercase wire-tag form and any legacy PascalCase form an older bridge
 * might still emit.
 */
export declare const normalizeDiscriminator: (x: unknown) => string | undefined;
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