/**
 * Reads the `type` field off an inbound bridge message, if any.
 *
 * Used by both sides of the bridge after the canonical message schema rejects a payload. We still
 * want to know what type the sender claimed to be sending so we can (a) avoid NACK loops on
 * `invalidHostMessage` / `invalidSandboxMessage` and (b) include the type in the failure reason
 * for debugging.
 */
export declare function readIncomingType(data: unknown): string | undefined;
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