import { Metadata } from '../Metadata';
/**
 * Call options accepted by client methods.
 */
export type CallOptions = {
    /**
     * Request metadata.
     */
    metadata?: Metadata;
    /**
     * Signal that cancels the call once aborted.
     */
    signal?: AbortSignal;
    /**
     * Called when header is received.
     */
    onHeader?(header: Metadata): void;
    /**
     * Called when trailer is received.
     */
    onTrailer?(trailer: Metadata): void;
};