import { ForkName } from "@lodestar/params";
import { LightClientBootstrap, LightClientFinalityUpdate, LightClientOptimisticUpdate, LightClientUpdate, SyncPeriod } from "@lodestar/types";
export interface LightClientTransport {
    getUpdates(startPeriod: SyncPeriod, count: number): Promise<{
        version: ForkName;
        data: LightClientUpdate;
    }[]>;
    /**
     * Returns the latest optimistic head update available. Clients should use the SSE type `light_client_optimistic_update`
     * unless to get the very first head update after syncing, or if SSE are not supported by the server.
     */
    getOptimisticUpdate(): Promise<{
        version: ForkName;
        data: LightClientOptimisticUpdate;
    }>;
    getFinalityUpdate(): Promise<{
        version: ForkName;
        data: LightClientFinalityUpdate;
    }>;
    /**
     * Fetch a bootstrapping state with a proof to a trusted block root.
     * The trusted block root should be fetched with similar means to a weak subjectivity checkpoint.
     * Only block roots for checkpoints are guaranteed to be available.
     */
    getBootstrap(blockRoot: string): Promise<{
        version: ForkName;
        data: LightClientBootstrap;
    }>;
    onOptimisticUpdate(handler: (optimisticUpdate: LightClientOptimisticUpdate) => void): void;
    onFinalityUpdate(handler: (finalityUpdate: LightClientFinalityUpdate) => void): void;
}
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