import { phase0, SyncPeriod } from "@chainsafe/lodestar-types";
export declare enum LightclientEvent {
    /**
     * New head
     */
    head = "head",
    /**
     * New finalized
     */
    finalized = "finalized",
    /**
     * Stored nextSyncCommittee from an update at period `period`.
     * Note: the SyncCommittee is stored for `period + 1`.
     */
    committee = "committee"
}
export declare type LightclientEvents = {
    [LightclientEvent.head]: (newHeader: phase0.BeaconBlockHeader) => void;
    [LightclientEvent.finalized]: (newHeader: phase0.BeaconBlockHeader) => void;
    [LightclientEvent.committee]: (updatePeriod: SyncPeriod) => void;
};
export declare type LightclientEmitter = MittEmitter<LightclientEvents>;
export declare type MittEmitter<T extends Record<string, (...args: any[]) => void>> = {
    on<K extends keyof T>(type: K, handler: T[K]): void;
    off<K extends keyof T>(type: K, handler: T[K]): void;
    emit<K extends keyof T>(type: K, ...args: Parameters<T[K]>): void;
};
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