import { EventEmitter } from "eventemitter3";
import { MessageContents, OpenDocMessage, RepoMessage } from "../network/messages.js";
import { SyncState } from "@automerge/automerge/slim";
import { PeerId, DocumentId } from "../types.js";
export declare abstract class Synchronizer extends EventEmitter<SynchronizerEvents> {
    abstract receiveMessage(message: RepoMessage): void;
}
export interface SynchronizerEvents {
    message: (payload: MessageContents) => void;
    "sync-state": (payload: SyncStatePayload) => void;
    "open-doc": (arg: OpenDocMessage) => void;
    metrics: (arg: DocSyncMetrics) => void;
}
/** Notify the repo that the sync state has changed  */
export interface SyncStatePayload {
    peerId: PeerId;
    documentId: DocumentId;
    syncState: SyncState;
}
export type DocSyncMetrics = {
    type: "receive-sync-message";
    documentId: DocumentId;
    durationMillis: number;
    numOps: number;
    numChanges: number;
} | {
    type: "doc-denied";
    documentId: DocumentId;
};
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