import type { IncrementalUnit, IncrementalUnitId, IuState } from "./incremental-unit.js";
export interface IuLedger {
    add(iu: IncrementalUnit): void;
    commit(id: IncrementalUnitId, prefix?: {
        chars?: number;
        ms?: number;
    }): void;
    revoke(id: IncrementalUnitId): void;
    get(id: IncrementalUnitId): IncrementalUnit | undefined;
    latest(contextId: string, kind: IncrementalUnit["kind"]): IncrementalUnit | undefined;
    clear(contextId: string): void;
}
export type IuLedgerAnomaly = {
    readonly kind: "terminal_op";
    readonly op: "commit" | "revoke";
    readonly id: IncrementalUnitId;
    readonly state: IuState;
} | {
    readonly kind: "unknown_iu";
    readonly op: "commit" | "revoke";
    readonly id: IncrementalUnitId;
};
export declare class InMemoryIuLedger implements IuLedger {
    private readonly onEvent;
    private readonly maxContexts;
    private readonly byCtx;
    constructor(onEvent?: (a: IuLedgerAnomaly) => void, maxContexts?: number);
    add(iu: IncrementalUnit): void;
    commit(id: IncrementalUnitId, prefix?: {
        chars?: number;
        ms?: number;
    }): void;
    revoke(id: IncrementalUnitId): void;
    get(id: IncrementalUnitId): IncrementalUnit | undefined;
    latest(contextId: string, kind: IncrementalUnit["kind"]): IncrementalUnit | undefined;
    clear(contextId: string): void;
    private ctxMap;
}
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