export type QuotaScope = "user" | "server";
export declare class QuotaExceededError extends Error {
    readonly scope: QuotaScope;
    readonly limit: number;
    constructor(scope: QuotaScope, limit: number);
}
export interface QuotaReservation {
    id: string;
    ownerUserId: string;
    bytes: number;
    state: "reserved" | "committed";
}
/** A distributed deployment can replace this with a transactional shared ledger. */
export interface FileQuotaPolicy {
    reserve(input: {
        id: string;
        ownerUserId: string;
        bytes: number;
    }): Promise<void>;
    resizeReservation(id: string, actualBytes: number): Promise<void>;
    commit(id: string, actualBytes: number): Promise<void>;
    release(id: string): Promise<void>;
    reconcileCommitted(files: Iterable<{
        id: string;
        ownerUserId: string;
        bytes: number;
    }>): Promise<void>;
}
export declare class LocalFileQuotaPolicy implements FileQuotaPolicy {
    private readonly limits;
    private readonly committedBytes;
    private readonly metadataDirectory;
    private readonly ledgerPath;
    private readonly lockPath;
    private queue;
    constructor(directory: string, limits: {
        perUserBytes: number;
        serverBytes: number;
    }, committedBytes: () => Promise<number>);
    reserve(input: {
        id: string;
        ownerUserId: string;
        bytes: number;
    }): Promise<void>;
    resizeReservation(id: string, actualBytes: number): Promise<void>;
    commit(id: string, actualBytes: number): Promise<void>;
    release(id: string): Promise<void>;
    reconcileCommitted(files: Iterable<{
        id: string;
        ownerUserId: string;
        bytes: number;
    }>): Promise<void>;
    private assertCapacity;
    private update;
    private readLedger;
    private serialized;
}
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