import { type IControllerDraftAttachment, type IControllerSessionDraft, type IControllerSessionDraftUpdate } from '../dist_ts_interfaces/interfaces.js';
export declare class ControllerDraftConflictError extends Error {
    readonly draft: IControllerSessionDraft;
    constructor(draft: IControllerSessionDraft);
}
export declare class ControllerDraftLimitError extends Error {
    constructor(messageArg: string);
}
export interface IControllerDraftMutationResult {
    draft: IControllerSessionDraft;
    update?: IControllerSessionDraftUpdate;
}
export declare class ControllerDraftManager {
    private readonly drafts;
    private nonEmptyDrafts;
    private aggregateAttachmentBytes;
    get(keyArg: string): IControllerSessionDraft;
    update(keyArg: string, expectedRevisionArg: number, patchArg: {
        text?: string;
        attachments?: readonly IControllerDraftAttachment[];
    }): IControllerDraftMutationResult;
    snapshot(keyArg: string, revisionArg: number): IControllerSessionDraft;
    clearExact(keyArg: string, revisionArg: number): IControllerDraftMutationResult;
    purge(keyArg: string): void;
    purgePrefix(prefixArg: string): void;
    clear(): void;
    private assertDraftFields;
    private assertAdmission;
    private store;
}