import type { WorkflowProgressData, WorkflowUpdateInput, WorkflowUpdateReceipt, WorkflowUpdateRecord } from "./types.js";
export declare const MAX_UPDATE_DATA_BYTES: number;
export declare const MAX_CURRENT_UPDATES = 1024;
export declare const UPDATE_RATE_PER_SECOND = 20;
export declare const UPDATE_RATE_BURST = 100;
export declare function validateWorkflowUpdate(input: unknown): WorkflowUpdateInput;
export declare function validateProgressData(data: Record<string, unknown>): WorkflowProgressData;
export declare function updateProjection(current: WorkflowUpdateRecord[] | undefined, record: WorkflowUpdateRecord): WorkflowUpdateRecord[];
export declare function createUpdateId(): string;
export declare function updateReceipt(record: WorkflowUpdateRecord): WorkflowUpdateReceipt;
export declare class UpdateRateLimiter {
    private tokens;
    private lastMs;
    take(nowMs?: number): void;
}