import { Package } from "./Package";
export declare const EMPTY_FUNCTION: () => void;
export declare type Writable<T> = {
    -readonly [P in keyof T]: T[P];
};
export declare const RESOLVED_PROMISE: Promise<void>;
export declare const MAX_UINT_32 = 4294967295;
export declare const MAX_SUPPORTED_ARRAY_BUFFER_SIZE: number;
export declare type CorkFunction = (callback: () => void) => void;
export declare type GroupCorkFunction = (group: string, callback: () => void) => void;
export declare type GroupSendFunction = (group: string, msg: ArrayBuffer | string, binary?: boolean, batch?: boolean) => void;
export declare type SendFunction = (msg: ArrayBuffer | string, binary?: boolean, batch?: boolean) => void;
export declare type MultiSendFunction = (messages: (ArrayBuffer | string)[], batches: boolean) => void;
export declare function loadDefaults<T>(options: Partial<T>, defaults: T): T;
export declare function estimateMaxUTF8Size(str: string): number;
export declare function escapeJSONString(str: string): string;
export declare function escapePlaceholderSequence(key: string): string;
export declare function unescapePlaceholderSequence(key: string): string;
export declare function sendPackage(pack: Package, send: SendFunction): void;