export type PromiseHandle<T> = {
    resolve: (value: T | PromiseLike<T>) => void;
    reject: (reason?: unknown) => void;
    promise: Promise<T>;
};
export declare function promiseCreator<T>(): PromiseHandle<T>;
export declare const sleep: (ms: number) => Promise<unknown>;
export declare const formatPublicKey: (publicKey: string) => string;
export type PublicKeyValidationResult = {
    ok: true;
    format: 'pem' | 'base64';
    normalizedKey: string;
} | {
    ok: false;
    reason: string;
};
export declare function validateAndNormalizePublicKey(input: string): PublicKeyValidationResult;
/**
 * Returns a random number. Don't use for cryptographic purposes.
 * @returns a random number
 */
export declare const randomId: () => string;
export declare const bigIntReplacer: (_key: string, value: unknown) => unknown;
/**
 * Creates a window features string for `window.open`, based on the current screen size.
 * It tries to center the window and limits the size to the given max width and height.
 * Slightly reduces the size to avoid browser auto-resizing.
 */
export declare const getWindowFeatures: (maxWidth: number, maxHeight: number) => string;
export declare const isPWA: () => boolean;
export declare const isIOS: () => boolean;
export declare const truncateAddress: (address: string, headLength?: number, tailLength?: number) => string;