import loglevel from "loglevel";
/**
 * returns true if the given object is a promise
 */
export declare function isPromise(obj: unknown): boolean;
export declare const PROMISE_RESOLVED_FALSE: Promise<boolean>;
export declare const PROMISE_RESOLVED_TRUE: Promise<boolean>;
export declare const PROMISE_RESOLVED_VOID: Promise<void>;
export declare function sleep<T>(time?: number, resolveWith?: T): Promise<T>;
export declare function randomInt(min: number, max: number): number;
/**
 * https://stackoverflow.com/a/8084248
 */
export declare function generateRandomId(): string;
/**
 * returns the current time in micro-seconds,
 * WARNING: This is a pseudo-function
 * Performance.now is not reliable in webworkers, so we just make sure to never return the same time.
 * This is enough in browsers, and this function will not be used in nodejs.
 * The main reason for this hack is to ensure that BroadcastChannel behaves equal to production when it is used in fast-running unit tests.
 */
export declare function microSeconds(): number;
export declare const log: loglevel.Logger;
export declare const setLogLevel: (level: loglevel.LogLevelDesc) => void;