import { AssetType } from '@pickerjs/common/lib/generated-types';
import { ID } from '@pickerjs/common/lib/shared-types';
import { Observable, Observer } from 'rxjs';
export declare function not(predicate: (...args: any[]) => boolean): (...args: any[]) => boolean;
export declare function foundIn<T>(set: T[], compareBy: keyof T): (item: T) => boolean;
export declare function assertFound<T>(promise: Promise<T | undefined>): Promise<T>;
export declare function idsAreEqual(id1?: ID, id2?: ID): boolean;
export declare function getAssetType(mimeType: string): AssetType;
export declare function normalizeEmailAddress(input: string): string;
export declare function awaitPromiseOrObservable<T>(value: T | Promise<T> | Observable<T>): Promise<T>;
export declare function asyncObservable<T>(work: (observer: Observer<T>) => Promise<T | void>): Observable<T>;