import { Source } from './state/app-state.ts';
export declare function mapObject(o: any, f: (key: string, value: any) => any, ifPred: (key: string) => boolean): any[];
type Killer = () => void;
export type AbortablePromise<T> = Promise<T> & {
    kill: Killer;
};
export declare function AbortablePromise<T>(f: (resolve: (result: T) => void, reject: (error: any) => void) => Killer): AbortablePromise<T>;
export declare function turnIntoDelayableExecution<T extends any[], R>(delay: number, job: (...args: T) => AbortablePromise<R>): (...args: T) => ({ now }: {
    now: boolean;
}) => AbortablePromise<R>;
export declare function validateStringEnum<T extends string>(s: T, values: T[], orElse?: (s: string) => T): T;
export declare const validateBoolean: (s: boolean, orElse?: () => boolean) => boolean;
export declare const validateString: (s: string, orElse?: () => string) => string;
export declare const validateArray: <T>(a: Array<T>, validateElement: (e: T) => T, orElse?: () => T[]) => T[];
export declare function formatBytes(n: number): string;
export declare function formatMillis(n: number): string;
export declare function registerCustomAppHeightCSSProperty(): void;
export declare function isInStandaloneMode(): boolean;
export declare function downloadUrl(url: string, filename: string): void;
export declare function fetchSource(fs: FS, { content, path, url }: Source): Promise<Uint8Array>;
export declare function readFileAsDataURL(file: File): Promise<string>;
export {};
//# sourceMappingURL=utils.d.ts.map