import { Readable, Subscriber, Unsubscriber } from "svelte/store";
export type AsyncStatus<T> = {
    status: "pending";
} | {
    status: "complete";
    value: T;
} | {
    status: "error";
    error: any;
};
export type AsyncReadable<T> = Readable<AsyncStatus<T>>;
export declare function asyncReadable<T>(load: (set: Subscriber<T>) => Promise<Unsubscriber | void>): AsyncReadable<T>;
export declare function lazyLoad<T>(load: () => Promise<T>): AsyncReadable<T>;
export declare function lazyLoadAndPoll<T>(load: () => Promise<T>, pollIntervalMs: number, firstLoad?: () => Promise<T>): AsyncReadable<T>;
export declare function completed<T>(v: T): AsyncReadable<T>;
export declare function alwaysSubscribed<T>(readable: Readable<T>): Readable<T>;
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