export type DataSourceStatus = "idle" | "loading" | "ready" | "error";
export interface DataSourceState<T> {
    readonly status: DataSourceStatus;
    readonly data: T | undefined;
    readonly error: Error | undefined;
}
export interface DataSourceClock {
    setInterval(handler: () => void, intervalMs: number): unknown;
    clearInterval(handle: unknown): void;
}
export interface DataSourceOptions {
    intervalMs?: number;
    clock?: DataSourceClock;
}
export interface RefreshOptions {
    force?: boolean;
}
export interface DataSource<T> {
    getState(): DataSourceState<T>;
    subscribe(listener: (state: DataSourceState<T>) => void): () => void;
    refresh(options?: RefreshOptions): Promise<void>;
    startPolling(intervalMs?: number): void;
    stopPolling(): void;
    dispose(): void;
}
export declare function createDataSource<T>(load: (signal: AbortSignal) => Promise<T>, options?: DataSourceOptions): DataSource<T>;