import type { SourceErrorReason, SourceResult } from '../types/index.js';
export declare function fetchWithTimeout(url: string, init?: RequestInit & {
    timeoutMs?: number;
}): Promise<Response>;
export declare function sourceError<T>(sourceId: string, startedAt: number, err: unknown, opts?: {
    reason?: SourceErrorReason;
    envVar?: string;
}): SourceResult<T>;