type FetchImpl = typeof fetch;
type LookupAddresses = (hostname: string) => Promise<string[]>;
type PinnedFetchImpl = (url: URL, address: string, signal: AbortSignal) => Promise<Response>;
export interface FetchUploadSourceOptions {
    label: string;
    fallbackContentType: string;
    fallbackFilename: string;
    timeoutMs: number;
    maxBytes?: number;
    allowedContentTypes?: string[];
    fetchImpl?: FetchImpl;
    pinnedFetchImpl?: PinnedFetchImpl;
    lookupAddresses?: LookupAddresses;
}
export interface UploadSource {
    buffer: Buffer;
    contentType: string;
    filename: string;
}
export declare function fetchUploadSource(url: string, opts: FetchUploadSourceOptions): Promise<UploadSource>;
export declare function validateRemoteUrl(url: URL, lookupAddresses?: LookupAddresses): Promise<void>;
export {};
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