export declare const MAX_FETCH_BYTES = 52428800;
export declare const MAX_TEXT_BYTES = 10485760;
export declare function findNearestExistingAncestor(targetPath: string): string | null;
export declare function validateGraphPath(graphPath: string, base?: string): string;
export declare function validateGraphOutputPath(targetPath: string, base?: string, workspaceRoot?: string): string;
export declare function validateUrl(url: string): string;
export declare function safeFetchResponseWithMetadata(url: string, timeout?: number): Promise<{
    response: Response;
    finalUrl: string;
    contentType: string;
}>;
export declare function readResponseBytes(response: Response, url: string, maxBytes: number): Promise<Uint8Array>;
export declare function safeFetchWithMetadata(url: string, maxBytes?: number, timeout?: number): Promise<{
    bytes: Uint8Array;
    finalUrl: string;
    contentType: string;
}>;
export declare function safeFetch(url: string, maxBytes?: number, timeout?: number): Promise<Uint8Array>;
export declare function safeFetchText(url: string, maxBytes?: number, timeout?: number): Promise<string>;
export declare function safeFetchTextWithMetadata(url: string, maxBytes?: number, timeout?: number): Promise<{
    text: string;
    finalUrl: string;
    contentType: string;
}>;
export declare function sanitizeLabel(text: string): string;