export interface FetchResponseObject {
    ok: boolean;
    status?: unknown;
    statusText?: unknown;
    headers?: unknown;
    text?: unknown;
    json?: unknown;
}
export declare function assertFetchResponseObject(response: unknown, prefix: string): asserts response is FetchResponseObject;
export declare function assertFetchErrorResponseStatus(response: FetchResponseObject, prefix: string): asserts response is FetchResponseObject & {
    status: number;
    statusText: string;
};
export declare function assertFetchResponseJson(response: FetchResponseObject, prefix: string): asserts response is FetchResponseObject & {
    json: () => Promise<unknown>;
};
export declare function assertFetchResponseJsonContentType(response: FetchResponseObject, prefix: string): void;
export declare function readFetchErrorResponseBody(response: FetchResponseObject): Promise<string>;
export declare function formatFetchErrorResponseDetail(response: FetchResponseObject & {
    status: number;
    statusText: string;
}, responseBody: string): string;
export declare function getFetchResponseContentType(response: FetchResponseObject): string | null;
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