export declare function generateLogReadableTimestamp(timestamp?: number): string;
export declare function generateLogReadableBlock(key: string, value: string | number | boolean | undefined | null, addSpacePrefix?: boolean): string;
export declare function capitalizeHeader(header: string): string;
export declare function parseXhrResponseHeaders(str: string | undefined): Record<string, string>;
export declare function parseFetchHeaders(headers: Headers, needsCapitalize: boolean): Record<string, string>;
export declare function parseFetchArrayHeaders(headers: [string, string][], needsCapitalize: boolean): Record<string, string>;
export declare function parseFetchRecordHeaders(headers: Record<string, string>, needsCapitalize: boolean): Record<string, string>;
export declare function serializeNonSerializable(nonSerializable: unknown): string;
export declare function serializeFormData(formData: FormData): string;
export declare function serializeXhrRequestBody(body: unknown): string;
export declare function serializeXhrResponseData(data: unknown, mimeType?: string): string;
export declare function serializeFetchRequestBody(request: unknown, mimeType?: string): Promise<string>;
export declare function serializeFetchResponseData(response: unknown, mimeType?: string): Promise<string>;
export declare function tryToSerializeFetchRequestBody(request: unknown, mimeType?: string): Promise<string>;
export declare function tryToSerializeFetchResponseData(response: unknown, mimeType?: string): Promise<string>;
export declare function parseHeadersInitIntoRecord(headers: HeadersInit | undefined | null, needsCapitalize: boolean): Record<string, string> | null | undefined;
export declare function serializeHeaders(headers: HeadersInit | undefined | null, needsCapitalize: boolean): string;
export declare function serializeMultipleHeaders(headersEntries: (HeadersInit | undefined | null)[], needsCapitalize: boolean): string;
export declare function getContentType(x: XMLHttpRequest | Request | Response | undefined): string;