payload-is/lib/types/dom.d.ts

A comprehensive TypeScript/JavaScript type checking library providing functions to check data types, collections, primitives, and built-in objects

export declare function isBlob(payload: unknown): payload is Blob;
export declare function isFile(payload: unknown): payload is File;
export declare function isFormData(payload: unknown): payload is FormData;
export declare function isHeaders(payload: unknown): payload is Headers;
export declare function isRequest(payload: unknown): payload is Request;
export declare function isResponse(payload: unknown): payload is Response;