diff --git a/src/index.d.ts b/src/index.d.ts
index 0c53ad9..7f2c7a6 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -12,6 +12,33 @@ declare namespace unfetch {
   export type IsomorphicRequest = Request | NodeRequest
 }
 
-declare const unfetch: typeof fetch;
+type UnfetchResponse = {
+	ok: boolean,
+	statusText: string,
+	status: number,
+	url: string,
+	text: () => Promise<string>,
+	json: () => Promise<any>,
+	blob: () => Promise<Blob>,
+	clone: () => UnfetchResponse,
+	headers: {
+		keys: () => string[],
+		entries: () => Array<[string, string]>,
+		get: (key: string) => string | undefined,
+		has: (key: string) => boolean,
+	}
+}
+
+type Unfetch = (
+	url: string,
+	options?: {
+		method?: string,
+		headers?: Record<string, string>,
+		credentials?: 'include' | 'omit',
+		body?: Parameters<XMLHttpRequest["send"]>[0]
+	}
+) => Promise<UnfetchResponse>
+
+declare const unfetch: Unfetch;
 
 export default unfetch;