stricter types for bodymixin.json

test/types/dispatcher.test-d.ts

@@ -119,5 +119,5 @@ declare const { body }: Dispatcher.ResponseData;
   expectType<Promise<Blob>>(body.blob())
   expectType<Promise<never>>(body.formData())
   expectType<Promise<string>>(body.text())
-  expectType<Promise<any>>(body.json())
+  expectType<Promise<unknown>>(body.json())
 }

test/types/readable.test-d.ts

@@ -15,7 +15,7 @@ expectAssignable<BodyReadable>(new BodyReadable())
   expectAssignable<Promise<string>>(readable.text())
 
   // json
-  expectAssignable<Promise<any>>(readable.json())
+  expectAssignable<Promise<unknown>>(readable.json())
 
   // blob
   expectAssignable<Promise<Blob>>(readable.blob())

types/dispatcher.d.ts

@@ -229,7 +229,7 @@ declare namespace Dispatcher {
     arrayBuffer(): Promise<ArrayBuffer>;
     blob(): Promise<Blob>;
     formData(): Promise<never>;
-    json(): Promise<any>;
+    json(): Promise<unknown>;
     text(): Promise<string>;
   }
 

types/readable.d.ts

@@ -18,7 +18,7 @@ declare class BodyReadable extends Readable {
   /** Consumes and returns the body as a JavaScript Object
    *  https://fetch.spec.whatwg.org/#dom-body-json
    */
-  json(): Promise<any>
+  json(): Promise<unknown>
 
   /** Consumes and returns the body as a Blob
    *  https://fetch.spec.whatwg.org/#dom-body-blob