Test TS types for addition of referrer and referrerPolicy

@types/index.d.ts

@@ -74,6 +74,14 @@ interface RequestInit {
 	 * An AbortSignal to set request's signal.
 	 */
 	signal?: AbortSignal | null;
+	/**
+	 * A string whose value is a same-origin URL, "about:client", or the empty string, to set request’s referrer.
+	 */
+	referrer?: string;
+	/**
+	 * A referrer policy to set request’s referrerPolicy.
+	 */
+	referrerPolicy?: ReferrerPolicy;
 
 	// Node-fetch extensions to the whatwg/fetch spec
 	agent?: Agent | ((parsedUrl: URL) => Agent);
@@ -115,6 +123,7 @@ declare class Body {
 }
 
 type RequestRedirect = 'error' | 'follow' | 'manual';
+type ReferrerPolicy =  '' | 'no-referrer' | 'no-referrer-when-downgrade' | 'same-origin' | 'origin' | 'strict-origin' | 'origin-when-cross-origin' | 'strict-origin-when-cross-origin' | 'unsafe-url';
 type RequestInfo = string | Body;
 declare class Request extends Body {
 	constructor(input: RequestInfo, init?: RequestInit);
@@ -139,6 +148,14 @@ declare class Request extends Body {
 	 * Returns the URL of request as a string.
 	 */
 	readonly url: string;
+	/**
+	 * A string whose value is a same-origin URL, "about:client", or the empty string, to set request’s referrer.
+	 */
+	readonly referrer: string;
+	/**
+	 * A referrer policy to set request’s referrerPolicy.
+	 */
+	readonly referrerPolicy: ReferrerPolicy;
 	clone(): Request;
 }