diff --git a/types/k6/experimental/browser.d.ts b/types/k6/experimental/browser.d.ts
index d41ff24f1bd118..03b6574e2f5ec7 100644
--- a/types/k6/experimental/browser.d.ts
+++ b/types/k6/experimental/browser.d.ts
@@ -3683,7 +3683,7 @@ export interface Request {
      * lower-case.
      * @returns The headers object.
      */
-    allHeaders(): Record<string, string>;
+    allHeaders(): Promise<Record<string, string>>;
 
     /**
      * @returns the Frame that initiated this request
@@ -3703,14 +3703,14 @@ export interface Request {
      * `Set-Cookie`, appear in the array multiple times.
      * @returns An array of all the request HTTP headers.
      */
-    headersArray(): Array<{ name: string; value: string }>;
+    headersArray(): Promise<Array<{ name: string; value: string }>>;
 
     /**
      * Retuns the value of the header matching the name. The name is case insensitive.
      * @param name Header name to retrieve value for.
      * @returns The value of the header matching the name.
      */
-    headerValue(name: string): string | null;
+    headerValue(name: string): Promise<string | null>;
 
     /**
      * @returns a boolean stating whether the request is for a navigation
@@ -3727,7 +3727,7 @@ export interface Request {
      * Contains the request's post body, if any.
      * @returns request's post body
      */
-    postData(): string;
+    postData(): string | null;
 
     /**
      * Request's post body in a binary form, if any.
@@ -3749,13 +3749,13 @@ export interface Request {
      * due to error.
      * @returns The `Response` object, or `null` if the response was not received due to error.
      */
-    response(): Response | null;
+    response(): Promise<Response | null>;
 
     /**
      * Returns resource size information for given request.
      * @returns Resource size information for given request.
      */
-    size(): { body: number; headers: number };
+    size(): Promise<{ body: number; headers: number }>;
 
     /**
      * Returns resource timing information for given request. Most of the timing values
@@ -3781,13 +3781,13 @@ export interface Response {
      * lower-case.
      * @returns The headers object.
      */
-    allHeaders(): Record<string, string>;
+    allHeaders(): Promise<Record<string, string>>;
 
     /**
      * Returns the response body.
      * @returns A buffer with response body.
      */
-    body(): ArrayBuffer;
+    body(): Promise<ArrayBuffer>;
 
     /**
      * @returns the Frame that initiated this response
@@ -3807,7 +3807,7 @@ export interface Response {
      * appear in the array multiple times.
      * @returns An array of all the request HTTP headers.
      */
-    headersArray(): Array<{ name: string; value: string }>;
+    headersArray(): Promise<Array<{ name: string; value: string }>>;
 
     /**
      * Returns the value of the header matching the name. The name is case insensitive.
@@ -3817,7 +3817,7 @@ export interface Response {
      * @param name Header name to retrieve value for.
      * @returns The header value for the given name.
      */
-    headerValue(name: string): string | null;
+    headerValue(name: string): Promise<string | null>;
 
     /**
      * Returns all values of the headers matching the name, for example `set-cookie`.
@@ -3825,14 +3825,14 @@ export interface Response {
      * @param name Header name to retrieve values for.
      * @returns An array of header values for the given name.
      */
-    headerValues(name: string): string[];
+    headerValues(name: string): Promise<string[]>;
 
     /**
      * Returns the JSON representation of response body. Throws if response body is not
      * parsable via `JSON.parse`.
      * @returns JSON representation of response body.
      */
-    json(): any;
+    json(): Promise<any>;
 
     /**
      * Contains a boolean stating whether the response was successful (status in the
@@ -3851,13 +3851,13 @@ export interface Response {
      * Security details associated with this response.
      * @returns A matching `SecurityDetailsObject`
      */
-    securityDetails(): SecurityDetailsObject | null;
+    securityDetails(): Promise<SecurityDetailsObject | null>;
 
     /**
      * Returns the IP address and port of the server for this response.
      * @returns The IP address and port of the server
      */
-    serverAddr(): { ipAddress: string; port: number } | null;
+    serverAddr(): Promise<{ ipAddress: string; port: number } | null>;
 
     /**
      * Contains the status code of the response (e.g., 200 for a success).
@@ -3875,7 +3875,7 @@ export interface Response {
      * The size of the response body and the headers.
      * @returns The size of the response body and the headers.
      */
-    size(): { body: number; headers: number };
+    size(): Promise<{ body: number; headers: number }>;
 
     /**
      * Contains the URL of the response.
diff --git a/types/k6/test/browser.ts b/types/k6/test/browser.ts
index 6f28067b182276..daf9db38880ad2 100644
--- a/types/k6/test/browser.ts
+++ b/types/k6/test/browser.ts
@@ -1203,105 +1203,105 @@ async function test() {
     //
     // Request
     //
-    const request = page.goto(url).then(r => r?.request());
+    const request = await page.goto(url).then(r => r?.request()!);
 
-    // $ExpectType Promise<Record<string, string> | undefined>
-    request.then(r => r?.allHeaders());
+    // $ExpectType Promise<Record<string, string>>
+    request.allHeaders();
 
-    // $ExpectType Promise<Frame | undefined>
-    request.then(r => r?.frame());
+    // $ExpectType Frame
+    request.frame();
 
-    // $ExpectType Promise<Record<string, string> | undefined>
-    request.then(r => r?.headers());
+    // $ExpectType Record<string, string>
+    request.headers();
 
-    // $ExpectType Promise<{ name: string; value: string; }[] | undefined>
-    request.then(r => r?.headersArray());
+    // $ExpectType Promise<{ name: string; value: string; }[]>
+    request.headersArray();
 
     // @ts-expect-error
-    request.then(r => r?.headerValue());
-    // $ExpectType Promise<string | null | undefined>
-    request.then(r => r?.headerValue("content-type"));
+    request.headerValue();
+    // $ExpectType Promise<string | null>
+    request.headerValue("content-type");
 
-    // $ExpectType Promise<boolean | undefined>
-    request.then(r => r?.isNavigationRequest());
+    // $ExpectType boolean
+    request.isNavigationRequest();
 
-    // $ExpectType Promise<string | undefined>
-    request.then(r => r?.method());
+    // $ExpectType string
+    request.method();
 
-    // $ExpectType Promise<string | undefined>
-    request.then(r => r?.postData());
+    // $ExpectType string | null
+    request.postData();
 
-    // $ExpectType Promise<ArrayBuffer | null | undefined>
-    request.then(r => r?.postDataBuffer());
+    // $ExpectType ArrayBuffer | null
+    request.postDataBuffer();
 
-    // $ExpectType Promise<"document" | "stylesheet" | "image" | "media" | "font" | "script" | "texttrack" | "xhr" | "fetch" | "eventsource" | "websocket" | "manifest" | "other" | undefined>
-    request.then(r => r?.resourceType());
+    // $ExpectType ResourceType
+    request.resourceType();
 
-    // $ExpectType Promise<Response | null | undefined>
-    request.then(r => r?.response());
+    // $ExpectType Promise<Response | null>
+    request.response();
 
-    // $ExpectType Promise<{ body: number; headers: number; } | undefined>
-    request.then(r => r?.size());
+    // $ExpectType Promise<{ body: number; headers: number; }>
+    request.size();
 
-    // $ExpectType Promise<ResourceTiming | undefined>
-    request.then(r => r?.timing());
+    // $ExpectType ResourceTiming
+    request.timing();
 
     //
     // Response
     //
-    const response = page.goto(url);
+    const response = await page.goto(url).then(r => r!);
 
-    // $ExpectType Promise<Record<string, string> | undefined>
-    response.then(r => r?.allHeaders());
+    // $ExpectType Promise<Record<string, string>>
+    response.allHeaders();
 
-    // $ExpectType Promise<ArrayBuffer | undefined>
-    response.then(r => r?.body());
+    // $ExpectType Promise<ArrayBuffer>
+    response.body();
 
-    // $ExpectType Promise<Frame | undefined>
-    response.then(r => r?.frame());
+    // $ExpectType Frame
+    response.frame();
 
-    // $ExpectType Promise<Record<string, string> | undefined>
-    response.then(r => r?.headers());
+    // $ExpectType Record<string, string>
+    response.headers();
 
-    // $ExpectType Promise<{ name: string; value: string; }[] | undefined>
-    response.then(r => r?.headersArray());
+    // $ExpectType Promise<{ name: string; value: string; }[]>
+    response.headersArray();
 
     // @ts-expect-error
-    response.then(r => r?.headerValue());
-    // $ExpectType Promise<string | null | undefined>
-    response.then(r => r?.headerValue("content-type"));
+    response.headerValue();
+    // $ExpectType Promise<string | null>
+    response.headerValue("content-type");
 
     // @ts-expect-error
-    response.then(r => r?.headerValues());
-    // $ExpectType Promise<string[] | undefined>
-    response.then(r => r?.headerValues("content-type"));
+    response.headerValues();
+    // $ExpectType Promise<string[]>
+    response.headerValues("content-type");
 
     // $ExpectType Promise<any>
-    response.then(r => r?.json());
+    response.json();
 
-    // $ExpectType Promise<boolean | undefined>
-    response.then(r => r?.ok());
+    // $ExpectType boolean
+    response.ok();
 
-    // $ExpectType Promise<Request | undefined>
-    response.then(r => r?.request());
+    // $ExpectType Request
+    response.request();
 
-    // $ExpectType Promise<SecurityDetailsObject | null | undefined>
-    response.then(r => r?.securityDetails());
+    // $ExpectType Promise<SecurityDetailsObject | null>
+    response.securityDetails();
 
-    // $ExpectType Promise<{ ipAddress: string; port: number; } | null | undefined>
-    response.then(r => r?.serverAddr());
+    // $ExpectType Promise<{ ipAddress: string; port: number; } | null>
+    response.serverAddr();
 
-    // $ExpectType Promise<number | undefined>
-    response.then(r => r?.status());
+    // $ExpectType number
+    response.status();
 
-    // $ExpectType Promise<string | undefined>
-    response.then(r => r?.statusText());
+    // $ExpectType string
+    response.statusText();
 
-    // $ExpectType Promise<{ body: number; headers: number; } | undefined>
-    response.then(r => r?.size());
+    // $ExpectType Promise<{ body: number; headers: number; }>
+    response.size();
 
-    // $ExpectType Promise<string | undefined>
-    response.then(r => r?.url());
+    // $ExpectType string
+    response.url();
 
     //
     // ElementHandle