diff --git a/packages/playwright/types/test.d.ts b/packages/playwright/types/test.d.ts
index fe74d00184..42d85d45fc 100644
--- a/packages/playwright/types/test.d.ts
+++ b/packages/playwright/types/test.d.ts
@@ -18,7 +18,7 @@
 import type { APIRequestContext, Browser, BrowserContext, BrowserContextOptions, Page, LaunchOptions, ViewportSize, Geolocation, HTTPCredentials, Locator, APIResponse, PageScreenshotOptions } from 'playwright-core';
 export * from 'playwright-core';
 
-export type ReporterDescription =
+export type ReporterDescription = Readonly<
   ['blob'] | ['blob', { outputDir?: string, fileName?: string }] |
   ['dot'] |
   ['line'] |
@@ -28,7 +28,8 @@ export type ReporterDescription =
   ['json'] | ['json', { outputFile?: string }] |
   ['html'] | ['html', { outputFolder?: string, open?: 'always' | 'never' | 'on-failure', host?: string, port?: number, attachmentsBaseURL?: string }] |
   ['null'] |
-  [string] | [string, any];
+  [string] | [string, any]
+>;
 
 type UseOptions<TestArgs, WorkerArgs> = Partial<WorkerArgs> & Partial<TestArgs>;
 
diff --git a/utils/generate_types/overrides-test.d.ts b/utils/generate_types/overrides-test.d.ts
index 72cdf3a7b3..9d58db13fe 100644
--- a/utils/generate_types/overrides-test.d.ts
+++ b/utils/generate_types/overrides-test.d.ts
@@ -17,7 +17,7 @@
 import type { APIRequestContext, Browser, BrowserContext, BrowserContextOptions, Page, LaunchOptions, ViewportSize, Geolocation, HTTPCredentials, Locator, APIResponse, PageScreenshotOptions } from 'playwright-core';
 export * from 'playwright-core';
 
-export type ReporterDescription =
+export type ReporterDescription = Readonly<
   ['blob'] | ['blob', { outputDir?: string, fileName?: string }] |
   ['dot'] |
   ['line'] |
@@ -27,7 +27,8 @@ export type ReporterDescription =
   ['json'] | ['json', { outputFile?: string }] |
   ['html'] | ['html', { outputFolder?: string, open?: 'always' | 'never' | 'on-failure', host?: string, port?: number, attachmentsBaseURL?: string }] |
   ['null'] |
-  [string] | [string, any];
+  [string] | [string, any]
+>;
 
 type UseOptions<TestArgs, WorkerArgs> = Partial<WorkerArgs> & Partial<TestArgs>;