From 5a14aad368a03f7d7992b18a09dc01746c0fe0f3 Mon Sep 17 00:00:00 2001
From: William Bergeron-Drouin <william@inter-net.ca>
Date: Mon, 31 Jan 2022 12:58:45 -0500
Subject: [PATCH] docs: fix instructions for custom matchers type declarations
 (#11483)

Co-authored-by: Max Schmitt <max@schmitt.mx>
---
 docs/src/test-advanced-js.md | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/docs/src/test-advanced-js.md b/docs/src/test-advanced-js.md
index 51ed0649d0..13244146a4 100644
--- a/docs/src/test-advanced-js.md
+++ b/docs/src/test-advanced-js.md
@@ -554,11 +554,13 @@ test('numeric ranges', () => {
 
 For TypeScript, also add the following to `global.d.ts`. You don't need it for JavaScript.
 
-```js
+```ts
 // global.d.ts
-declare namespace PlaywrightTest {
-  interface Matchers<R> {
-    toBeWithinRange(a: number, b: number): R;
+declare global {
+ namespace PlaywrightTest {
+    interface Matchers<R> {
+      toBeWithinRange(a: number, b: number): R;
+    }
   }
 }
 ```