Extend global namespace with jest matcher (#308)

Author: Tobias Lengsholz

typings/index.d.ts

@@ -1,21 +1,23 @@
 import { Plugin, NewPlugin } from 'pretty-format'
 
-declare namespace jest {
-  interface AsymmetricMatcher {
-    $$typeof: Symbol;
-    sample?: string | RegExp | object | Array<any> | Function;
-  }
+declare global {
+  namespace jest {
+    interface AsymmetricMatcher {
+      $$typeof: Symbol;
+      sample?: string | RegExp | object | Array<any> | Function;
+    }
 
-  type Value = string | number | RegExp | AsymmetricMatcher | undefined;
+    type Value = string | number | RegExp | AsymmetricMatcher | undefined;
 
-  interface Options {
-    media?: string;
-    modifier?: string;
-    supports?: string;
-  }
+    interface Options {
+      media?: string;
+      modifier?: string;
+      supports?: string;
+    }
 
-  interface Matchers<R, T> {
-    toHaveStyleRule(property: string, value?: Value, options?: Options): R;
+    interface Matchers<R, T> {
+      toHaveStyleRule(property: string, value?: Value, options?: Options): R;
+    }
   }
 }