feat(core): add useBrowserOnly

Author: Char2sGu

packages/core/src/platform.ts

@@ -0,0 +1,8 @@
+import { inject, PLATFORM_ID } from '@angular/core';
+
+export const useBrowserOnly =
+  (platform = inject(PLATFORM_ID)) =>
+  <T>(fn: () => T): T | null => {
+    if (platform !== 'browser') return null;
+    return fn();
+  };

packages/core/src/public-api.ts

@@ -1,4 +1,5 @@
 export * from './exception';
 export * from './injection';
+export * from './platform';
 export * from './provide';
 export { $type, ContainedTypeOf, TypeContainer } from 'type-container';