Merge pull request #9022 from sandersn/fix-webassembly-declaration

Update WebAssembly declaration

Author: sokra

declarations.d.ts

@@ -255,7 +255,7 @@ declare const hotAddUpdateChunk;
 declare const parentHotUpdateCallback;
 declare const $hotChunkFilename$;
 declare const $hotMainFilename$;
-declare const WebAssembly;
+declare namespace WebAssembly {}
 declare const importScripts;
 declare const $crossOriginLoading$;
 declare const chunkId;