simple fix on SharedArrayBuffer is not defined (#7)

src/lib/engine/shared.ts

@@ -10,7 +10,13 @@ export const isWasmSupported = () =>
     Uint8Array.of(0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00)
   );
 
-export const isMultiThreadSupported = () => SharedArrayBuffer !== undefined;
+export const isMultiThreadSupported = () => {
+  try {
+    return SharedArrayBuffer !== undefined;
+  } catch(e) {
+    return false;
+  }
+};
 
 export const isEngineSupported = (name: EngineName): boolean => {
   switch (name) {