Fix/meshopt wechat (#406)

* fix wechat wasm.validation problem

* fix wechat problems

emscripten/meshopt/meshopt_decoder.d.ts

@@ -1,12 +1,5 @@
 declare module 'external:emscripten/meshopt/meshopt_decoder.asm.js' {
-    export default MeshoptDecoder;
+    namespace MeshoptDecoder {
-}
-
-declare module 'external:emscripten/meshopt/meshopt_decoder.wasm.js' {
-    export default MeshoptDecoder;
-}
-
-declare namespace MeshoptDecoder {
         const supported: boolean;
         const ready: Promise<void>;
 
@@ -18,4 +11,25 @@ declare namespace MeshoptDecoder {
 
         function useWorkers (count: number): void;
         function decodeGltfBufferAsync (count: number, size: number, source: Uint8Array, mode: string, filter?: string): Promise<Uint8Array>;
+    }
+
+    export default MeshoptDecoder;
+}
+
+declare module 'external:emscripten/meshopt/meshopt_decoder.wasm.js' {
+    namespace MeshoptDecoder {
+        const supported: boolean;
+        const ready: (instantiateWasm: any) => Promise<void>;
+
+        function decodeVertexBuffer (target: Uint8Array, count: number, size: number, source: Uint8Array, filter?: string): void;
+        function decodeIndexBuffer (target: Uint8Array, count: number, size: number, source: Uint8Array): void;
+        function decodeIndexSequence (target: Uint8Array, count: number, size: number, source: Uint8Array): void;
+
+        function decodeGltfBuffer (target: Uint8Array, count: number, size: number, source: Uint8Array, mode: string, filter?: string): void;
+
+        function useWorkers (count: number): void;
+        function decodeGltfBufferAsync (count: number, size: number, source: Uint8Array, mode: string, filter?: string): Promise<Uint8Array>;
+    }
+
+    export default MeshoptDecoder;
 }