Add encode() and decode() types

libsquoosh/src/emscripten-utils.ts

@@ -11,7 +11,7 @@ export function instantiateEmscriptenWasm<T extends EmscriptenWasm.Module>(
   factory: EmscriptenWasm.ModuleFactory<T>,
   path: string,
   workerJS: string = '',
-): Promise<any> {
+): Promise<T> {
   return factory({
     locateFile(requestPath) {
       // The glue code generated by emscripten uses the original