Erase specific implementation type at the return type of DefaultRubyVM

Author: kateinoigakukun

packages/npm-packages/ruby-wasm-wasi/src/browser.ts

@@ -5,7 +5,7 @@ import { RubyVM } from "./index";
 export const DefaultRubyVM = async (
   rubyModule: WebAssembly.Module,
   options: { consolePrint: boolean } = { consolePrint: true }
-) => {
+): Promise<{ vm: RubyVM, wasi: any, fs: any, instance: WebAssembly.Instance }> => {
   const wasmFs = new WasmFs();
   const wasi = new WASI({
     bindings: {