CHANGE: Updated webpack config to work with emscripten

The default webpack options don't play with wasm32-emscripten.
Refer to the open issue in: webpack/webpack#7352

wasm/www/webpack.config.js

@@ -1,4 +1,5 @@
 const CopyWebpackPlugin = require("copy-webpack-plugin");
+const webpack = require("webpack");
 const path = require('path');
 
 module.exports = {
@@ -11,4 +12,22 @@ module.exports = {
   plugins: [
     new CopyWebpackPlugin(['index.html'])
   ],
+  // refer to https://github.com/webpack/webpack/issues/7352
+  // Hack to make it work with emscripten-wasm
+  node: { 
+    "fs": "empty" // ← !!
+  },
+  module: {
+    rules: [
+      /* ... */
+      {
+        test: /fibonacci\.wasm$/,
+        type: "javascript/auto", // ← !!
+        loader: "file-loader",
+        options: {
+          publicPath: "dist/"
+        }
+      }
+    ]
+  },
 };