From 1666b7a611ad1149ff4143b0d4a308eb55b5c549 Mon Sep 17 00:00:00 2001
From: Luciano Martorella <luciano.martorella@iongroup.com>
Date: Wed, 13 Aug 2025 16:46:43 +0200
Subject: [PATCH] - Using instantiateStreaming when using URL in browser

---
 lib/read-wasm-browser.js |  2 +-
 lib/wasm.js              | 17 ++++++++++++++---
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/lib/read-wasm-browser.js b/lib/read-wasm-browser.js
index a4fb29c2..26e6c78e 100644
--- a/lib/read-wasm-browser.js
+++ b/lib/read-wasm-browser.js
@@ -4,7 +4,7 @@ let mappingsWasm = null;
 
 module.exports = function readWasm() {
   if (typeof mappingsWasm === "string") {
-    return fetch(mappingsWasm).then(response => response.arrayBuffer());
+    return fetch(mappingsWasm);
   }
   if (mappingsWasm instanceof ArrayBuffer) {
     return Promise.resolve(mappingsWasm);
diff --git a/lib/wasm.js b/lib/wasm.js
index 3091d9ee..c29122f4 100644
--- a/lib/wasm.js
+++ b/lib/wasm.js
@@ -23,8 +23,8 @@ module.exports = function wasm() {
   const callbackStack = [];
 
   cachedWasm = readWasm()
-    .then(buffer => {
-      return WebAssembly.instantiate(buffer, {
+    .then(bufferOrResponse => {
+      const opts = {
         env: {
           mapping_callback(
             generatedLine,
@@ -114,7 +114,18 @@ module.exports = function wasm() {
             console.timeEnd("sort_by_original_location");
           },
         },
-      });
+      };
+      let source;
+      if (bufferOrResponse instanceof Response) {
+        if (WebAssembly.instantiateStreaming) {
+          source = WebAssembly.instantiateStreaming(bufferOrResponse, opts);
+        } else {
+          source = WebAssembly.instantiate(bufferOrResponse.arrayBuffer(), opts);
+        }
+      } else {
+        source = WebAssembly.instantiate(bufferOrResponse, opts);
+      }
+      return source;
     })
     .then(Wasm => {
       return {