tor-browser

commit 67234fcc689f987e58c2e60e6d6fd51f8244f633
parent 092a9faecc5b939516e7fddaef4d5a37c7d90509
Author: Daniel Minor <dminor@mozilla.com>
Date:   Fri, 12 Dec 2025 14:12:36 +0000

Bug 1994828 - Set wasm mime type on module request; r=dom-core,smaug

Differential Revision: https://phabricator.services.mozilla.com/D270151

Diffstat:
M
dom/script/ScriptLoader.cpp
 | 
15
+++++++++++++++

1 file changed, 15 insertions(+), 0 deletions(-)
diff --git a/dom/script/ScriptLoader.cpp b/dom/script/ScriptLoader.cpp
@@ -4619,6 +4619,21 @@ nsresult ScriptLoader::PrepareLoadedRequest(ScriptLoadRequest* aRequest,
       if (policy != ReferrerPolicy::_empty) {
         aRequest->AsModuleRequest()->UpdateReferrerPolicy(policy);
       }
+
+#ifdef NIGHTLY_BUILD
+      if (StaticPrefs::javascript_options_experimental_wasm_esm_integration()) {
+        // https://html.spec.whatwg.org/multipage/webappapis.html#fetch-a-single-module-script
+        // Extract the content-type. If its essence is wasm, we'll attempt to
+        // compile this module as a wasm module. (Steps 13.2, 13.6)
+        nsAutoCString mimeType;
+        if (NS_SUCCEEDED(httpChannel->GetContentType(mimeType))) {
+          if (nsContentUtils::HasWasmMimeTypeEssence(
+                  NS_ConvertUTF8toUTF16(mimeType))) {
+            aRequest->AsModuleRequest()->SetHasWasmMimeTypeEssence();
+          }
+        }
+      }
+#endif
     }
 
     nsAutoCString sourceMapURL;