Bug 1720570 - Handle css module in GetModuleType; r=allstarschh

Differential Revision: https://phabricator.services.mozilla.com/D263411

Author: dminor

js/src/builtin/ModuleObject.cpp

@@ -218,17 +218,25 @@ static bool GetModuleType(JSContext* cx,
                           JS::ModuleType& moduleType) {
   for (const ImportAttribute& importAttribute : maybeAttributes) {
     if (importAttribute.key() == cx->names().type) {
-      int32_t isJsonString;
+      int32_t result;
       if (!js::CompareStrings(cx, cx->names().json, importAttribute.value(),
-                              &isJsonString)) {
+                              &result)) {
         return false;
       }
-
-      if (isJsonString == 0) {
+      if (result == 0) {
         moduleType = JS::ModuleType::JSON;
         return true;
       }
 
+      if (!js::CompareStrings(cx, cx->names().css, importAttribute.value(),
+                              &result)) {
+        return false;
+      }
+      if (result == 0) {
+        moduleType = JS::ModuleType::CSS;
+        return true;
+      }
+
       moduleType = JS::ModuleType::Unknown;
       return true;
     }

js/src/vm/CommonPropertyNames.h

@@ -98,6 +98,7 @@
   MACRO_(currency, "currency")                                                 \
   MACRO_(currencyDisplay, "currencyDisplay")                                   \
   MACRO_(currencySign, "currencySign")                                         \
+  MACRO_(css, "css")                                                           \
   MACRO_(date, "date")                                                         \
   MACRO_(dateStyle, "dateStyle")                                               \
   MACRO_(day, "day")                                                           \