perf(webidl): optimize createDictionaryConverter() (#12279)

On a benchmark constructing Responses with headers this shaves off 25%
denoland · Sep 30, 2021 · 7283647 · 7283647
1 parent a2632c8
commit 7283647
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/ext/webidl/00_webidl.js b/ext/webidl/00_webidl.js
@@ -41,6 +41,7 @@
     NumberMAX_SAFE_INTEGER,
     // deno-lint-ignore camelcase
     NumberMIN_SAFE_INTEGER,
+    ObjectAssign,
     ObjectCreate,
     ObjectDefineProperties,
     ObjectDefineProperty,
@@ -726,7 +727,7 @@
       }
       const esDict = V;
 
-      const idlDict = { ...defaultValues };
+      const idlDict = ObjectAssign({}, defaultValues);
 
       // NOTE: fast path Null and Undefined.
       if ((V === undefined || V === null) && !hasRequiredKey) {