Fix: fallback to typeof when toString is applied to incompatible obje…

…ct (#16017)
babel · Oct 10, 2023 · d25f265 · d25f265
1 parent 0c9032d
commit d25f265
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/packages/babel-helpers/src/helpers.ts b/packages/babel-helpers/src/helpers.ts
@@ -314,7 +314,12 @@ helpers.construct = helper("7.0.0-beta.0")`
 helpers.isNativeFunction = helper("7.0.0-beta.0")`
   export default function _isNativeFunction(fn) {
     // Note: This function returns "true" for core-js functions.
-    return Function.toString.call(fn).indexOf("[native code]") !== -1;
+    try {
+      return Function.toString.call(fn).indexOf("[native code]") !== -1;
+    } catch (e) {
+      // Firefox 31 throws when "toString" is applied to an HTMLElement
+      return typeof fn === "function";
+    }
   }
 `;