refactor: update runtime code for primordial check for iterators (#13510)

1 files changed, 15 insertions, 11 deletions

diff --git a/ext/web/05_base64.js b/ext/web/05_base64.js
index 7f4b607c9..1244ecfd5 100644
--- a/ext/web/05_base64.js
+++ b/ext/web/05_base64.js
@@ -19,6 +19,7 @@
     ArrayPrototypeMap,
     StringPrototypeCharCodeAt,
     ArrayPrototypeJoin,
+    SafeArrayIterator,
     StringFromCharCode,
     TypedArrayFrom,
     Uint8Array,
@@ -38,7 +39,7 @@
 
     const uint8Array = forgivingBase64Decode(data);
     const result = ArrayPrototypeMap(
-      [...uint8Array],
+      [...new SafeArrayIterator(uint8Array)],
       (byte) => StringFromCharCode(byte),
     );
     return ArrayPrototypeJoin(result, "");
@@ -55,16 +56,19 @@
       prefix,
       context: "Argument 1",
     });
-    const byteArray = ArrayPrototypeMap([...data], (char) => {
-      const charCode = StringPrototypeCharCodeAt(char, 0);
-      if (charCode > 0xff) {
-        throw new DOMException(
-          "The string to be encoded contains characters outside of the Latin1 range.",
-          "InvalidCharacterError",
-        );
-      }
-      return charCode;
-    });
+    const byteArray = ArrayPrototypeMap(
+      [...new SafeArrayIterator(data)],
+      (char) => {
+        const charCode = StringPrototypeCharCodeAt(char, 0);
+        if (charCode > 0xff) {
+          throw new DOMException(
+            "The string to be encoded contains characters outside of the Latin1 range.",
+            "InvalidCharacterError",
+          );
+        }
+        return charCode;
+      },
+    );
     return forgivingBase64Encode(TypedArrayFrom(Uint8Array, byteArray));
   }