fix(ext,runtime): add missing custom inspections (#21219)

1 files changed, 12 insertions, 0 deletions

diff --git a/ext/fetch/21_formdata.js b/ext/fetch/21_formdata.js
index 84d31898e..12ce2bb58 100644
--- a/ext/fetch/21_formdata.js
+++ b/ext/fetch/21_formdata.js
@@ -26,10 +26,12 @@ const {
   MapPrototypeSet,
   MathRandom,
   ObjectFreeze,
+  ObjectFromEntries,
   ObjectPrototypeIsPrototypeOf,
   SafeMap,
   SafeRegExp,
   Symbol,
+  SymbolFor,
   StringFromCharCode,
   StringPrototypeCharCodeAt,
   StringPrototypeTrim,
@@ -262,6 +264,16 @@ class FormData {
       ArrayPrototypePush(list, entry);
     }
   }
+
+  [SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
+    if (ObjectPrototypeIsPrototypeOf(FormDataPrototype, this)) {
+      return `${this.constructor.name} ${
+        inspect(ObjectFromEntries(this), inspectOptions)
+      }`;
+    } else {
+      return `${this.constructor.name} ${inspect({}, inspectOptions)}`;
+    }
+  }
 }
 
 webidl.mixinPairIterable("FormData", FormData, entryList, "name", "value");