From 28e184e5ccf0dc322d329b82cc002b7e5f1e9a6b Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Thu, 30 Jun 2022 19:59:24 +0100
Subject: js: Implement pretty-printing of WeakMap objects

---
 Userland/Utilities/js.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'Userland/Utilities')

diff --git a/Userland/Utilities/js.cpp b/Userland/Utilities/js.cpp
index 1ceda2b5ef..ff6525b7d0 100644
--- a/Userland/Utilities/js.cpp
+++ b/Userland/Utilities/js.cpp
@@ -72,6 +72,7 @@
 #include <LibJS/Runtime/Temporal/ZonedDateTime.h>
 #include <LibJS/Runtime/TypedArray.h>
 #include <LibJS/Runtime/Value.h>
+#include <LibJS/Runtime/WeakMap.h>
 #include <LibJS/SourceTextModule.h>
 #include <LibLine/Editor.h>
 #include <LibMain/Main.h>
@@ -413,6 +414,13 @@ static void print_set(JS::Set const& set, HashTable<JS::Object*>& seen_objects)
     js_out("}}");
 }
 
+static void print_weak_map(JS::WeakMap const& weak_map, HashTable<JS::Object*>&)
+{
+    print_type("WeakMap");
+    js_out(" ({})", weak_map.values().size());
+    // Note: We could tell you what's actually inside, but not in insertion order.
+}
+
 static void print_promise(JS::Promise const& promise, HashTable<JS::Object*>& seen_objects)
 {
     print_type("Promise");
@@ -982,6 +990,8 @@ static void print_value(JS::Value value, HashTable<JS::Object*>& seen_objects)
             return print_map(static_cast<JS::Map&>(object), seen_objects);
         if (is<JS::Set>(object))
             return print_set(static_cast<JS::Set&>(object), seen_objects);
+        if (is<JS::WeakMap>(object))
+            return print_weak_map(static_cast<JS::WeakMap&>(object), seen_objects);
         if (is<JS::DataView>(object))
             return print_data_view(static_cast<JS::DataView&>(object), seen_objects);
         if (is<JS::ProxyObject>(object))
-- 
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