1 files changed, 57 insertions, 0 deletions
diff --git a/extensions/console/02_console.js b/extensions/console/02_console.js
index 6f2ed0c0e..b4b29e1ea 100644
--- a/extensions/console/02_console.js
+++ b/extensions/console/02_console.js
@@ -87,6 +87,10 @@
     MathFloor,
     Number,
     NumberPrototypeToString,
+    Proxy,
+    ReflectGet,
+    ReflectGetOwnPropertyDescriptor,
+    ReflectGetPrototypeOf,
     WeakMap,
     WeakSet,
   } = window.__bootstrap.primordials;
@@ -1953,6 +1957,58 @@
     });
   }
 
+  /** Creates a proxy that represents a subset of the properties
+   * of the original object optionally without evaluating the properties
+   * in order to get the values. */
+  function createFilteredInspectProxy({ object, keys, evaluate }) {
+    return new Proxy({}, {
+      get(_target, key) {
+        if (key === SymbolToStringTag) {
+          return object.constructor?.name;
+        } else if (ArrayPrototypeIncludes(keys, key)) {
+          return ReflectGet(object, key);
+        } else {
+          return undefined;
+        }
+      },
+      getOwnPropertyDescriptor(_target, key) {
+        if (!ArrayPrototypeIncludes(keys, key)) {
+          return undefined;
+        } else if (evaluate) {
+          return getEvaluatedDescriptor(object, key);
+        } else {
+          return getDescendantPropertyDescriptor(object, key) ??
+            getEvaluatedDescriptor(object, key);
+        }
+      },
+      has(_target, key) {
+        return ArrayPrototypeIncludes(keys, key);
+      },
+      ownKeys() {
+        return keys;
+      },
+    });
+
+    function getDescendantPropertyDescriptor(object, key) {
+      let propertyDescriptor = ReflectGetOwnPropertyDescriptor(object, key);
+      if (!propertyDescriptor) {
+        const prototype = ReflectGetPrototypeOf(object);
+        if (prototype) {
+          propertyDescriptor = getDescendantPropertyDescriptor(prototype, key);
+        }
+      }
+      return propertyDescriptor;
+    }
+
+    function getEvaluatedDescriptor(object, key) {
+      return {
+        configurable: true,
+        enumerable: true,
+        value: object[key],
+      };
+    }
+  }
+
   // A helper function that will bind our own console implementation
   // with default implementation of Console from V8. This will cause
   // console messages to be piped to inspector console.
@@ -1997,5 +2053,6 @@
     customInspect,
     inspect,
     wrapConsole,
+    createFilteredInspectProxy,
   };
 })(this);