1 files changed, 56 insertions, 0 deletions
diff --git a/devtools/client/fronts/symbol-iterator.js b/devtools/client/fronts/symbol-iterator.js
new file mode 100644
index 0000000000..1f6cd2581c
--- /dev/null
+++ b/devtools/client/fronts/symbol-iterator.js
@@ -0,0 +1,56 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  FrontClassWithSpec,
+  registerFront,
+} = require("resource://devtools/shared/protocol.js");
+const {
+  symbolIteratorSpec,
+} = require("resource://devtools/shared/specs/symbol-iterator.js");
+const {
+  getAdHocFrontOrPrimitiveGrip,
+} = require("resource://devtools/client/fronts/object.js");
+
+/**
+ * A SymbolIteratorFront is used as a front end for the SymbolIterator that is
+ * created on the server, hiding implementation details.
+ */
+class SymbolIteratorFront extends FrontClassWithSpec(symbolIteratorSpec) {
+  form(data) {
+    this.actorID = data.actor;
+    this.count = data.count;
+  }
+
+  async slice(start, count) {
+    const result = await super.slice({ start, count });
+    return this._onResult(result);
+  }
+
+  async all() {
+    const result = await super.all();
+    return this._onResult(result);
+  }
+
+  _onResult(result) {
+    if (!result.ownSymbols) {
+      return result;
+    }
+
+    result.ownSymbols.forEach((item, i) => {
+      if (item?.descriptor) {
+        result.ownSymbols[i].descriptor.value = getAdHocFrontOrPrimitiveGrip(
+          item.descriptor.value,
+          this
+        );
+      }
+    });
+    return result;
+  }
+}
+
+exports.SymbolIteratorFront = SymbolIteratorFront;
+registerFront(SymbolIteratorFront);