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diff --git a/common/stored_types.mjs b/common/stored_types.mjs
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+/**
+* Myext stored item types "enum"
+*
+* Copyright (C) 2021 Wojtek Kosior
+*
+* Dual-licensed under:
+*   - 0BSD license
+*   - GPLv3 or (at your option) any later version
+*/
+
+/*
+ * Key for item that is stored in quantity (script, page) is constructed by
+ * prepending its name with first letter of its list name. However, we also
+ * need to store some items that don't belong to any list. Let's call them
+ * persisted variables. In such case item's key is its "name" prepended with
+ * an underscore.
+ */
+
+const TYPE_PREFIX = {
+    PAGE : "p",
+    BUNDLE : "b",
+    SCRIPT : "s",
+    VAR : "_"
+};
+
+const TYPE_NAME = {
+    [TYPE_PREFIX.PAGE] : "page",
+    [TYPE_PREFIX.BUNDLE] : "bundle",
+    [TYPE_PREFIX.SCRIPT] : "script"
+}
+
+const list_prefixes = [
+    TYPE_PREFIX.PAGE,
+    TYPE_PREFIX.BUNDLE,
+    TYPE_PREFIX.SCRIPT
+];
+
+export {TYPE_PREFIX, TYPE_NAME, list_prefixes};