Rewrite to allow for multiple, independent stores.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tp/tp-store",
-  "version": "1.1.2",
+  "version": "2.0.0",
   "description": "",
   "main": "tp-store.js",
   "scripts": {

store.js

@@ -1,21 +1,22 @@
 /**
 @license
-Copyright (c) 2022 trading_peter
+Copyright (c) 2025 trading_peter
 This program is available under Apache License Version 2.0
 */
 
-const data = new Map();
+export class Store {
-const instancesPerKey = new Map();
+  constructor() {
+    this._data = new Map();
+    this._instancesPerKey = new Map();
+  }
 
   /**
- * # Store
+   * Subscribe instance properties to store changes
- *
+   * @param {Object} instance - Instance to subscribe
- * A simple key value store.
+   * @param {string|Array<string|Object>} keys - Keys to subscribe to
    */
-export const Store = function(superClass) {
+  subscribe(instance, keys) {
-  return class extends superClass {
+    if (!Array.isArray(keys)) {
-    storeSubscribe(keys) {
-      if (Array.isArray(keys) === false) {
       keys = [keys];
     }
 
@@ -25,48 +26,19 @@ export const Store = function(superClass) {
         targetProperty = key.targetProperty;
         key = key.key;
       }
-        this._addInstance(this, key, targetProperty);
+      this._addInstance(instance, key, targetProperty);
     });
   }
 
-    storeUpdated(key, newValue, targetProperty) {
+  /**
-      this[targetProperty || key] = newValue;
+   * Write a value to the store
-    }
+   * @param {string} key - Key to write to
+   * @param {any} value - Value to store
+   */
+  write(key, value) {
+    this._data.set(key, value);
 
-    storeWrite(key, value) {
+    const instances = this._instancesPerKey.get(key);
-      this._writeKey(key, value);
-    }
-
-    disconnectedCallback() {
-      super.disconnectedCallback();
-      
-      // Clean up all references to this instance.
-      instancesPerKey.forEach((instances, key) => {
-        const remainingInstances = instances.filter(entry => entry.instance !== this);
-        if (remainingInstances.length === 0) {
-          instancesPerKey.delete(key);
-        } else {
-          instancesPerKey.set(key, remainingInstances);
-        }
-      });
-    }
-
-    _addInstance(instance, key, targetProperty) {
-      if (instancesPerKey.has(key) === false) {
-        instancesPerKey.set(key, [ { instance, targetProperty } ]);
-      } else {
-        instancesPerKey.get(key).push({ instance, targetProperty });
-      }
-
-      if (data.has(key)) {
-        this._notifyInstance(instance, key, data.get(key), targetProperty);
-      }
-    }
-
-    _writeKey(key, value) {
-      data.set(key, value);
-
-      const instances = instancesPerKey.get(key);
     if (Array.isArray(instances)) {
       instances.forEach(entry => {
         this._notifyInstance(entry.instance, key, value, entry.targetProperty);
@@ -74,8 +46,76 @@ export const Store = function(superClass) {
     }
   }
 
+  /**
+   * Read a value from the store
+   * @param {string} key - Key to read
+   * @returns {any} Stored value
+   */
+  read(key) {
+    return this._data.get(key);
+  }
+
+  /**
+   * Unsubscribe an instance from all store changes
+   * @param {Object} instance - Instance to unsubscribe
+   */
+  unsubscribe(instance) {
+    this._instancesPerKey.forEach((instances, key) => {
+      const remainingInstances = instances.filter(entry => entry.instance !== instance);
+      if (remainingInstances.length === 0) {
+        this._instancesPerKey.delete(key);
+      } else {
+        this._instancesPerKey.set(key, remainingInstances);
+      }
+    });
+  }
+
+  _addInstance(instance, key, targetProperty) {
+    if (!this._instancesPerKey.has(key)) {
+      this._instancesPerKey.set(key, [{ instance, targetProperty }]);
+    } else {
+      this._instancesPerKey.get(key).push({ instance, targetProperty });
+    }
+
+    if (this._data.has(key)) {
+      this._notifyInstance(instance, key, this._data.get(key), targetProperty);
+    }
+  }
+
   _notifyInstance(instance, key, value, targetProperty) {
+    if (instance.storeUpdated) {
       instance.storeUpdated(key, value, targetProperty);
+    } else {
+      instance[targetProperty || key] = value;
+    }
+  }
+}
+
+// Backwards compatibility layer for the mixin
+export const StoreSubcriber = function(superClass) {
+  return class extends superClass {
+    constructor() {
+      super();
+      this._store = window.defaultStore = window.defaultStore || new Store();
+    }
+
+    storeSubscribe(keys) {
+      this._store.subscribe(this, keys);
+    }
+
+    storeWrite(key, value) {
+      this._store.write(key, value);
+    }
+
+    disconnectedCallback() {
+      if (super.disconnectedCallback) {
+        super.disconnectedCallback();
+      }
+      this._store.unsubscribe(this);
+    }
+
+    storeUpdated(key, newValue, targetProperty) {
+      this[targetProperty || key] = newValue;
     }
   };
-}
+};