DEV: implements `removeKeys(predicate)` in keyValueStore (#18019)

app/assets/javascripts/discourse/app/lib/key-value-store.js

@@ -26,14 +26,27 @@ export default class KeyValueStore {
   }
 
   abandonLocal() {
+    return this.removeKeys();
+  }
+
+  removeKeys(predicate = () => true) {
     if (!safeLocalStorage) {
       return;
     }
 
     let i = safeLocalStorage.length - 1;
+
     while (i >= 0) {
       let k = safeLocalStorage.key(i);
-      if (k.substring(0, this.context.length) === this.context) {
+      let v = safeLocalStorage[k];
+      try {
+        v = JSON.parse(v);
+      } catch (e) {}
+
+      if (
+        k.substring(0, this.context.length) === this.context &&
+        predicate(k, v)
+      ) {
         safeLocalStorage.removeItem(k);
       }
       i--;

app/assets/javascripts/discourse/tests/unit/lib/key-value-store-test.js

@@ -17,6 +17,21 @@ module("Unit | Utility | key-value-store", function () {
     assert.strictEqual(store.get("bob"), undefined);
   });
 
+  test("is able to remove multiple items at once from the store", function (assert) {
+    const store = new KeyValueStore("example");
+    store.set({ key: "bob", value: "uncle" });
+    store.set({ key: "jane", value: "sister" });
+    store.set({ key: "clark", value: "brother" });
+
+    store.removeKeys((key, value) => {
+      return key.includes("bob") || value === "brother";
+    });
+
+    assert.strictEqual(store.get("bob"), undefined);
+    assert.strictEqual(store.get("jane"), "sister");
+    assert.strictEqual(store.get("clark"), undefined);
+  });
+
   test("is able to nuke the store", function (assert) {
     const store = new KeyValueStore("example");
     store.set({ key: "bob1", value: "uncle" });