1 files changed, 57 insertions, 0 deletions
diff --git a/includes/external/matrix/node_modules/matrix-js-sdk/lib/indexeddb-helpers.js b/includes/external/matrix/node_modules/matrix-js-sdk/lib/indexeddb-helpers.js
new file mode 100644
index 0000000..2714e1b
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+++ b/includes/external/matrix/node_modules/matrix-js-sdk/lib/indexeddb-helpers.js
@@ -0,0 +1,57 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.exists = exists;
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/**
+ * Check if an IndexedDB database exists. The only way to do so is to try opening it, so
+ * we do that and then delete it did not exist before.
+ *
+ * @param indexedDB - The `indexedDB` interface
+ * @param dbName - The database name to test for
+ * @returns Whether the database exists
+ */
+function exists(indexedDB, dbName) {
+  return new Promise((resolve, reject) => {
+    let exists = true;
+    const req = indexedDB.open(dbName);
+    req.onupgradeneeded = () => {
+      // Since we did not provide an explicit version when opening, this event
+      // should only fire if the DB did not exist before at any version.
+      exists = false;
+    };
+    req.onblocked = () => reject(req.error);
+    req.onsuccess = () => {
+      const db = req.result;
+      db.close();
+      if (!exists) {
+        // The DB did not exist before, but has been created as part of this
+        // existence check. Delete it now to restore previous state. Delete can
+        // actually take a while to complete in some browsers, so don't wait for
+        // it. This won't block future open calls that a store might issue next to
+        // properly set up the DB.
+        indexedDB.deleteDatabase(dbName);
+      }
+      resolve(exists);
+    };
+    req.onerror = () => reject(req.error);
+  });
+}
+//# sourceMappingURL=indexeddb-helpers.js.map
+\ No newline at end of file