1 files changed, 28 insertions, 0 deletions
diff --git a/app/javascript/mastodon/db/async.js b/app/javascript/mastodon/db/async.js
new file mode 100644
index 000000000..e08fc3f3d
--- /dev/null
+++ b/app/javascript/mastodon/db/async.js
@@ -0,0 +1,28 @@
+import { me } from '../initial_state';
+
+export default new Promise((resolve, reject) => {
+  // Microsoft Edge 17 does not support getAll according to:
+  // Catalog of standard and vendor APIs across browsers - Microsoft Edge Development
+  // https://developer.microsoft.com/en-us/microsoft-edge/platform/catalog/?q=specName%3Aindexeddb
+  if (!me || !('getAll' in IDBObjectStore.prototype)) {
+    reject();
+    return;
+  }
+
+  const request = indexedDB.open('mastodon:' + me);
+
+  request.onerror = reject;
+  request.onsuccess = ({ target }) => resolve(target.result);
+
+  request.onupgradeneeded = ({ target }) => {
+    const accounts = target.result.createObjectStore('accounts', { autoIncrement: true });
+    const statuses = target.result.createObjectStore('statuses', { autoIncrement: true });
+
+    accounts.createIndex('id', 'id', { unique: true });
+    accounts.createIndex('moved', 'moved');
+
+    statuses.createIndex('id', 'id', { unique: true });
+    statuses.createIndex('account', 'account');
+    statuses.createIndex('reblog', 'reblog');
+  };
+});