Convert submit-rageshake to typescript

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/@types/global.d.ts

@@ -0,0 +1,40 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import * as ModernizrStatic from "modernizr";
+
+declare global {
+    interface Window {
+        Modernizr: ModernizrStatic;
+        Olm: {
+            init: () => Promise<void>;
+        };
+    }
+
+    // workaround for https://github.com/microsoft/TypeScript/issues/30933
+    interface ObjectConstructor {
+        fromEntries?(xs: [string|number|symbol, any][]): object
+    }
+
+    interface Document {
+        // https://developer.mozilla.org/en-US/docs/Web/API/Document/hasStorageAccess
+        hasStorageAccess?: () => Promise<boolean>;
+    }
+
+    interface StorageEstimate {
+        usageDetails?: {[key: string]: number};
+    }
+}