Migrate UnknownBody to TypeScript

src/components/views/messages/UnknownBody.tsx

@@ -0,0 +1,34 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+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 React, { forwardRef } from "react";
+import { MatrixEvent } from "matrix-js-sdk/src";
+
+interface IProps {
+    mxEvent: MatrixEvent;
+    children?: React.ReactNode;
+}
+
+export default forwardRef(({ mxEvent, children }: IProps, ref: React.RefObject<HTMLSpanElement>) => {
+    const text = mxEvent.getContent().body;
+    return (
+        <span className="mx_UnknownBody" ref={ref}>
+            { text }
+            { children }
+        </span>
+    );
+});