use reflow to migrate from flow to typescript

scm-ui/ui-components/src/MailLink.tsx

@@ -0,0 +1,17 @@
+import React from 'react';
+
+type Props = {
+  address?: string;
+};
+
+class MailLink extends React.Component<Props> {
+  render() {
+    const { address } = this.props;
+    if (!address) {
+      return null;
+    }
+    return <a href={'mailto:' + address}>{address}</a>;
+  }
+}
+
+export default MailLink;