Relativity Review extension scripts contents should be valid ECMAScript 5.1. This will help to ensure your extension's compatibility with browsers such as Internet Explorer. Neither Relativity nor the Relativity Review application will transpile extension scripts written in ECMAScript 6, TypeScript or ES Next. It is highly recommended that you test your extension in multiple browsers to ensure compatibility.
If you would like to use features available in later versions of ECMAScript or if you would like to write your extension in TypeScript, make sure to transpile your extension source code to valid ECMAScript 5.1 before uploading it as a resource file to your Relativity application.
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For more infromation about Relativity browser compatibility and ECMAScript, see:
ae547acda... HYDRO-14441 hide empty Annotations folder and Typescript page referencing npm package that is not publicly available