Have you been looking for a low impact way to add Typescript? I wrote a tutorial:https://devblogs.microsoft.com/typescript/how-to-upgrade-to-typescript-without-anybody-noticing-part-1/ …
Large part of what makes TypeScript effective is the ability to start using it incrementally. Most companies don't want to switch to new tools unless there is a visible proof that it helps with their existing applications. Step by step, improving documentation etc. allows that.