We're still using JavaScript and Node.js, but try to stick with TypeScript for new services and modules. About the benefits of static typing much has been written, in short it:

• offers better maintainability and discoverability of existing code bases
• provides reasonable type safety, which frees us from writing a huge chunk of unit tests and mitigates a large set of problems that are caught in compilation
• affords a new level of expressiveness via types

Nothing is without trade offs; we are aware of, and accept that:

• fighting the compiler can be frustrating
• it adds to the already large list of skills a web developer has to learn
• it adds another piece to the already large set of tools necessary to get code from development to production