[noema]

This doesn't conform with any of my experiences in non-trivial JS codebases. Migrating to TS tends to reveal previously overlooked implicit typing issues. Also, I find the "upfront productivity loss" of TS to be overstated: adding in annotations here and there doesn't take much time at all, and pays dividends quickly. Many hours have been lost tracking down some elusive runtime bug stemming from a typo in a vanilla JS property access.