Indeed I am working primarily on Rust now, though I used to write Node 2 years ago and this is one of pitfalls where I would like to rely on compiler. It was just one issue which could been easily detected. Some debugging time was spent aligning SQL query parameters and mapping selected fields to the output type - the problem is that when there is some misalignment node does not raise exception, rather just passing undefined value. That's what takes time, to realize that there is a problem and then find the issue. Agreed that in general expert in node probably won't hit such issues, though how many experts do we have. Type safety checks, including runtime checks, are actually making technology more adoptable. It does not seem that typescript can do that well though.