I'm not really sure what Amazon has to do with this, but the problem you described - "I changed the API and forgot to update a part of the application" - is exa

I'm not really sure what Amazon has to do with this, but the problem you described - "I changed the API and forgot to update a part of the application" - is exactly what type checking is for. This is not a "JS community has a thing for..." bit, this applies to any programming language.