Typing in a separate file defeats almost all the benefits of typing. Being able to read the code without also having to open a second source, the documentation.

Typing in a separate file defeats almost all the benefits of typing. Being able to read the code without also having to open a second source, the documentation. It's almost as bad as going back to stoneage c++ with header/source split up in separate files. Reading and writing types should be fast, agile, easy and effortless. Only way to acheive that is having it as close the usage as possible