I've been thinking about this a lot recently. For most of my career I've been a Java programmer and for the majority of projects, each class is put in its own f

I've been thinking about this a lot recently. For most of my career I've been a Java programmer and for the majority of projects, each class is put in its own file. The amount of jumping (between files / following method calls) can get really tedious when you're trying to grok a code base. I've been working on Typescript projects recently where the standard has been to have slightly larger files -- possibly containing a class definition, but more often it's an entire module -- and it's actually been kind of nice to just read the entire thing top to bottom in one go. I've looked for studies on "locality" of source code, but haven't really found anything.