Start a REPL; connect to it. That's identical for every single editor/IDE. The problem is that editor plugin maintainers seem reluctant to encourage developers

Start a REPL; connect to it. That's identical for every single editor/IDE. The problem is that editor plugin maintainers seem reluctant to encourage developers to start REPLs manually so they have to deal with the whole issue of "how to start a REPL" -- which should be up to the developer, not the tool. I run REPLs for weeks, sometimes months, so I don't want my editor to start my REPL since my editor is going to get restarted a lot more often than my REPLs!