LoggingExtras allows routing logged information to different places when constructing complicated "log plumbing" systems. Built upon the concept of simple parts composed together, subtyping AbstractLogger provides a powerful and flexible definition for your logging system without a need to define any custom loggers. When we talk about composability, the composition of any set of Loggers is itself a Logger, and LoggingExtras is a composable logging system.
...Just start using your REPL normally. Once you hit an error you'll be presented with an interactive tree representing your stacktrace which you can explore. To turn interactive errors off and return to using normal stack traces call toggle(). Call toggle() again to turn it back on. Press up and down arrows to move through the stacktrace. Press space to fold or unfold the currently selected line. A + will appear on folded lines. Press enter once finished. If you are on a line that references a particular file then that will present additional options in the next menu. q can be pressed to exit back to the REPL.
...commands, but the as-you-type mode is not available (the keymap-based version works though, and it also works with some Vim commands like f and t). By default, this feature is only active when editing Julia files. However, it can be also enabled with other file types, and even turned on/off on the fly regardless of the file type.