Starting a REPL

A REPL (Read Eval Print Loop) buffer is automatically open when a new Indium connection is made (see Getting up and running).


The REPL offers the following features:

  • Auto completion with company-mode
  • JS syntax highlighting
  • Pretty printing and preview of printed values
  • Access to the object inspector (see The inspector)

Using the REPL


Here is the list of available keybindings in a REPL buffer:

Keybinding Description
RET Evaluate the current input. When the point is on a printed object, inspect the object.
C-RET Insert a newline.
C-c M-i Evaluate the current input and open an inspector on the result.
C-c C-o Clear the output.
C-c C-q Kill the REPL buffer and close the current connection.
M-n Insert the previous input in the history.
M-p Insert the next input in the history.

Reconnecting from the REPL buffer

When a connection is closed (most probably because other devtools were open on the same runtime), the REPL will display two buttons, one to try to reopen the connection, and another one to kill Emacs buffers using this connection (the REPL buffer, inspectors & debuggers).

Code evaluation & context

When evaluating code in the REPL, Indium will always run the code on the current execution context.

This means that while debugging, code execution will happen in the context of the current stack frame, and will be able to access local variables from the stack, etc.