Complete interactive development program for Haskell

Version on this page:0.1.23
LTS Haskell 9.21:0.1.24
Stackage Nightly 2017-11-22:0.1.23
Latest on Hackage:0.1.32

See all snapshots intero appears in

BSD3 licensed by Chris Done, The University of Glasgow
Maintained by

Module documentation for 0.1.23

There are no documented modules for this package.

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Complete interactive development program for Haskell

Intero for Emacs

Please see the homepage for Intero for Emacs.

Default key bindings

Key binding Description
M-. Jump to definition
C-c C-i Show information of identifier at point
C-c C-t Show the type of thing at point, or the selection
C-u C-c C-t Insert a type signature for the thing at point
C-c C-l Load this module in the REPL
C-c C-c Evaluate the selected region in the REPL
C-c C-r Apply suggestions from GHC
C-c C-k Clear REPL
C-c C-z Switch to and from the REPL

Enabling intero

To enable intero in all haskell-mode buffers by default, enable intero-global-mode, by using M-x customize or by adding (intero-global-mode 1) to your Emacs start-up files.

Intero will then activate for all projects, and for files without a stack.yaml, it will assume the “global” project. If you want to use an alternate stack yaml configuration file (for example, when developing for multiple GHC versions), use M-x intero-stack-yaml to switch file. When switching configuration, you will asked whether you want to preserve this choice across emacs sessions for the given project.

Whitelisting/blacklisting projects

Some users prefer to enable Intero selectively. The custom variables intero-blacklist and intero-whitelist are provided for this purpose, and are honoured by intero-global-mode:

If the parent directory of a Haskell file is listed in intero-blacklist, then intero will not be enabled for that file, unless a parent directory of that file is also listed in intero-whitelist. In other words, whitelist entries take precedence. You can therefore blacklist / to disable intero in all projects unless they are whitelisted.

Intero support for other editors and IDEs

Although not supported by the Intero maintainers, integrations with other editors exist:

If you would like to build support into a new editor or IDE, please see


Issues are split into low/medium/high priorities which dictates which ones will be implemented first.


* Support for GHC 8.4.3

* Collecting type info no longer prints messages

* Support GHC 8.4

* Add experimental :fill command.

* :cd handles quoted filepaths properly

* Support for :move and :sleep

* More robust name finding, fixes bug

* Support completion of qualified identifiers

* Completion in the REPL gets updated properly when imports

* :unset -XFoo now works

* Re-add back collecting type info after any load

* Bring back :completion

* Fix bug in :type-at returning outer span info (

* Emacs mode automatically installs latest intero.
* intero-list-buffers command.
* Fix cl-case reference
* Add warning when used outside of stack exec/stack ghci
* Transfer to commercialhaskell

* Support --version

* Completion for module's local imports and definitions (
* Starting the REPL takes the targets chosen for the backend
* Prompt displays interrobang for cuteness (

* Support GHC 8
* Fix completion before any module is loaded (
* Add completion for custom commands
* Add data-files entry for Emacs Lisp code
* Collect type-info whenever anything is loaded (

* Don't use -dynamic on Windows.

* Remove "flags: " message

* Make better, more liberal :type-at (
* Better argument parser for :type-at, :loc-at, :uses
* Retain names that were in scope after a successful load for :complete

* Add upper bound for GHC (

* Fix cache invalidation bug for interpreted mode (

* Added test suite
* Fix bug in :type-at that excluded a type constraint (

* Fixed bug in :uses, by using location equality.
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