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[#1675] Add module signatures on hover

Leonid Vasilev requested to merge dk318/#1675-module-signatures-on-hover into dev

Motivation and Context


Right now there is a (* ... *) placeholder for module signatures on hover. Let's fill it with the right signature.


Propagate signatures like types inside types pass in the scopes module. Decompile these Ast_typed.signature and use pretty printers to show them to the user.

Related issues

Resolves #1675 (closed) .

Checklist for the LIGO Language Server

  • I checked whether I need to update the file for the plugin and did so if necessary:
    • If I implemented a new LSP request, I added it to the list of supported features that may be disabled
    • If I implemented a new LSP method, I added it to the list of supported functionality
  • I checked that my changes work in Emacs, Vim, and Visual Studio Code
  • (Before merging) The commit history is squashed and prettified, and follows the Serokell commit policy, or the MR is set to squash the commits



  • compiler
  • website
  • webide
  • vscode-plugin
  • debugger

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Performance improvement (non-breaking change that improves performance)
  • None (change with no changelog)


Added signatures for modules on hovering. They're displayed like:

module Bytes : sig
  val concats : bytes list -> bytes

  val pack : a -> bytes

  val unpack : bytes -> a option

  val length : bytes -> nat

  val concat : bytes -> bytes -> bytes

  val sub : nat -> nat -> bytes -> bytes



  • Changes follow the existing coding style (use dune @fmt to check).
  • Tests for the changes have been added (for bug fixes / feature).
  • Documentation has been updated.
  • Changelog description has been added (if appropriate).
  • Start titles under ## Changelog section with #### (if appropriate).
  • There is no image or uploaded file in changelog
  • Examples in changed behaviour have been added to the changelog (for breaking change / feature).

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