Skip to content

[JsLIGO] Refactoring of the CST and grammar

Christian Rinderknecht requested to merge rinderknecht@refactoring_jsligo into dev

Motivation and Context


#1269 (closed)

Other changes:

  • true, false become keywords (and thus stdlib is updated).
  • new support for pattern matching
  • do { ... } expressions
  • Added 0nat and 0mutez literals
  • Added bitwise operators
  • Added access to properties with integers and strings
  • More patterns


  • 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)


New pattern matching in JsLIGO

It follows a variant of tc39 proposal pattern matching.


match (action) {
    when(Add(n)): n;
    when(Sub(n)): -n;


  • If a new syntax has been introduced, put a message on slack ligo-lsp
  • 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).
Edited by Christian Rinderknecht

Merge request reports