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JsLIGO: list concatenation helper

E. Rivas requested to merge er433/jsligo/list-concat into dev

Motivation and Context

It was Benjamin's suggestion to add a way of writing list concatenation in JsLIGO.


We add support for it as list([...xs, ...ys]).


  • 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)


Introduce a new way of doing list concatenation in JsLIGO:

const xs = list([1, 2, 3]);
const ys = list([4, 5]);
const zs = list([...xs, ...ys]);


  • 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 E. Rivas

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