MoonScript
MoonScript is a programmer friendly language that compiles into
Lua. It gives you the power of the fastest scripting
language combined with a rich set of features. It runs on Lua 5.1 and above,
including alternative runtimes like LuaJIT.
See https://moonscript.org.
Online demo/compiler at https://moonscript.org/compiler.
We have a Discord for those interested in MoonScript and related projects. You can join us here: https://discord.gg/Y75ZXrD
Contributing
MoonScript is a self-hosted compiler, meaning it’s written in MoonScript itself. When contributing, please follow the following guidelines:
- Edit
.moon files, never modify the alongside .lua files directly
- After making changes to
.moon files, run the compiler to regenerate the corresponding .lua files
- Both
.moon and .lua files are included in the repository to ensure that:
- Users can install and use MoonScript without having to compile it themselves
- The compiler bootstrapping process works consistently
It’s helpful to have a separate installation of MoonScript should you break
something and you need to re-build the MoonScript with a working version of
MoonScript. You can check out the repo in another directory, or install it
using LuaRocks to have a separate working version.
The parser
The parser is defined as a pgen grammar in
moonscript/parse/grammar.moon, which is compiled to a native C module
(moonscript/parse/native.c) and a pure Lua equivalent
(moonscript/parse/slow.lua, unused at runtime, kept for a future Lua-only
distribution). Both generated files are checked in. After changing the
grammar, run make generate to rebuild them (requires the pgen and
clang-format).
Running Tests
Tests are written in MoonScript and use Busted.
In order to run the tests you must have MoonScript and Loadkit installed.
To run tests, execute from the root directory:
busted
Writing specs is a bit more complicated. Check out the spec writing guide.
Binaries
Precompiled versions of MoonScript are provided for Windows. You can find them
in the GitHub releases page.
(Scroll down to the win32- tags.
The build code can be found in the binaries
branch
Editor Support
License (MIT)
Copyright © 2025 by Leaf Corcoran
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the “Software”), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
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