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https://github.com/JohnnyMorganz/luau-lsp

Language Server Implementation for Luau
https://github.com/JohnnyMorganz/luau-lsp

hacktoberfest language-server lsp lua luau

Last synced: 19 days ago
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Language Server Implementation for Luau

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README 

          
# Luau Language Server



An implementation of a language server for the [Luau](https://github.com/Roblox/luau) programming language.



## Getting Started



Install the extension from the VSCode Marketplace or OpenVSX Registry:



- VSCode Marketplace: https://marketplace.visualstudio.com/items?itemName=JohnnyMorganz.luau-lsp

- OpenVSX Registry: https://open-vsx.org/extension/JohnnyMorganz/luau-lsp



Alternatively, check out [Getting Started for Language Server Clients](https://github.com/JohnnyMorganz/luau-lsp/blob/main/editors/README.md)

to setup your own client for a different editor.



A [Nightly Release](https://github.com/JohnnyMorganz/luau-lsp/actions/workflows/nightly.yml) runs every day with the latest changes on main.

You can download the relevant release for your platform and manually install the `.vsix`.

The nightly release builds with debug symbols and profiling instrumentation for debugging.



### For General Users



The language server will start working immediately for general Luau code. There is built-in support

for Luau's generalised [require-by-string semantics](https://rfcs.luau.org/new-require-by-string-semantics.html), using `require("./module")`.



To provide global type definitions for a custom environment, specify `luau-lsp.types.definitionFiles`.

Corresponding documentation is configured using `luau-lsp.types.documentationFiles`.



If you use Luau in a different environment and are interested in using the language server, or

looking for any specific features, please get in touch!



### For Rojo Users (requires `v7.3.0+`)



By default, the latest Roblox type definitions and documentation are preloaded out of the box.

This can be disabled by configuring `luau-lsp.platform.type`.



The language server uses Rojo-style sourcemaps to resolve DataModel instance trees for intellisense.

This is done by running `rojo sourcemap --watch default.project.json --output sourcemap.json`.

The server listens to changes of a `sourcemap.json` file present at the workspace root. It is recommended to add this

file to your `.gitignore`.



The following settings are configurable for sourcemap generation:



- `luau-lsp.sourcemap.enabled`: Whether sourcemap support is enabled (default: on)

- `luau-lsp.sourcemap.autogenerate`: Whether sourcemaps are automatically generated by the client. If disabled, the server will listen to manual changes to a `sourcemap.json` file (default: on)

- `luau-lsp.sourcemap.rojoProjectFile`: What project file to use (default: `default.project.json`)

- `luau-lsp.sourcemap.includeNonScripts`: Whether to include non script instances in the sourcemap. May be disabled for expensive DataModels (default: on)

- `luau-lsp.sourcemap.sourcemapFile`: What sourcemap file to use (default: `sourcemap.json`)



If you do not use Rojo, you can still use the Luau Language Server, you just need to manually generate a `sourcemap.json`

file for your particular project layout. You can configure `luau-lsp.sourcemap.generatorCommand` to run a custom generator.

If your generator does not support file watching, enable `luau-lsp.sourcemap.useVSCodeWatcher`.



> Note: in the diagnostics type checker, the types for DataModel (DM) instances will resolve to `any`. This is a current limitation to reduce false positives.

> However, autocomplete and hover intellisense will correctly resolve the DM type.

> To enable this mode for diagnostics, set `luau-lsp.diagnostics.strictDatamodelTypes` (off by default).

> [Read more](https://github.com/JohnnyMorganz/luau-lsp/issues/83#issuecomment-1192865024).



**A companion Studio plugin is available to provide DataModel information for Instances which are not part of your Rojo build / filetree: [Plugin Marketplace](https://www.roblox.com/library/10913122509/Luau-Language-Server-Companion)**



## Standalone



The tool can run standalone, similar to [`luau-analyze`](https://github.com/JohnnyMorganz/luau-analyze-rojo), to provide type and lint warnings in CI, with full Rojo resolution and API types support.

The entry point for the analysis tool is `luau-lsp analyze`.



Install the binary and run `luau-lsp --help` for more information.



## Configuration



There are 2 types of configuration styles for the language server. General configuration is provided by `.luaurc` files,

which allow you to configure language strictness, lints, and require aliases. More information is available in Luau's [RFC documentation](https://rfcs.luau.org/config-luaurc.html).



The second configuration style is specific to the language server. See `luau-lsp` in your editor's settings for more details.



## Supported Features



- [x] Diagnostics (incl. type errors)

- [x] Autocompletion

- [x] Hover

- [x] Signature Help

- [x] Go To Definition

- [x] Go To Type Definition

- [x] Find References

- [x] Document Link

- [x] Document Symbol

- [x] Color Provider

- [x] Rename

- [x] Semantic Tokens

- [x] Inlay Hints

- [x] Documentation Comments ([Moonwave Style](https://github.com/evaera/moonwave) - supporting both `--- comment` and `--[=[ comment ]=]`, but must be next to statement)

- [x] Code Actions

- [x] Workspace Symbols

- [x] Folding Range

- [x] Call Hierarchy



The following are extra features defined in the LSP specification, but most likely do not apply to Luau or are not necessary.

They can be investigated at a later time:



- [ ] Go To Declaration (do not apply)

- [ ] Go To Implementation (do not apply)

- [ ] Code Lens (not necessary)

- [ ] Document Highlight (not necessary - editor highlighting is sufficient)

- [ ] Selection Range (not necessary - editor selection is sufficient)

- [ ] Inline Value (applies for debuggers only)

- [ ] Moniker

- [ ] Formatting (see [stylua](https://github.com/JohnnyMorganz/StyLua))

- [ ] Type Hierarchy (Luau currently does not provide any [public] ways to define type hierarchies)



## Crash Reporting



The language server implements opt-in crash reporting, using [Sentry](https://sentry.io/).



On VSCode, this is configured via the setting `luau-lsp.server.crashReporting.enabled`.

When a crash is encountered, an out-of-process crash handler will upload the crash details to Sentry via HTTP.



When a crash is reported, the report stores the following information:



- Crash reason and thread stack trace

- Device metadata: OS name, version and CPU architecture

- Dynamic libraries loaded into the process (including filesystem paths)



This information is transferred through a [Minidump](https://docs.sentry.io/platforms/native/guides/minidumps/#what-is-a-minidump) file.

This file is not stored after processing. No general usage data is recorded.



Crash Reporting is only available for Windows and macOS, and is not active for Standalone mode (`luau-lsp analyze`)



## Build From Source



```sh

mkdir build && cd build

cmake .. -DCMAKE_BUILD_TYPE=Release

cmake --build . --target Luau.LanguageServer.CLI --config Release

```