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Type annotations for the Playdate SDK

SDK Version: 2.6.0

The file __types.lua contains annotations for the Playdate handheld console's Lua SDK.

This includes:

  • parameter and return types for (basically) all SDK functions, used for both autocomplete and type checking
  • documentation for all those functions that your IDE can show on hover

For example, if you have the following code:

local img = gfx.image.new(100, 100)

img.clear(gfx.kColorBlack) -- Bug! Period should be a colon
img:clear(gfx.kColorBlack) -- better

local synth = snd.synth.new(snd.kLFOSquare) -- Bug! That's an LFO type, not a waveform
synth = snd.synth.new(snd.kWaveSquare) -- better

your IDE will highlight the bugs as errors (if you configure it that way):

screenshot of the above code in Visual Studio Code, where the two bugs are highlighted with red underlines

Documentation for all those functions is also available on hover, so you don't always have to go back and forth between your IDE and the SDK documentation:

screenshot of Visual Studio Code showing documentation for image.fadedImage() on hover

Requirements

For this to work, your IDE needs to be able to handle Lua annotations.

If you're using Visual Studio Code or any other IDE with the Lua Language Server extension, you're all set!

Usage

Download the file __types.lua and place it into the CoreLibs directory of your Playdate SDK. That's the same folder where __stub.lua resides, which is the SDK-provided file for minimal autocomplete support.

I do in fact recommend deleting __stub.lua once you've placed __types.lua here.

Assuming the SDK was already working correctly in your IDE, then the language server (and thus your IDE) should pick this up immediately. If it doesn't, restarting your IDE should do the trick.

You can modify the language settings (in VS Code that would be in .vscode/settings.json in your project) to get the level of type strictness that you want. See the Diagnostics documentation for details.

License

The file __types.lua ("the File") was generated by Benjamin Dumke-von der Ehe ("the Author") based on the SDK documentation, which is published by Panic Inc. under the Playdate SDK License. Panic is not involved in the creation of the File and does not take any responsibility for its completeness or correctness. But Panic has given permission for this file to be published by the Author, and for the File to be used by anyone, as long as it's used under the same conditions as the Playdate SDK itself, as laid out in the Playdate SDK License.