foundry-vtt-types

TypeScript type definitions for Foundry Virtual Tabletop (unofficial)

Supported Foundry VTT versions

We aim to support the latest release of each Foundry VTT version (0.7, 0.8, 9, etc.), starting with 0.7.

At the moment, versions 0.7, 0.8, and 9 are fully supported with partial support for versions 10, 11, and 12. Work on support for version 13 is currently underway.

V13 Installation

Currently v13 is still in beta. There are known bugs, issues in the ergonomics, and major unfinished work in the current implementation. To get a direct line of communication about the current status of development as well as to help us understand what areas need to be prioritized first, join the League of Extraordinary FoundryVTT Developers Discord or file an issue.

The recommended way to install for v13 is this command:

npm add -D fvtt-types@github:League-of-Foundry-Developers/foundry-vtt-types#main

Alternatively, if you're using yarn you'll need to use the command yarn add --dev fvtt-types@github:League-of-Foundry-Developers/foundry-vtt-types#main.

This will add the current commit on main as a dependency. Both npm and yarn's lockfile will store the commit you initially installed this command and so updates to your dependency will not happen automatically or even after a fresh install. To update you will need to be rerun the prior command periodically to update as improvements are added frequently.

Installation

You can install historical versions of foundry-vtt-types from the npm registry.

In order to install the latest stable version (v9), run

npm add --save-dev fvtt-types@npm:@league-of-foundry-developers/foundry-vtt-types

In order to install a specific version run

npm add --save-dev fvtt-types@npm:@league-of-foundry-developers/foundry-vtt-types@<version>

For example, to install version 9.268.0, run

npm add --save-dev fvtt-types@npm:@league-of-foundry-developers/[email protected]

You can then update foundry-vtt-types using the regular update mechanism for npm (see npm update).

Versioning scheme

The versions of the foundry-vtt-types correspond to the releases of Foundry VTT. The versioning scheme of Foundry VTT changed with version 9, so the versioning scheme for the foundry-vtt-types also changes with that version:

• For Foundry VTT version 0.7 and 0.8, the versioning scheme is

  0.<foundy-minor-version>.<foundry-patch-version>-<increment>
  

• For Foundry VTT version 9 and onwards, the versioning scheme is

  <foundry-version>.<foundry-build>.<increment>
  

  In both cases, increment is a number that increases with every individual release of the foundry-vtt-types for that Foundry VTT release.

Usage

Add foundry-vtt-types to your types section in your tsconfig.json:

{
  "compilerOptions": {
    "types": ["fvtt-types"],
    "target": "esnext",
    "moduleResolution": "bundler",
    "strict": true
  }
}

Compiler Option Notes:

• types is set to make fvtt-types globally available in your project. Without it global variables like game and CONFIG won't appear.
• "target": "esnext" is recommended because Foundry lives on the bleeding edge of JavaScript features. If you want to downlevel your code setting "lib": ["esnext", "dom"] and target is reasonable but TypeScript's downlevelling is not the most advanced and so it's probably a good idea to leave this to other tools. It's a bad idea to lower the lib version as Foundry will frequently use new JavaScript features. Nevertheless the minimum out of the box usable lib is es2022 as before that types like WeakRef won't exist.
• Using "strict": true is highly recommended because it enables a whole host of useful options. However if you want to check that your config supports foundry-vtt-types, the most important settings under strict would be strictNullChecks and strictFunctionTypes.
• Changing the moduleResolution is generally not recommended. Only new moduleResolution strategies have support for certain imports like "fvtt-types/utils". For example the Node moduleResolutions above node16 may work but have additional Node-only constraints not relevant to the browser.

You can find some information about how to actually work with the type definitions in the Wiki. A good starting point is the FAQ.

Acknowledgments

Originally forked from Foundry Project Creator Types by @NickEastNL

Contributing

Contributions are very welcome in order to decrease the individual workload. Filing issues for wrong / missing types is also a great way to help us improve the type definitions.

Development on the current version of Foundry VTT is done on the main branch. Additionally, we keep branches for the older version of Foundry VTT that we still support. These branches are named according to the Foundry VTT version they correspond to. For example, the branch for Foundry VTT 0.8 is called foundry-0.8.x. All work to improve the type definitions needs to be done through Pull Requests to the relevant branch.

Please read CONTRIBUTING.md for more details on how to contribute.

If you have any specific questions, feel free to contact us in the League of Extraordinary Foundry Developers Discord.

Type-Checking, Linting, Testing

When contributing, make sure that the type checks pass, the linter is green and the tests are green. We do have checks in the CI but running this locally also helps you while developing and saves you time as you don't have to wait for the CI.

You can run type checking and linting with the following command:

npm run lint

You can run the tests with

npm run test

Creating a release

To create a release, you have to create a new release commit, tag it and create a GitHub release from that. The CI will handle the rest.

npm version <release-type>
git push --follow-tags

License

This project is licensed under the MIT license. You can find a copy at LICENSE.