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Configuration

TypeScriptToLua uses the same configuration file as the vanilla TypeScript compiler, loading it from the tsconfig.json file using the same rules as tsc.

Custom options

To customize transpilation behavior we add a new group of options to the tsconfig.json file. All of these options should be placed in a tstl object.

{
  "tstl": {
    // custom options
  }
}

Option	Values	Description
luaTarget	"JIT", "5.3", "5.2", "5.1" (default: "JIT")	Specifies the Lua version you want to generate code for.
noImplicitSelf	true, false (default: false)	If true, treats all project files as if they were prefixed with /** @noSelfInFile **/.
noHeader	true, false (default: false)	Set this to true if you don't want to include our header in the output.
luaLibImport	"inline", "require", "always", "none" (default: "require")	We polyfill certain JavaScript features with Lua functions, this option specifies how these functions are imported into the Lua output.
sourceMapTraceback	true, false (default: false)	Overrides Lua's debug.traceback to apply sourcemaps to Lua stacktraces. This will make error messages point to your original TypeScript code instead of the generated Lua.
luaBundle	File path (relative to the tsconfig.json)	Will bundle all output lua files into a single bundle file. Requires luaBundleEntry to be set!
luaBundleEntry	File path (relative to the tsconfig.json)	This should be the name/path of the TS file in your project that will serve as entry point to the bundled code.
luaPlugins	Array<{ name: string; import?: string }>	List of TypeScriptToLua plugins.

Standard options

Most of the standard TypeScript options work without any changes. Notable unsupported options are:

• composite, build
• incremental
• emitDecoratorMetadata
• esModuleInterop

Some options do not apply to TypeScriptToLua and are ignored:

• outFile - use luaBundle instead.
• importHelpers, noEmitHelpers - use luaLibImport instead.
• target, module - it's only effect is limiting some features, so prefer to set it to esnext. If TypeScript requires you to specify different module type because you want to bundle your declarations with outFile, consider using API Extractor instead.

Transformers

Transformers is a powerful feature of TypeScript that allows you to modify behavior of your program during compilation. While TypeScript currently does not provide a user-facing way to use transformers, TypeScriptToLua allows you to specify them in the configuration file, following ttypescript format.

Example:

{
  "compilerOptions": {
    "plugins": [{ "transform": "dota-lua-types/transformer" }]
  }
}