tsconfig.json

This file is used to let TypeScript know what you're doing and get TypeScriptToLua to do what you want

{
    "compilerOptions": {
        "lib": ["es2017"],
        "strict": true,
        "outDir": "game",
        "rootDir": "src",
        "types": [
            "love-typescript-definitions",
            "lua-types/jit"
        ]
    },
    "tstl": {
        "luaTarget": "JIT"
    }
}

Option	Effects	Description
rootDir	File System	The directory where your TypeScript files are
outDir	File System	The directory where Lua files will go (same structure as rootDir)
luaTarget	Output Lua	Can be jit, 5.3, 5.2 or 5.1
lib	Typings	Describes, to TypeScript, what environmental definitions exist
types	Typings	A list of paths to the declarations you wish to use
strict	Typings	Enables a collection of strict rules

Other more confusing options

Option	Effects	Description
baseUrl	Typings + Output Lua	The directory where non-relative module paths resolve

Relevant Links

• tsconfig.json tsconfig.json's general info
• Compiler Options (can be placed in tsconfigs)