Babylon.js/Exporters/Unity 5/EditorToolkit/Assets/Babylon/Templates/Config/options.json

{
    "compilerOptions": {
        "target": "ES5",
        "module": "system",
        "allowJs" : false,
        "declaration": true,
        "outFile": "###OUTFILE###",
        "sourceMap": false
    },
    "include": [
        "assets/**/*"
    ]    
}