is/tsconfig.json

{
    "compileOnSave": true,
    "compilerOptions": {
        "target": "es5",
        "strict": true,
        "declaration": true,
        "sourceMap": true,
        "outDir": ".",
        "lib": [
            "es2015"
        ]
    },
    "include": [
        "index.ts"
    ],
    "exclude": []
}