tsconfig.json

{
    "compilerOptions": {
        "target": "es5",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
        "allowJs": true,                       /* Allow JavaScript files to be compiled. */
        "sourceMap": true,                     /* Generates corresponding '.map' file. */
        "removeComments": false,               /* Do not emit comments to output. */
        "strict": true,                        /* Enable all strict type-checking options. */
        "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
        "noUnusedLocals": true,                /* Report errors on unused locals. */
        "noUnusedParameters": true,            /* Report errors on unused parameters. */
        "noImplicitReturns": true              /* Report error when not all code paths in function return a value. */
    },
    "exclude": [
        "node_modules"
    ]
}