tsconfig.json

{
    "compilerOptions": {
        /* Basic Options */
        "target": "ES2015", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
        "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
        "declaration": true, /* Generates corresponding '.d.ts' file. */
        "outDir": "./lib", /* Redirect output structure to the directory. */
        "rootDir": "./src", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */

        /* Strict Type-Checking Options */
        "strict": true, /* Enable all strict type-checking options. */
        "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */

        /* Additional Checks */
        "noUnusedLocals": true, /* Report errors on unused locals. */
        "noUnusedParameters": true /* Report errors on unused parameters. */
    },
    "exclude": [
        "node_modules",
        "test",
        "lib"
    ]
}