tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,                                /* Allow javascript files to be compiled. */
    "checkJs": true,                                /* Report errors in .js files. */
    "declaration": true,                            /* Generates corresponding '.d.ts' file. */
    "emitDeclarationOnly": true,
    "declarationMap": false,                        /* Generates a sourcemap for each corresponding '.d.ts' file. */
    "forceConsistentCasingInFileNames": true,       /* Disallow inconsistently-cased references to the same file. */
    "module": "es2020",                             /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    "outDir": "./types/",                           /* Redirect output structure to the directory. */
    "removeComments": false,                        /* Emit comments to output. */
    "rootDir": "./lib",                             /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "skipLibCheck": true,                           /* Skip type checking of declaration files. */
    "sourceMap": false,                             /* Generates corresponding '.map' file. */
    "strict": true,                                 /* Enable all strict type-checking options. */
    "target": "es2020",                             /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "noEmitOnError": true,
  },
  "include": ["./lib/index.js"]
}