tsconfig.json

{
    "compilerOptions": {
      "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
      "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
      "lib": ["es6"],                             /* Specify library files to be included in the compilation. */
      "declaration": true,                   /* Generates corresponding '.d.ts' file. */
      "outDir": "./lib",
      "strict": true,                           /* Enable all strict type-checking options. */
      "esModuleInterop": true,                  
      "skipLibCheck": true,                     /* Skip type checking of declaration files. */
      "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
    },
    "include": ["./src", "jest.config.js"],
    "exclude": ["node_modules", "**/__test__/*"]
  }