tsconfig.json

{
  "compilerOptions": {
    "preserveConstEnums": true,
    "sourceMap": true,
    "target": "ES2018" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
    "module": "CommonJS" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
    "lib": [
      "dom",
      "es6",
      "es2015.promise"
    ] /* Specify library files to be included in the compilation. */,
    "moduleResolution": "node",
    "esModuleInterop": true,
    "downlevelIteration": true,
    "resolveJsonModule": true,
    "noUnusedLocals": false,
    "allowJs": true,
    "skipLibCheck": true,
    "outDir": "lib",
  },
  "typeRoots": ["./types", "./node_modules"],
  "include": ["src/**/*"],
  "exclude": [
    "**/__tests__/**/*",
    "**/build/**/*",
    "node_modules",
    "lib",
    "./*.config.js",
    "*.json"
  ]
}