tsconfig.json

{
  "include": [
    "src/**/*"
  ],
  "compilerOptions": {
    "target": "es5",                                     /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "module": "commonjs",                                /* Specify what module code is generated. */
    "outDir": "./dist",                                   /* Specify an output folder for all emitted files. */
    "lib": [
      "es2015",
      "DOM"
    ],
    "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */,
    "declaration": true,
    "declarationDir": "./dist/types",
    "sourceMap": true,
  }
}