tsconfig.json

{
  "include": ["./src"],
  "compilerOptions": {
    /* Language and Environment */
    "target": "ESNext",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */

    /* Modules */
    "module": "CommonJS",                                /* Specify what module code is generated. */
    "rootDir": "./src",                                  /* Specify the root folder within your source files. */
    "moduleResolution": "node",                       /* Specify how TypeScript looks up a file from a given module specifier. */
    "baseUrl": "./src",                                  /* Specify the base directory to resolve non-relative module names. */

    /* Emit */
    "sourceMap": true,
    "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
    "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
    "outDir": "./dist/cjs",                                   /* Specify an output folder for all emitted files. */
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */

    /* Type Checking */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
  }
}