tsconfig.json

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "declaration": true,            /* Concatenate & emit output to single file.*/
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
    "declarationMap": true,
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
    "incremental": true,            /* Enable incremental compilation */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "skipLibCheck": true,                                 /* Skip type checking all .d.ts files. */
    "lib": ["ES6", "DOM"],
    "target": "es2020",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "module": "commonjs",                                /* Specify what module code is generated. */
    
    "outDir": "./lib/esm",
    "declarationDir": "./lib/esm/types"
  },
  "include": [
    "src"
  ]
}