tsconfig.esm.json

{
  "compilerOptions": {
    "target": "es5" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "module": "esnext" /* 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. */,
    "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "declarationDir": "./dist/types" /* Specify the output directory for generated declaration files. */,
    "outDir": "./dist/esm" /* Specify an output folder for all emitted files. */,
    "removeComments": true /* Disable emitting comments. */,
    "strict": false /* Enable all strict type-checking options. */,
    "noImplicitAny": true /* Enable error reporting for expressions and declarations with an implied 'any' type. */
  },
  "files": ["./src/index.ts"],
  "include": ["./src/**/*"],
  "exclude": ["./node_modules"]
}