tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es2015" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,

    /* Modules */
    "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. */,

    /* Emit */
    "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "emitDeclarationOnly": true /* Only output d.ts files and not JavaScript files. */,
    "outDir": "./types" /* Specify an output folder for all emitted files. */,

    /* Interop Constraints */
    "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. */,

    /* Completeness */
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  },
  "include": ["src"],
  "exclude": ["node_modules"]
}