tsconfig.json

{
    "compilerOptions": {
      "target": "es2017" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */,
      "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
      "lib": ["ES2015"],
      "allowJs": false /* Allow javascript files to be compiled. */,
      "declaration": true /* Generates corresponding '.d.ts' file. */,
      "sourceMap": false /* Generates corresponding '.map' file. */,
      "outDir": "./dist" /* Redirect output structure to the directory. */,
      "strict": true /* Enable all strict type-checking options. */,
      "noUnusedParameters": true /* Report errors on unused parameters. */,
      "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
      "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
      "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
      "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
      "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */,
      "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */,
      "resolveJsonModule": true
    },
    "exclude": ["dist", "node_modules", "./test/**.ts"],
    "include": ["./src/index.ts", "./types"]
  }