tsconfig.json

{
  "compilerOptions": {
    "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */,
    "module": "commonjs" /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
    "declaration": true /* Generates corresponding '.d.ts' file. */,
    "outDir": "./dist" /* Redirect output structure to the directory. */,
    "removeComments": true /* Do not emit comments to output. */,
    "strict": true /* Enable all strict type-checking options. */,
    "noImplicitAny": false /* Raise error on expressions and declarations with an implied 'any' type. */,
    "noUnusedLocals": true /* Report errors on unused locals. */,
    "noUnusedParameters": true /* Report errors on unused parameters. */,
    "lib": ["es2017", "dom"],
    "esModuleInterop": true
  },
  "include": ["src/**/*.ts"],
  "exclude": ["node_modules", "src/**/*.test.ts"]
}