tsconfig.json

{
  "compilerOptions": {
    "target": "es6" /* 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": [
      "es2018",
      "dom"
    ] /* Specify library files to be included in the compilation. */,
    "outDir": "./dist/" /* Redirect output structure to the directory. */,
    "strictNullChecks": false /* Enable strict null checks. */,
    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
    "skipLibCheck": true /* Skip type checking of declaration files. */,
    "resolveJsonModule": true,
    "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
  },
  "include": ["**/*.ts"],
  "exclude": ["node_modules", "**/*.spec.ts"]
}