tsconfig.json

{
  "compilerOptions": {
    "target": "ES2019",                                /* 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'. */
    "strict": true,                                 /* Enable all strict type-checking options. */
    "outDir": "dist",
    "baseUrl": ".",                             /* Base directory to resolve non-absolute module names. */                            /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
    "rootDirs": ["src", "tests"],                              /* List of root folders whose combined content represents the structure of the project at runtime. */
    "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. */
    "forceConsistentCasingInFileNames": true        /* Disallow inconsistently-cased references to the same file. */
  },
  "include": ["src","tests"],
  "exclude": ["node_modules"]
}