tsconfig.json

{
    "compilerOptions": {
        "target": "ESNext",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
        "module": "ESNext",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
        "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
        "strict": true,                           /* Enable all strict type-checking options. */
        "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
        // Disallow inconsistently-cased references to the same file
        "forceConsistentCasingInFileNames": true,
        "moduleResolution": "Node",
        // Disable emitting files
        "noEmit": true,
    },
    "files": ["src/index.ts", "tests/lib.test.ts"],
}