diff --git a/packages/utils/typescript/lib/utils/get-config-path.js b/packages/utils/typescript/lib/utils/get-config-path.js
index c49f0b195a..d0d1105d9a 100644
--- a/packages/utils/typescript/lib/utils/get-config-path.js
+++ b/packages/utils/typescript/lib/utils/get-config-path.js
@@ -13,7 +13,7 @@ const DEFAULT_TS_CONFIG_FILENAME = 'tsconfig.json';
  * @param {string} [options.filename]
  * @param {boolean} [options.ancestorsLookup]
  *
- * @return {string}
+ * @return {string | undefined}
  */
 module.exports = (dir, { filename = DEFAULT_TS_CONFIG_FILENAME, ancestorsLookup = false } = {}) => {
   const dirAbsolutePath = path.resolve(dir);