fix(swagger): avoid join error issue by return default string value w…

…hen import.meta.dirname isn't available

fix issue with jest

packages/specs/swagger/src/constants.ts

@@ -1,5 +1,6 @@
+import {getValue} from "@tsed/core";
 import {join} from "path";
 import getAbsoluteFSPath from "swagger-ui-dist/absolute-path.js";
 
 export const SWAGGER_UI_DIST = getAbsoluteFSPath();
-export const ROOT_DIR = join(import.meta.dirname, "..");
+export const ROOT_DIR = join(getValue(import.meta, "dirname", ""), "..");