Added index signature

index.d.ts

@@ -2,4 +2,6 @@ export class Config {
     constructor(basePath?: string, envPrefix?: string);
     _reload(): void;
     _show(): any;
+    // Index signature
+    [key: string]: any;
 }
\ No newline at end of file

package.json

 {
   "name": "@libs/config",
-  "version": "1.13.2",
+  "version": "1.13.3",
   "description": "Simple Config with ENV Support",
   "main": "index.js",
   "scripts": {
@@ -17,11 +17,11 @@
     "lodash.merge": "^4.6.2"
   },
   "devDependencies": {
-    "@stryker-mutator/core": "^7.1.0",
+    "@stryker-mutator/core": "^8.2.6",
     "@stryker-mutator/javascript-mutator": "^4.0.0",
-    "@stryker-mutator/jest-runner": "^7.1.0",
+    "@stryker-mutator/jest-runner": "^8.2.6",
     "@stryker-mutator/typescript": "^4.0.0",
-    "jest": "^29.5.0"
+    "jest": "^29.7.0"
   },
   "publishConfig": {
     "@libs:registry": "https://gitlab.ard.de/api/v4/projects/919/packages/npm/"