fix: enable declaration file generation in tsconfig

Author: yaroslav8765

tsconfig.json

@@ -2,6 +2,7 @@
   "compilerOptions": {
     "target": "es2016",                                  /* Set the JavaScript language version for emitted JavaScript and include*/ 
     "module": "node16",                                /* Specify what module code is generated. */
+    "declaration": true,
     "outDir": "./dist",                                   /* Specify an output folder for all emitted files. */
     "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules.  */
     "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */