Clean up dependencies

- Remove `wait-on` as devDep
- Added `importHelpers: true` in `tsconfig.json` as part of `tslib`
- Remove `node-fetch` as dependency

package.json

@@ -52,7 +52,6 @@
     "moment": "^2.24.0",
     "ngx-markdown": "^12.0.1",
     "ngx-mat-select-search": "^3.3.3",
-    "node-fetch": "^2.6.8",
     "rxjs": "6.6.7",
     "tslib": "^2.0.0",
     "uuid": "7.0.3",
@@ -95,7 +94,6 @@
     "ts-node": "^10.9.2",
     "tslint": "~6.1.0",
     "tslint-config-prettier": "^1.18.0",
-    "typescript": "4.3.5",
-    "wait-on": "3.3.0"
+    "typescript": "4.3.5"
   }
 }

tsconfig.json

@@ -7,6 +7,7 @@
     "outDir": "./dist/out-tsc",
     "sourceMap": true,
     "declaration": false,
+    "importHelpers": true,
     "moduleResolution": "node",
     "experimentalDecorators": true,
     "target": "es2015",