fix incompatibility with ts 3

package.json

@@ -37,9 +37,10 @@
     "@types/cordova": "0.0.34",
     "@types/jest": "^24.0.18",
     "@types/node": "^12.7.5",
+    "@types/prettier": "<2.6.0",
     "codecov": "^3.8.3",
     "eslint": "^8.0.0",
-    "jest": "^25.5.4",
+    "jest": "^26.1.0",
     "json-schema": "^0.4.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^3.3.3",
@@ -54,6 +55,7 @@
     "ts-jest": "^25.0.0",
     "typescript": "^3.6.3"
   },
+  "_devDependencies_notes": "@types/prettier required in order to keep compatibility with older typescript.",
   "scripts": {
     "build:bundle": "rollup --config",
     "build:typescript": "tsc -p tsconfig.build.json",