[IMP] pin prettier version to ensure consistent results

package.json

@@ -49,7 +49,7 @@
     "jest-environment-jsdom": "^27.1.0",
     "live-server": "^1.2.1",
     "npm-run-all": "^4.1.5",
-    "prettier": "^2.0.4",
+    "prettier": "2.4.1",
     "rollup": "^2.56.3",
     "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-typescript2": "^0.30.0",
@@ -65,7 +65,9 @@
       "<rootDir>/src",
       "<rootDir>/tests"
     ],
-    "setupFiles": ["./tests/mocks/mockEventTarget.js"],
+    "setupFiles": [
+      "./tests/mocks/mockEventTarget.js"
+    ],
     "transform": {
       "^.+\\.ts?$": "ts-jest"
     },