missing package breaking builds?

Author: deckchairlabs

package.json

@@ -19,6 +19,7 @@
   "devDependencies": {
     "@babel/cli": "^7.4.4",
     "@babel/core": "^7.4.5",
+    "@babel/helper-validator-identifier": "^7.9.0",
     "@babel/plugin-transform-runtime": "^7.7.6",
     "@babel/preset-env": "^7.4.5",
     "@babel/preset-react": "^7.0.0",

yarn.lock

@@ -563,6 +563,11 @@
   dependencies:
     "@babel/types" "^7.8.3"
 
+"@babel/helper-validator-identifier@^7.9.0":
+  version "7.9.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.9.0.tgz#ad53562a7fc29b3b9a91bbf7d10397fd146346ed"
+  integrity sha512-6G8bQKjOh+of4PV/ThDm/rRqlU7+IGoJuofpagU5GlEl29Vv0RGqqt86ZGRV8ZuSOY3o+8yXl5y782SMcG7SHw==
+
 "@babel/helper-wrap-function@^7.7.4":
   version "7.7.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.7.4.tgz#37ab7fed5150e22d9d7266e830072c0cdd8baace"