app,cli/templates: install @types/react-dom in app for @testing-library/react

packages/app/package.json

@@ -38,6 +38,7 @@
     "@types/jest": "^25.2.2",
     "@types/jquery": "^3.3.34",
     "@types/node": "^12.0.0",
+    "@types/react-dom": "^16.9.8",
     "@types/zen-observable": "^0.8.0",
     "cross-env": "^7.0.0",
     "cypress": "^4.2.0",

packages/cli/templates/default-app/packages/app/package.json.hbs

@@ -23,6 +23,7 @@
     "@testing-library/user-event": "^12.0.7",
     "@types/jest": "^25.2.2",
     "@types/node": "^12.0.0",
+    "@types/react-dom": "^16.9.8",
     "cross-env": "^7.0.0",
     "cypress": "^4.2.0",
     "eslint-plugin-cypress": "^2.10.3",

yarn.lock

@@ -3812,6 +3812,13 @@
     "@types/webpack" "*"
     "@types/webpack-dev-server" "*"
 
+"@types/react-dom@^16.9.8":
+  version "16.9.8"
+  resolved "https://registry.npmjs.org/@types/react-dom/-/react-dom-16.9.8.tgz#fe4c1e11dfc67155733dfa6aa65108b4971cb423"
+  integrity sha512-ykkPQ+5nFknnlU6lDd947WbQ6TE3NNzbQAkInC2EKY1qeYdTKp7onFusmYZb+ityzx2YviqT6BXSu+LyWWJwcA==
+  dependencies:
+    "@types/react" "*"
+
 "@types/react-helmet@^5.0.15":
   version "5.0.15"
   resolved "https://registry.npmjs.org/@types/react-helmet/-/react-helmet-5.0.15.tgz#af0370617307e9f062c6aee0f1f5588224ce646e"