feat: Move @testing-library/dom and @types/react-dom to peer dependencies (#1305)

BREAKING CHANGE: `@testing-library/dom` was moved to a peer dependency and needs to be explicitly installed. This reduces the chance of having conflicting versions of `@testing-library/dom` installed that frequently caused bugs when used with `@testing-library/user-event`. We will also be able to allow new versions of `@testing-library/dom` being used without a SemVer major release of `@testing-library/react` by just widening the peer dependency.
`@types/react-dom` needs to be installed if you're typechecking files using `@testing-library/react`.

Co-authored-by: Matan Borenkraout <matanbobi@gmail.com>

Author: eps1lon

README.md

@@ -97,21 +97,24 @@ primary guiding principle is:
 ## Installation
 
 This module is distributed via [npm][npm] which is bundled with [node][node] and
-should be installed as one of your project's `devDependencies`:
+should be installed as one of your project's `devDependencies`.  
+Starting from RTL version 16, you'll also need to install
+`@testing-library/dom`:
 
 ```
-npm install --save-dev @testing-library/react
+npm install --save-dev @testing-library/react @testing-library/dom
 ```
 
 or
 
 for installation via [yarn][yarn]
 
 ```
-yarn add --dev @testing-library/react
+yarn add --dev @testing-library/react @testing-library/dom
 ```
 
-This library has `peerDependencies` listings for `react` and `react-dom`.
+This library has `peerDependencies` listings for `react`, `react-dom` and
+starting from RTL version 16 also `@testing-library/dom`.
 
 _React Testing Library versions 13+ require React v18. If your project uses an
 older version of React, be sure to install version 12:_

package.json

@@ -45,13 +45,13 @@
   "author": "Kent C. Dodds <me@kentcdodds.com> (https://kentcdodds.com)",
   "license": "MIT",
   "dependencies": {
-    "@babel/runtime": "^7.12.5",
-    "@testing-library/dom": "^10.0.0",
-    "@types/react-dom": "^18.0.0"
+    "@babel/runtime": "^7.12.5"
   },
   "devDependencies": {
+    "@testing-library/dom": "^10.0.0",
     "@testing-library/jest-dom": "^5.11.6",
     "@types/react": "^18.3.1",
+    "@types/react-dom": "^18.3.0",
     "chalk": "^4.1.2",
     "dotenv-cli": "^4.0.0",
     "jest-diff": "^29.7.0",
@@ -63,13 +63,18 @@
     "typescript": "^4.1.2"
   },
   "peerDependencies": {
+    "@testing-library/dom": "^10.0.0",
     "@types/react": "^18.0.0",
+    "@types/react-dom": "^18.0.0",
     "react": "^18.0.0",
     "react-dom": "^18.0.0"
   },
   "peerDependenciesMeta": {
     "@types/react": {
       "optional": true
+    },
+    "@types/react-dom": {
+      "optional": true
     }
   },
   "eslintConfig": {