Bring back support for React 18

Author: Sebastian Silbermann

package.json

@@ -62,8 +62,8 @@
     "typescript": "^4.1.2"
   },
   "peerDependencies": {
-    "react": "^18.3.0-canary",
-    "react-dom": "^18.3.0-canary"
+    "react": "^18.0.0 || ^18.3.0-canary",
+    "react-dom": "^18.0.0 || ^18.3.0-canary"
   },
   "eslintConfig": {
     "extends": "./node_modules/kcd-scripts/eslint.js",

src/act-compat.js

@@ -1,6 +1,7 @@
 import * as React from 'react'
+import * as DeprecatedReactTestUtils from 'react-dom/test-utils'
 
-const reactAct = React.act
+const reactAct = React.act ?? DeprecatedReactTestUtils.act
 
 function getGlobalThis() {
   /* istanbul ignore else */