Add preact as devDependencies

packages/preact-emotion/package.json

@@ -25,6 +25,7 @@
   "devDependencies": {
     "emotion": "^9.1.3",
     "npm-run-all": "^4.0.2",
+    "preact": "^8.2.9",
     "react-emotion": "^9.1.3",
     "rimraf": "^2.6.1",
     "rollup": "^0.51.3"

yarn.lock

@@ -3825,6 +3825,14 @@ create-hmac@^1.1.0, create-hmac@^1.1.2, create-hmac@^1.1.4:
     safe-buffer "^5.0.1"
     sha.js "^2.4.8"
 
+create-react-class@^15.6.0:
+  version "15.6.3"
+  resolved "https://registry.yarnpkg.com/create-react-class/-/create-react-class-15.6.3.tgz#2d73237fb3f970ae6ebe011a9e66f46dbca80036"
+  dependencies:
+    fbjs "^0.8.9"
+    loose-envify "^1.3.1"
+    object-assign "^4.1.1"
+
 cross-env@^3.1.1:
   version "3.2.4"
   resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-3.2.4.tgz#9e0585f277864ed421ce756f81a980ff0d698aba"
@@ -11305,6 +11313,10 @@ potrace@^2.1.1:
   dependencies:
     jimp "^0.2.24"
 
+preact@^8.2.9:
+  version "8.2.9"
+  resolved "https://registry.yarnpkg.com/preact/-/preact-8.2.9.tgz#813ba9dd45e5d97c5ea0d6c86d375b3be711cc40"
+
 prebuild-install@^2.5.3:
   version "2.5.3"
   resolved "https://registry.yarnpkg.com/prebuild-install/-/prebuild-install-2.5.3.tgz#9f65f242782d370296353710e9bc843490c19f69"
@@ -11681,7 +11693,16 @@ react-dev-utils@^4.2.1:
     strip-ansi "3.0.1"
     text-table "0.2.0"
 
-react-dom@^15.6.0, react-dom@^16.0.0, react-dom@^16.2.0:
+react-dom@^15.6.0:
+  version "15.6.2"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-15.6.2.tgz#41cfadf693b757faf2708443a1d1fd5a02bef730"
+  dependencies:
+    fbjs "^0.8.9"
+    loose-envify "^1.1.0"
+    object-assign "^4.1.0"
+    prop-types "^15.5.10"
+
+react-dom@^16.0.0, react-dom@^16.2.0:
   version "16.4.0"
   resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.0.tgz#099f067dd5827ce36a29eaf9a6cdc7cbf6216b1e"
   dependencies:
@@ -11802,7 +11823,17 @@ react-test-renderer@^16.0.0-0, react-test-renderer@^16.2.0:
     prop-types "^15.6.0"
     react-is "^16.4.0"
 
-react@^15.6.0, react@^16.0.0, react@^16.2.0:
+react@^15.6.0:
+  version "15.6.2"
+  resolved "https://registry.yarnpkg.com/react/-/react-15.6.2.tgz#dba0434ab439cfe82f108f0f511663908179aa72"
+  dependencies:
+    create-react-class "^15.6.0"
+    fbjs "^0.8.9"
+    loose-envify "^1.1.0"
+    object-assign "^4.1.0"
+    prop-types "^15.5.10"
+
+react@^16.0.0, react@^16.2.0:
   version "16.4.0"
   resolved "https://registry.yarnpkg.com/react/-/react-16.4.0.tgz#402c2db83335336fba1962c08b98c6272617d585"
   dependencies: