Use yarn clean instead of postinstall

Author: CompuIves

.yarnclean

@@ -0,0 +1,48 @@
+# test directories
+__tests__
+test
+tests
+powered-test
+
+# asset directories
+docs
+doc
+website
+images
+assets
+
+# examples
+example
+examples
+
+# code coverage directories
+coverage
+.nyc_output
+
+# build scripts
+Makefile
+Gulpfile.js
+Gruntfile.js
+
+# configs
+appveyor.yml
+circle.yml
+codeship-services.yml
+codeship-steps.yml
+wercker.yml
+.tern-project
+.gitattributes
+.editorconfig
+.*ignore
+.eslintrc
+.jshintrc
+.flowconfig
+.documentup.json
+.yarn-metadata.json
+.travis.yml
+
+# misc
+*.md
+
+@types/react-native
+packages/app/node_modules/styled-components

package.json

@@ -33,7 +33,7 @@
     "lint": "lerna run lint --stream",
     "add-contributor": "all-contributors add",
     "generate": "all-contributors generate",
-    "postinstall": "rimraf node_modules/@types/react-native && rimraf packages/app/node_modules/styled-components node_modules/react-split-pane/node_modules/react* && yarn lerna run install-dependencies --scope vscode-textmate --scope codesandbox-browserfs --scope sse-loading-screen --stream && opencollective postinstall",
+    "postinstall": "yarn lerna run install-dependencies --scope vscode-textmate --scope codesandbox-browserfs --scope sse-loading-screen --stream && opencollective postinstall",
     "typecheck": "lerna run typecheck --scope app"
   },
   "workspaces": {