update travis.yml

.travis.yml

     - PATH=$PATH:$HOME/.yarn/bin
     - ANDROID_HOME=$HOME/android-sdk-macosx
     - PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
-    - YARN_CACHE=$HOME/.yarn-cache
 
 git:
   depth: 10
 
 cache:
   directories:
-    - $YARN_CACHE
+    - $HOME/.yarn-cache
     - $HOME/.gradle/
     - $HOME/.m2
     - $ANDROID_HOME/licenses/
 before_install:
   - brew update
   - brew cask install java
-  - touch ~/.nvmrc
-  - rm -rf ~/.nvm
-  - git clone https://github.com/creationix/nvm.git ~/.nvm
-  - source ~/.nvm/nvm.sh
   - nvm install $NODE_VERSION
   - curl -o- -L https://yarnpkg.com/install.sh | bash
-  - yarn cache dir
 
 install:
   - set -e
-  - ./scripts/clean.sh
   - yarn install
 
 script:

playground/scripts/e2e.ios.js

 
 function e2e() {
   try {
+    shellUtils.exec.execSyncSilent(`watchman watch-del-all || true`);
     shellUtils.exec.kill(`detox-server`);
     shellUtils.exec.exec(`./node_modules/.bin/detox-server > ./detox-server.log 2>&1`);
     const detoxAppBuildPath = `ios/DerivedData/playground/Build/Products/${release ? 'Release' : 'Debug'}_Detox-iphonesimulator/playground.app`;

scripts/clean.sh

-#!/bin/sh -e
-
-watchman watch-del-all 2> /dev/null || true
-rm -rf "$TMPDIR/react-packager-*" || true