npm prune does not fully support npm shrinkwrap

lib/dependencies.sh

@@ -13,8 +13,6 @@ install_node_modules() {
   if [ -e $build_dir/package.json ]; then
     cd $build_dir
 
-    echo "Pruning any extraneous modules"
-    npm prune --unsafe-perm --userconfig $build_dir/.npmrc 2>&1
     if [ -e $build_dir/npm-shrinkwrap.json ]; then
       echo "Installing node modules (package.json + shrinkwrap)"
     else

test/run

@@ -214,7 +214,6 @@ testModulesCheckedIn() {
   assertCaptured "(preinstall script)"
   assertCaptured "Installing any new modules"
   assertCaptured "(postinstall script)"
-  assertNotCaptured "Pruning any extraneous modules"
   assertCapturedSuccess
 }