Refactor code structure for improved readability and maintainability

node_modules/.bin/rollup

@@ -1 +1,16 @@
-../rollup/dist/bin/rollup
+#!/bin/sh
+basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
+
+case `uname` in
+    *CYGWIN*|*MINGW*|*MSYS*)
+        if command -v cygpath > /dev/null 2>&1; then
+            basedir=`cygpath -w "$basedir"`
+        fi
+    ;;
+esac
+
+if [ -x "$basedir/node" ]; then
+  exec "$basedir/node"  "$basedir/../rollup/dist/bin/rollup" "$@"
+else 
+  exec node  "$basedir/../rollup/dist/bin/rollup" "$@"
+fi