how to add flags to a grunt execute task

i am trying to run a node file with grunt.js

for some reasons i am not able to provide the node file with argument.

this is what i want to happend:

node server/index.js -e development-local

and this is my configuration:

   execute: {
      development_target: {
        src: ['index.js'],
        options: {
          args: ['e development-local',]
        }
      }
    }

  grunt.registerTask('serve-local', ['execute:development_target']);

but it is not working for some reason. i tried everything.