function genStaticKeys (modules) {
  return modules.reduce(function (keys, m) {
    return keys.concat(m.staticKeys || [])
  }, []).join(',')
}
function genStaticKeys (modules) {
  return modules.reduce(function (keys, m) {
    return keys.concat(m.staticKeys || [])
  }, []).join(',')
}
function genStaticKeys ( modules ) { return modules . reduce ( function ( keys , m ) { return keys . concat ( m . staticKeys || [ ] ) } , [ ] ) . join ( ',' ) }
Generate a static keys string from compiler modules.
Generate a static keys string from compiler modules .
Generate static keys for a list of modules