jenkins - How do I get/set property on loaded scripts in Jenkinsfile -

i have jenkinsfile load external files, not know how manage fields on it:

main script:

node {     deletedir()     git credentialsid: 'git-credentials', url: 'git@git-hostname:project/ci-cd.git'     load 'pipeline.groovy' }() 

pipeline.groovy:

def pipe = load 'pipeline-utils.groovy'  pipe.deployat << env.branch_name echo "foo -> ${pipe.deployat}"  { ->     echo 'hello there'     pipe.deploy() } 

pipeline-utils.groovy:

def deployat = []  def deploy() {     echo 'do it' }  

it says groovy.lang.missingpropertyexception: no such property: deployat class: groovy.lang.binding, if echo ${pipe.class} says script2, , if remove deployat lines says do it expected. not right, if can call methods why can not access fields?

my jenkins version 2.19.1.