Objective is to have certain methods which are recursive even among the shared lib files to be kept inside tools class. and call them onto the shared lib files.

Jenkinsfile:

@Library('shared-library') _

pipeline {
agent any
parameters {
choice(name: 'CHOICES', choices: ['one', 'two', 'three'], description: '')
booleanParam(name: 'DEBUG_BUILD', defaultValue: false, description: '')
}
stages {
stage("Test") {
steps {
script {
command label: 'running sleep', 'sleep 10'
}
}
post {
always {
cleanWs()
}
}
}
}
}

Shared lib file: command.groovy

#!/usr/bin/env groovy

import tools
t = new tools()

def call(Map args = [:], String script) {
script = "${args.sudo ? 'sudo ' : ''}${script}"
def label = args.label ?: script
sh label: label, script: script

t.printHello("Gourav")

}

Utility groovy class:

class tools {
def printHello(arg) {
echo "${arg}"
}
}