Jenkins: Can comments be added to a Jenkinsfile?

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Are comments possible in a Jenkinsfile? If so, what’s the syntax?

I am using the declarative pipeline syntax.

I want to comment out the “post” section below until my SMTP server is working.

pipeline {

  agent { label 'docker-build-slave' }

  environment {
    IMAGE = 'registry.gitlab.com/XXXXX/bible-server'
    DOCKER_REGISTRY_CREDENTIALS = credentials('DOCKER_REGISTRY_CREDENTIALS')
  }

  options {
    timeout(10)
  }

  stages {

    stage('Test') {
      steps {
        sh 'yarn'
        sh 'npm test'
      }
    }

    stage('Build') {
      when {
        branch '*/master'
      }
      steps {
        sh 'docker login -u ${DOCKER_REGISTRY_CREDENTIALS_USR} -p ${DOCKER_REGISTRY_CREDENTIALS_PSW} registry.gitlab.com'
        sh 'docker build -t ${IMAGE}:${BRANCH_NAME} .'
        sh 'docker push ${IMAGE}:${BRANCH_NAME}'
      }
    }

    stage('Deploy') {
      when {
        branch '*/master'
      }
      steps {
        echo 'Deploying ..'
      }
    }
  }

  post {
    success {
      mail to: "XXXXX@gmail.com", subject:"SUCCESS: ${currentBuild.fullDisplayName}", body: "Yay, we passed."
    }
    failure {
      mail to: "XXXXX@gmail.com", subject:"FAILURE: ${currentBuild.fullDisplayName}", body: "Boo, we failed."
    }
  }
}

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