How to run multiple stages on the same node with declarative Jenkins pipeline?

Question

Goal
Run multiple stages of a declarative Jenkins pipeline on the same node.

Setup
This is just a minimal example to show the p

Answer 1

You could define stages inside a script block. Those stages are kind of sub-stages of a parent stage running in a given agent. That was the approach that I had to use in a similar use case than yours.

#!groovy

windowsNode = 'windows'

pipeline {
  agent none
  stages {
    stage('Stage A') {
      agent {
        label windowsNode
      }
      steps {
        script {

          stage('Stage 1') {        
            windowsNode = NODE_NAME
            echo "windowsNode: $windowsNode, NODE_NAME: $NODE_NAME"
          }

          stage('Stage 2') {
            echo "windowsNode: $windowsNode, NODE_NAME: $NODE_NAME"
          }
        }
      }
    }
  }
}