Actually it changes the build description not build name, so the post title can be confusing. Resolution is currentBuild.displayName

We will update the article with the changes.

What is the equivalent for this in a declarative pipeline?

Hernán

In declarative you must use the script { ... } block.

pipeline {
    stages {
        stage("Build"){
            steps {
                script {
                    currentBuild.displayName = "The name."
                    currentBuild.description = "The best description."
                }
                ... do whatever.
            }
        }
    }
}

@Hernan & @Allan that does not work in declarative pipeline.

I also tried

pipeline {
    stages {
        stage("Build"){
            steps {
                script {
                    env.currentBuild.displayName = "The name."
                    env.currentBuild.description = "The best description."
                }
                ... do whatever.
            }
        }
    }
}

But it throws NullPointerException error as shown below

java.lang.NullPointerException: Cannot set property 'displayname' on null object
	at org.codehaus.groovy.runtime.NullObject.setProperty(NullObject.java:80)
	at org.codehaus.groovy.runtime.InvokerHelper.setProperty(InvokerHelper.java:197)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.setProperty(ScriptBytecodeAdapter.java:484)
	at org.kohsuke.groovy.sandbox.impl.Checker$7.call(Checker.java:347)

@Badal My script is missing the `agent` directive, the following should work as is:

pipeline {
    agent any
    stages {
        stage("Build"){
            steps {
                script {
                    currentBuild.displayName = "The name."
                    currentBuild.description = "The best description."
                }
            }
        }
    }
}

If it does not, please file a support request so that we can troubleshoot this further.

Note: currentBuild is a Groovy variable, not an environment variable. So you cannot use env.