<dependency>
  <groupId>org.webjars.npm</groupId>
  <artifactId>xtend</artifactId>
  <version>2.0.6</version>
</dependency>

implementation 'org.webjars.npm:xtend:2.0.6'

implementation("org.webjars.npm:xtend:2.0.6")

libraryDependencies += "org.webjars.npm" % "xtend" % "2.0.6"

@Grapes(
  @Grab(group='org.webjars.npm', module='xtend', version='2.0.6')
)

<dependency org="org.webjars.npm" name="xtend" rev="2.0.6" />

[org.webjars.npm/xtend "2.0.6"]

'org.webjars.npm:xtend:jar:2.0.6'