<dependency>
  <groupId>org.webjars.npm</groupId>
  <artifactId>ng2-tree</artifactId>
  <version>2.0.0-alpha.8</version>
</dependency>

implementation 'org.webjars.npm:ng2-tree:2.0.0-alpha.8'

implementation("org.webjars.npm:ng2-tree:2.0.0-alpha.8")

libraryDependencies += "org.webjars.npm" % "ng2-tree" % "2.0.0-alpha.8"

@Grapes(
  @Grab(group='org.webjars.npm', module='ng2-tree', version='2.0.0-alpha.8')
)

<dependency org="org.webjars.npm" name="ng2-tree" rev="2.0.0-alpha.8" />

[org.webjars.npm/ng2-tree "2.0.0-alpha.8"]

'org.webjars.npm:ng2-tree:jar:2.0.0-alpha.8'