<dependency>
  <groupId>org.webjars.npm</groupId>
  <artifactId>acorn</artifactId>
  <version>5.5.1</version>
</dependency>

implementation 'org.webjars.npm:acorn:5.5.1'

implementation("org.webjars.npm:acorn:5.5.1")

libraryDependencies += "org.webjars.npm" % "acorn" % "5.5.1"

@Grapes(
  @Grab(group='org.webjars.npm', module='acorn', version='5.5.1')
)

<dependency org="org.webjars.npm" name="acorn" rev="5.5.1" />

[org.webjars.npm/acorn "5.5.1"]

'org.webjars.npm:acorn:jar:5.5.1'