WebJar for extend
'org.webjars.npm:extend:1.2.1'
<dependency> <groupId>org.webjars.npm</groupId> <artifactId>extend</artifactId> <version>1.2.1</version> </dependency>
<dependency org="org.webjars.npm" name="extend" rev="1.2.1"/>
"org.webjars.npm", "extend", "1.2.1"