Use Mojang's Brigadier to create commands for your plugins.
Groovy:
repositories {
maven {
url = 'https://jitpack.io'
}
}
dependencies {
implementation 'com.github.Musician101:Bukkitier:[version]'
}
Kotlin DSL
repositories {
maven("https://jitpack.io")
}
dependencies {
api("com.github.Musician101:Bukkitier:[version]")
}