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[zml2008]

Thanks!

To answer the question I asked myself, here are some other options that could have been used. It seems that gradle as a format name does produce the best results though.

Groovy

plugins {
    java
    id("org.spongepowered.gradle.vanilla") version "0.1"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

minecraft {
    version("21w03a")
    runs {
        server()
        client()
    }
}

Kotlin

plugins {
    java
    id("org.spongepowered.gradle.vanilla") version "0.1"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

minecraft {
    version("21w03a")
    runs {
        server()
        client()
    }
}