Difficulty moving Gradle configuration to an external script - kotlin

Question

I am trying to move some parts of my Gradle build script to an external configuration file that can be shared among projects. Here is an example with the Detekt plugin:
Current Code
build.gradle.kts (condensed to only the relevant parts)
plugins{
id("io.gitlab.arturbosch.detekt").version("1.19.0-RC1")
}
...
detekt{
...
}
What I'm trying to do
build.gradle.kts
apply(File("common.gradle.kts"))
common.gradle.kts
plugins {
id("io.gitlab.arturbosch.detekt").version("1.19.0-RC1")
}
detekt{
...
}
but when I do this I get this error:
<my_project>\common.gradle.kts:7:1: Unresolved reference: detekt
So the plugin section doesn't appear to be doing anything. And just to be clear, this plugin does not need anything in dependencies section, it works fine inside build.gradle.kts with only the plugin declaration.
Why doesn't this work?

Answer 1

I am using it with normal Groovy Gradle scripts like this:
# detekt.gradle
apply plugin: 'io.gitlab.arturbosch.detekt'
tasks.detekt.jvmTarget = "1.8"
detekt {
buildUponDefaultConfig = true
input = files("${rootProject.projectDir}/app/src")
config = files("${rootProject.projectDir}/detekt.yml")
reports {
html.enabled = true
xml.enabled = true
}
}
# build.gradle
buildscript {
repositories {
google()
mavenCentral()
}
dependencies {
classpath libs.android.gradle
classpath libs.kotlin.gradle
classpath libs.detekt
}
}
allprojects {
repositories {
google()
mavenCentral()
}
}
subprojects {
apply from: rootProject.file('detekt.gradle')
apply from: rootProject.file('ktlint.gradle')
apply from: rootProject.file('spotless.gradle')
...
}