I vaguely remember there being a way to assign to a Property Gradle Community #community-support

I vaguely remember there being a way to assign to ...

Martmists

11/30/2025, 4:27 PM

I vaguely remember there being a way to assign to a Property<String> with = in kotlin build scripts, but now can't find anything about that and gradle seems to be rejecting it with

[ASSIGNMENT_TYPE_MISMATCH] Assignment type mismatch: actual type is 'String', but 'Property<String>' was expected.

Is prop.set the only way to do this in current gradle versions?

ephemient

11/30/2025, 5:02 PM

it should just work in

*.gradle.kts

, or at least I don't see how you could end up in a situation where it doesn't work…

ephemient

11/30/2025, 5:02 PM

if you're writing a binary plugin, apply the

kotlin-dsl

plugin which enables the script-like syntax, or manually configure

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plugins {
    id("org.jetbrains.kotlin.plugin.assignment")
}

assignment {
    annotation("org.gradle.api.SupportsKotlinAssignmentOverloading")
}

and

import org.gradle.kotlin.dsl.assign

in your

.kt

source file

Martmists

11/30/2025, 5:02 PM

I figured it out, the fields had to be abstract instead of initialized with project.objects.propertyT()

ephemient

11/30/2025, 5:03 PM

on a

val

ephemient

11/30/2025, 5:08 PM

sounds like you may have been hitting an explicitly unsupported case https://github.com/gradle/KEEP/blob/assign-operator/proposals/assign-operator-overload.md

Assign operator overload should NOT work for var properties/variables. Setter resolution logic should always have a priority even if type doesn’t match.

ephemient

11/30/2025, 5:15 PM

also for future reference

org.gradle.kotlin.kotlin-dsl.compiler-settings

also applies

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plugins {
    id("org.jetbrains.kotlin.plugin.sam.with.receiver")
}
samWithReceiver {
    annotation("org.gradle.api.HasImplicitReceiver")
}

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