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If I get it directly via

extension.getByType(PlayPublisherExtension)

,

register

method doesn't exist

It's a

NamedDomainObjectContainer<PlayPublisherExtension>

, you'll have to get it by name. See https://github.com/Triple-T/gradle-play-publisher/blob/77b069708cfd1bedfce5424af2c4a92cc9439763/testapp/build.gradle.kts#L97 for an example.

Wops, I didn't know I can do

configure<NamedDomainObjectContainer<PlayPublisherExtension>>

, thank you!

That's a

kotlin-dsl

extension for `configure(TypeOf,Action)`: https://docs.gradle.org/current/javadoc/org/gradle/api/plugins/ExtensionContainer.html#configure-org.gradle.api.refl[…]TypeOf-org.gradle.api.Action-