idea/src/META-INF/decompiler.xml

<idea-plugin>
    <extensions defaultExtensionNs="com.intellij">
        <applicationService serviceInterface="org.jetbrains.kotlin.idea.internal.KotlinDecompilerService"
                            serviceImplementation="org.jetbrains.kotlin.idea.internal.KotlinDecompilerServiceImpl"/>
        <writingAccessProvider implementation="org.jetbrains.kotlin.idea.internal.DecompiledFileWritingAccessProvider"/>
    </extensions>
</idea-plugin>