Restore Policy as a deprecated class

api-tests/build.gradle.kts

@@ -27,7 +27,6 @@
 import io.spine.dependency.lib.Protobuf
 
 plugins {
-    module
     protobuf
     prototap
     `test-module`

api/src/main/kotlin/io/spine/tools/compiler/plugin/Policy.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2025, TeamDev. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Redistribution and use in source and/or binary forms, with or without
+ * modification, must retain the above copyright notice and the following
+ * disclaimer.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package io.spine.tools.compiler.plugin
+
+import io.spine.base.EventMessage
+
+/**
+ * Provided for backward compatibility during migration to [Reaction].
+ */
+@Deprecated("Use `Reaction` instead.", ReplaceWith("Reaction"))
+public abstract class Policy<E : EventMessage> : Reaction<E>()

api/src/main/kotlin/io/spine/tools/compiler/plugin/Reaction.kt

@@ -58,23 +58,23 @@ import io.spine.tools.compiler.type.TypeSystem
  * }
  * ```
  *
- * Please note that when reacting on Protobuf Compiler events, one should mark them as
+ * Note that when reacting on Protobuf Compiler events, one should mark them as
  * [@External][io.spine.core.External]. See the whole list of Protobuf compiler events
  * in `spine/compiler/events.proto`.
  *
  * One reaction only accepts one kind of events. Declaring multiple methods with
  * the [@React][io.spine.server.event.React] annotation causes a runtime error.
  *
- * The `whenever` method accepts a single event and produces an `Iterable` of events. In case if
- * you need to return a single event, use [Just][io.spine.server.event.Just].
+ * The `whenever` method accepts a single event and produces an `Iterable` of events.
+ * If you need to return a single event, use [Just][io.spine.server.event.Just].
  *
- * If there are a few events, see the descendants of [Tuple][io.spine.server.tuple.Tuple].
+ * To return a few events, see the descendants of [Tuple][io.spine.server.tuple.Tuple].
  *
  * If there can be a few alternative events, see the descendants of
  * [Either][io.spine.server.tuple.Either].
  *
- * In case if one of the options does nothing at all, please use [io.spine.server.event.NoReaction]
- * as one of the event types.
+ * If one of the options does nothing at all, use [io.spine.server.event.NoReaction]
+ * as the event type.
  *
  * Finally, if there are multiple events of the same type, use a typed list,
  * e.g. `List<SomethingHappened>`.

buildSrc/src/main/kotlin/module.gradle.kts

@@ -30,10 +30,10 @@ import io.spine.dependency.build.Ksp
 import io.spine.dependency.lib.Jackson
 import io.spine.dependency.lib.Protobuf
 import io.spine.dependency.local.Base
-import io.spine.dependency.local.CoreJava
 import io.spine.dependency.local.CoreJvm
 import io.spine.dependency.local.ToolBase
 import io.spine.dependency.local.Validation
+import io.spine.gradle.github.pages.updateGitHubPages
 import io.spine.gradle.javac.configureErrorProne
 import io.spine.gradle.javac.configureJavac
 import io.spine.gradle.javadoc.JavadocConfig
@@ -72,6 +72,7 @@ project.run {
 
     afterEvaluate {
         configureTaskDependencies()
+        setupDocPublishing()
     }
 }
 
@@ -140,3 +141,16 @@ fun Module.configureKotlin() {
         }
     }
 }
+
+/**
+ * Configures documentation publishing for this subproject.
+ */
+fun Module.setupDocPublishing() {
+    updateGitHubPages {
+        rootFolder.set(rootDir)
+    }
+
+    tasks.named("publish") {
+        dependsOn("${project.path}:updateGitHubPages")
+    }
+}