Update to Hilt 2.48.1 and use the KSP version

* Moved protobuf to separate module to avoid having to wire KSP's Plugin with the Protobuf Plugin.
* `@Binds` function cannot be an extension function.
* Commented `kotlin.compiler.execution.strategy=in-process` in CI to circumvent OOMs due to increased metaspace usage.

.github/ci-gradle.properties

@@ -19,7 +19,6 @@ org.gradle.parallel=true
 org.gradle.workers.max=2
 
 kotlin.incremental=false
-kotlin.compiler.execution.strategy=in-process
 
 # Controls KotlinOptions.allWarningsAsErrors.
 # This value used in CI and is currently set to false.

app/build.gradle.kts

@@ -130,6 +130,6 @@ dependencies {
     testImplementation(libs.accompanist.testharness)
     testImplementation(libs.work.testing)
     testImplementation(kotlin("test"))
-    kaptTest(libs.hilt.compiler)
+    kspTest(libs.hilt.compiler)
 
 }

build-logic/convention/src/main/kotlin/AndroidHiltConventionPlugin.kt

@@ -23,17 +23,15 @@ class AndroidHiltConventionPlugin : Plugin<Project> {
     override fun apply(target: Project) {
         with(target) {
             with(pluginManager) {
+                apply("com.google.devtools.ksp")
                 apply("dagger.hilt.android.plugin")
-                // KAPT must go last to avoid build warnings.
-                // See: https://stackoverflow.com/questions/70550883/warning-the-following-options-were-not-recognized-by-any-processor-dagger-f
-                apply("org.jetbrains.kotlin.kapt")
             }
 
             dependencies {
                 "implementation"(libs.findLibrary("hilt.android").get())
-                "kapt"(libs.findLibrary("hilt.compiler").get())
+                "ksp"(libs.findLibrary("hilt.compiler").get())
-                "kaptAndroidTest"(libs.findLibrary("hilt.compiler").get())
+                "kspAndroidTest"(libs.findLibrary("hilt.compiler").get())
-                "kaptTest"(libs.findLibrary("hilt.compiler").get())
+                "kspTest"(libs.findLibrary("hilt.compiler").get())
             }
 
         }

core/datastore-proto/build.gradle.kts

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    alias(libs.plugins.nowinandroid.android.library)
+    alias(libs.plugins.protobuf)
+}
+
+android {
+    namespace = "com.google.samples.apps.nowinandroid.core.datastore.proto"
+}
+
+// Setup protobuf configuration, generating lite Java and Kotlin classes
+protobuf {
+    protoc {
+        artifact = libs.protobuf.protoc.get().toString()
+    }
+    generateProtoTasks {
+        all().forEach { task ->
+            task.builtins {
+                register("java") {
+                    option("lite")
+                }
+                register("kotlin") {
+                    option("lite")
+                }
+            }
+        }
+    }
+}
+
+androidComponents.beforeVariants {
+    android.sourceSets.register(it.name) {
+        val buildDir = layout.buildDirectory.get().asFile
+        java.srcDir(buildDir.resolve("generated/source/proto/${it.name}/java"))
+        kotlin.srcDir(buildDir.resolve("generated/source/proto/${it.name}/kotlin"))
+    }
+}
+
+dependencies {
+    implementation(libs.protobuf.kotlin.lite)
+}

core/datastore/build.gradle.kts

@@ -18,7 +18,6 @@ plugins {
     alias(libs.plugins.nowinandroid.android.library)
     alias(libs.plugins.nowinandroid.android.library.jacoco)
     alias(libs.plugins.nowinandroid.android.hilt)
-    alias(libs.plugins.protobuf)
 }
 
 android {
@@ -33,34 +32,8 @@ android {
     }
 }
 
-// Setup protobuf configuration, generating lite Java and Kotlin classes
-protobuf {
-    protoc {
-        artifact = libs.protobuf.protoc.get().toString()
-    }
-    generateProtoTasks {
-        all().forEach { task ->
-            task.builtins {
-                register("java") {
-                    option("lite")
-                }
-                register("kotlin") {
-                    option("lite")
-                }
-            }
-        }
-    }
-}
-
-androidComponents.beforeVariants {
-    android.sourceSets.register(it.name) {
-        val buildDir = layout.buildDirectory.get().asFile
-        java.srcDir(buildDir.resolve("generated/source/proto/${it.name}/java"))
-        kotlin.srcDir(buildDir.resolve("generated/source/proto/${it.name}/kotlin"))
-    }
-}
-
 dependencies {
+    api(projects.core.datastoreProto)
     implementation(projects.core.common)
     implementation(projects.core.model)
     implementation(libs.androidx.dataStore.core)

core/domain/build.gradle.kts

@@ -16,7 +16,7 @@
 plugins {
     alias(libs.plugins.nowinandroid.android.library)
     alias(libs.plugins.nowinandroid.android.library.jacoco)
-    kotlin("kapt")
+    id("com.google.devtools.ksp")
 }
 
 android {
@@ -30,7 +30,7 @@ dependencies {
     implementation(libs.kotlinx.coroutines.android)
     implementation(libs.kotlinx.datetime)
 
-    kapt(libs.hilt.compiler)
+    ksp(libs.hilt.compiler)
 
     testImplementation(projects.core.testing)
 }

gradle/libs.versions.toml

@@ -37,7 +37,7 @@ gmsPlugin = "4.4.0"
 googleOss = "17.0.1"
 googleOssPlugin = "0.10.6"
 hilt = "2.48.1"
-hiltExt = "1.0.0"
+hiltExt = "1.1.0"
 jacoco = "0.8.7"
 junit4 = "4.13.2"
 kotlin = "1.9.10"

settings.gradle.kts

@@ -41,6 +41,7 @@ include(":core:data")
 include(":core:data-test")
 include(":core:database")
 include(":core:datastore")
+include(":core:datastore-proto")
 include(":core:datastore-test")
 include(":core:designsystem")
 include(":core:domain")

sync/work/build.gradle.kts

@@ -40,7 +40,7 @@ dependencies {
 
     prodImplementation(libs.firebase.cloud.messaging)
 
-    kapt(libs.hilt.ext.compiler)
+    ksp(libs.hilt.ext.compiler)
 
     testImplementation(projects.core.testing)