Fix sample-viewmodel running (#430)

```
Caused by: java.lang.IllegalArgumentException: Cannot serialize Kotlin type com.example.molecule.viewmodel.PupperPicsApi$ListResponse.
Reflective serialization of Kotlin classes without using kotlin-reflect has undefined and unexpected behavior.
Please use KotlinJsonAdapterFactory from the moshi-kotlin artifact or use code gen from the moshi-kotlin-codegen artifact.
  at com.squareup.moshi.ClassJsonAdapter$1.create(ClassJsonAdapter.java:98)
  at com.squareup.moshi.Moshi.adapter(Moshi.java:146)
  at com.squareup.moshi.Moshi.adapter(Moshi.java:106)
```

Co-authored-by: Jake Wharton <[email protected]>

build.gradle

@@ -3,6 +3,7 @@ buildscript {
     classpath libs.android.plugin
     classpath libs.kotlin.plugin.core
     classpath libs.kotlin.plugin.compose
+    classpath libs.kotlin.ksp.plugin
     classpath libs.maven.publish.plugin
     classpath libs.dokka.plugin
     classpath libs.spotless.plugin

gradle/libs.versions.toml

@@ -29,6 +29,7 @@ junit = { module = "junit:junit", version = "4.13.2" }
 kotlin-plugin-core = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 kotlin-plugin-compose = { module = "org.jetbrains.kotlin:compose-compiler-gradle-plugin", version.ref = "kotlin" }
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
+kotlin-ksp-plugin = "com.google.devtools.ksp:com.google.devtools.ksp.gradle.plugin:2.0.0-1.0.21"
 
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "coroutine" }
 kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "coroutine" }
@@ -47,6 +48,7 @@ squareup-okhttp-logging-interceptor = { module = "com.squareup.okhttp3:logging-i
 squareup-retrofit-client = { module = "com.squareup.retrofit2:retrofit", version.ref = "squareup-retrofit" }
 squareup-retrofit-converter-scalars = { module = "com.squareup.retrofit2:converter-scalars", version.ref = "squareup-retrofit" }
 squareup-retrofit-converter-moshi = { module = "com.squareup.retrofit2:converter-moshi", version.ref = "squareup-retrofit" }
+squareup-moshi-codegen = "com.squareup.moshi:moshi-kotlin-codegen:1.15.1"
 
 assertk = "com.willowtreeapps.assertk:assertk:0.28.1"
 turbine = { module = "app.cash.turbine:turbine", version = "1.1.0" }

renovate.json5

@@ -3,4 +3,14 @@
   "extends": [
     "config:base"
   ],
+  "packageRules": [
+    {
+      // KSP is tightly coupled to Kotlin version.
+      "groupName": "Kotlin/KSP",
+      "matchPackagePrefixes": [
+        "org.jetbrains.kotlin:kotlin",
+        "com.google.devtools.ksp",
+      ],
+    },
+  ],
 }

sample-viewmodel/build.gradle

@@ -1,6 +1,7 @@
 apply plugin: 'com.android.application'
 apply plugin: 'org.jetbrains.kotlin.android'
 apply plugin: 'org.jetbrains.kotlin.plugin.compose'
+apply plugin: 'com.google.devtools.ksp'
 
 dependencies {
   implementation projects.moleculeRuntime
@@ -11,6 +12,8 @@ dependencies {
   implementation libs.squareup.retrofit.client
   implementation libs.squareup.retrofit.converter.moshi
 
+  ksp libs.squareup.moshi.codegen
+
   testImplementation libs.junit
   testImplementation libs.kotlinx.coroutines.test
   testImplementation libs.turbine

sample-viewmodel/src/main/java/com/example/molecule/viewmodel/data.kt

@@ -15,6 +15,7 @@
  */
 package com.example.molecule.viewmodel
 
+import com.squareup.moshi.JsonClass
 import retrofit2.Retrofit
 import retrofit2.converter.moshi.MoshiConverterFactory
 import retrofit2.create
@@ -50,13 +51,16 @@ fun PupperPicsService(): PupperPicsService {
   }
 }
 
-private interface PupperPicsApi {
+interface PupperPicsApi {
   @GET("breeds/list/all")
   suspend fun listBreeds(): ListResponse
 
   @GET("breed/{breed}/images/random")
   suspend fun randomImageFor(@Path("breed", encoded = true) breed: String): ImageResponse
 
+  @JsonClass(generateAdapter = true)
   data class ListResponse(val message: Map<String, List<String>>)
+
+  @JsonClass(generateAdapter = true)
   data class ImageResponse(val message: String)
 }