👉 Issues with Gradle Kotlin DSL and `-Xopt-in` deprecation : KT-51708 

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
   kotlinOptions {
     allWarningsAsErrors = false
     freeCompilerArgs += [
         "-Xopt-in=kotlin.RequiresOptIn",
         "-Xopt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
         "-Xopt-in=kotlinx.coroutines.FlowPreview",
         "-Xopt-in=kotlinx.serialization.ExperimentalSerializationApi",
         "-Xopt-in=kotlin.Experimental",
     ]
   }
 }

'-Xopt-in' → '-opt-in'

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
   kotlinOptions {
     allWarningsAsErrors = false
     freeCompilerArgs += [
         "-opt-in=kotlin.RequiresOptIn",
         "-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
         "-opt-in=kotlinx.coroutines.FlowPreview",
         "-opt-in=kotlinx.serialization.ExperimentalSerializationApi",
         "-opt-in=kotlin.Experimental",
     ]
   }
 }

単純に gradle ファイル内、文字列の置換で完。

コード内アノテーションで利用の人はそのままでいいんかな。

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