diff --git a/mirai-core-api/src/commonMain/kotlin/internal/message/MessageSerializersImpl.kt b/mirai-core-api/src/commonMain/kotlin/internal/message/MessageSerializersImpl.kt
index bf201e955..e7a99ed28 100644
--- a/mirai-core-api/src/commonMain/kotlin/internal/message/MessageSerializersImpl.kt
+++ b/mirai-core-api/src/commonMain/kotlin/internal/message/MessageSerializersImpl.kt
@@ -23,27 +23,11 @@ import net.mamoe.mirai.Mirai
 import net.mamoe.mirai.message.MessageSerializers
 import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.utils.MiraiInternalApi
+import net.mamoe.mirai.utils.takeElementsFrom
 import kotlin.reflect.KClass
 import kotlin.reflect.full.allSuperclasses
 import kotlin.reflect.full.isSubclassOf
 
-internal fun SerialDescriptor.copy(newName: String): SerialDescriptor =
-    buildClassSerialDescriptor(newName) { takeElementsFrom(this@copy) }
-
-
-internal fun ClassSerialDescriptorBuilder.takeElementsFrom(descriptor: SerialDescriptor) {
-    with(descriptor) {
-        repeat(descriptor.elementsCount) { index ->
-            element(
-                elementName = getElementName(index),
-                descriptor = getElementDescriptor(index),
-                annotations = getElementAnnotations(index),
-                isOptional = isElementOptional(index),
-            )
-        }
-    }
-}
-
 @MiraiInternalApi
 public open class MessageSourceSerializerImpl(serialName: String) :
     KSerializer<MessageSource> by SerialData.serializer().map(
diff --git a/mirai-core-api/src/commonMain/kotlin/message/data/FileMessage.kt b/mirai-core-api/src/commonMain/kotlin/message/data/FileMessage.kt
index 06fae3e1a..69b0064a6 100644
--- a/mirai-core-api/src/commonMain/kotlin/message/data/FileMessage.kt
+++ b/mirai-core-api/src/commonMain/kotlin/message/data/FileMessage.kt
@@ -20,14 +20,10 @@ import net.mamoe.kjbb.JvmBlockingBridge
 import net.mamoe.mirai.Mirai
 import net.mamoe.mirai.contact.FileSupported
 import net.mamoe.mirai.event.events.MessageEvent
-import net.mamoe.mirai.internal.message.copy
 import net.mamoe.mirai.internal.message.map
 import net.mamoe.mirai.message.code.CodableMessage
 import net.mamoe.mirai.message.code.internal.appendStringAsMiraiCode
-import net.mamoe.mirai.utils.MiraiExperimentalApi
-import net.mamoe.mirai.utils.MiraiInternalApi
-import net.mamoe.mirai.utils.RemoteFile
-import net.mamoe.mirai.utils.safeCast
+import net.mamoe.mirai.utils.*
 
 /**
  * 文件消息.
diff --git a/mirai-core-utils/src/commonMain/kotlin/Serialization.kt b/mirai-core-utils/src/commonMain/kotlin/Serialization.kt
index 7b6e57b4b..85e5e9724 100644
--- a/mirai-core-utils/src/commonMain/kotlin/Serialization.kt
+++ b/mirai-core-utils/src/commonMain/kotlin/Serialization.kt
@@ -15,6 +15,9 @@ package net.mamoe.mirai.utils
 
 import kotlinx.serialization.DeserializationStrategy
 import kotlinx.serialization.StringFormat
+import kotlinx.serialization.descriptors.ClassSerialDescriptorBuilder
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.descriptors.buildClassSerialDescriptor
 import java.io.File
 
 public fun <T> File.loadNotBlankAs(
@@ -26,3 +29,20 @@ public fun <T> File.loadNotBlankAs(
     }
     return stringFormat.decodeFromString(serializer, this.readText())
 }
+
+
+public fun SerialDescriptor.copy(newName: String): SerialDescriptor =
+    buildClassSerialDescriptor(newName) { takeElementsFrom(this@copy) }
+
+public fun ClassSerialDescriptorBuilder.takeElementsFrom(descriptor: SerialDescriptor) {
+    with(descriptor) {
+        repeat(descriptor.elementsCount) { index ->
+            element(
+                elementName = getElementName(index),
+                descriptor = getElementDescriptor(index),
+                annotations = getElementAnnotations(index),
+                isOptional = isElementOptional(index),
+            )
+        }
+    }
+}