diff --git a/core/src/main/kotlin/Library.kt b/core/src/main/kotlin/Library.kt
index a0cd00a..7979227 100644
--- a/core/src/main/kotlin/Library.kt
+++ b/core/src/main/kotlin/Library.kt
@@ -2,13 +2,12 @@
 
 import com.sdercolin.utaformatix.data.Document
 import core.io.UfData
-import core.model.ProjectContainer
 import core.model.ExportResult
 import core.model.Format
 import core.model.ImportParams
 import core.model.JapaneseLyricsType
+import core.model.ProjectContainer
 import core.process.lyrics.japanese.analyseJapaneseLyricsTypeForProject
-import core.process.lyrics.japanese.convertJapaneseLyrics as convertJapaneseLyricsBase
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.promise
@@ -17,6 +16,7 @@ import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 import org.w3c.files.File
 import kotlin.js.Promise
+import core.process.lyrics.japanese.convertJapaneseLyrics as convertJapaneseLyricsBase
 
 @JsExport
 fun parseVsqx(file: File): Promise<ProjectContainer> = parse(listOf(file), Format.Vsqx)
@@ -124,7 +124,7 @@ fun convertJapaneseLyrics(
     project: ProjectContainer,
     fromType: JapaneseLyricsType,
     targetType: JapaneseLyricsType,
-    convertVowelConnections: Boolean
+    convertVowelConnections: Boolean,
 ): ProjectContainer {
     val baseProject = project.project
     val newProject = core.model.Project(
diff --git a/core/src/main/kotlin/core/exception/CannotReadFileException.kt b/core/src/main/kotlin/core/exception/CannotReadFileException.kt
index e791bfb..d2fb139 100644
--- a/core/src/main/kotlin/core/exception/CannotReadFileException.kt
+++ b/core/src/main/kotlin/core/exception/CannotReadFileException.kt
@@ -1,3 +1,5 @@
 package core.exception
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 class CannotReadFileException : Throwable()
diff --git a/core/src/main/kotlin/core/exception/EmptyProjectException.kt b/core/src/main/kotlin/core/exception/EmptyProjectException.kt
index c8d98e4..43212c2 100644
--- a/core/src/main/kotlin/core/exception/EmptyProjectException.kt
+++ b/core/src/main/kotlin/core/exception/EmptyProjectException.kt
@@ -1,3 +1,5 @@
 package core.exception
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 class EmptyProjectException : Throwable("This format could not take en empty project.")
diff --git a/core/src/main/kotlin/core/exception/IllegalFileException.kt b/core/src/main/kotlin/core/exception/IllegalFileException.kt
index 75e1e7f..5d8c488 100644
--- a/core/src/main/kotlin/core/exception/IllegalFileException.kt
+++ b/core/src/main/kotlin/core/exception/IllegalFileException.kt
@@ -1,5 +1,7 @@
 package core.exception
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 sealed class IllegalFileException(message: String) : Throwable(message) {
     class UnknownVsqVersion : IllegalFileException("Cannot identify the version of the loaded vsqx file.")
     class XmlRootNotFound : IllegalFileException("The root element is not found in the xml file.")
diff --git a/core/src/main/kotlin/core/exception/IllegalNotePositionException.kt b/core/src/main/kotlin/core/exception/IllegalNotePositionException.kt
index 1bb0b7b..c80be2d 100644
--- a/core/src/main/kotlin/core/exception/IllegalNotePositionException.kt
+++ b/core/src/main/kotlin/core/exception/IllegalNotePositionException.kt
@@ -2,6 +2,8 @@ package core.exception
 
 import core.model.Note
 
-class IllegalNotePositionException(note: Note, trackIndex: Int) : Throwable(
+@OptIn(ExperimentalJsExport::class)
+@JsExport
+class IllegalNotePositionException(@Suppress("NON_EXPORTABLE_TYPE") note: Note, trackIndex: Int) : Throwable(
     "Failed to import because note with illegal position(${note.tickOn}) exists in Track No.${trackIndex + 1}",
 )
diff --git a/core/src/main/kotlin/core/exception/NotesOverlappingException.kt b/core/src/main/kotlin/core/exception/NotesOverlappingException.kt
index 98ce791..7295e40 100644
--- a/core/src/main/kotlin/core/exception/NotesOverlappingException.kt
+++ b/core/src/main/kotlin/core/exception/NotesOverlappingException.kt
@@ -1,5 +1,7 @@
 package core.exception
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 class NotesOverlappingException : Throwable(
     "Failed to process because there are notes overlapping with each other.",
 )
diff --git a/core/src/main/kotlin/core/exception/UnsupportedFileFormatError.kt b/core/src/main/kotlin/core/exception/UnsupportedFileFormatError.kt
index 534148e..bc04dee 100644
--- a/core/src/main/kotlin/core/exception/UnsupportedFileFormatError.kt
+++ b/core/src/main/kotlin/core/exception/UnsupportedFileFormatError.kt
@@ -1,5 +1,9 @@
 package core.exception
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 open class UnsupportedFileFormatError : Exception()
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 class UnsupportedLegacyPpsfError : UnsupportedFileFormatError()
diff --git a/core/src/main/kotlin/core/exception/ValueTooLargeException.kt b/core/src/main/kotlin/core/exception/ValueTooLargeException.kt
index 1041d6c..0a7665f 100644
--- a/core/src/main/kotlin/core/exception/ValueTooLargeException.kt
+++ b/core/src/main/kotlin/core/exception/ValueTooLargeException.kt
@@ -1,5 +1,7 @@
 package core.exception
 
+@OptIn(ExperimentalJsExport::class)
+@JsExport
 class ValueTooLargeException(value: String, maxValue: String) : Throwable(
     "Given value $value is larger than the maximum: $maxValue.",
 )