suspend fun createOrUpdateIntrospectionFile()

in src/main/com/intellij/lang/jsgraphql/ide/introspection/GraphQLIntrospectionSchemaWriter.kt [55:110]
50 lines of code
4 McCabe index (conditional complexity)

  suspend fun createOrUpdateIntrospectionFile(output: IntrospectionOutput, dir: VirtualFile, fileName: String) {
    val header = when (output.format) {
      IntrospectionOutputFormat.SDL -> "# This file was generated. Do not edit manually.\n\n"
      IntrospectionOutputFormat.JSON -> ""
    }

    val fileDocumentManager = FileDocumentManager.getInstance()
    val psiDocumentManager = PsiDocumentManager.getInstance(project)

    try {
      val outputFile = withContext(Dispatchers.EDT) {
        runUndoTransparentWriteAction {
          createOrUpdateSchemaFile(project, dir, FileUtil.toSystemIndependentName(fileName))
        }
      }

      val document = readAndEdtWriteAction {
        val document = fileDocumentManager.getDocument(outputFile)
                       ?: throw IOException("Unable to get document for created introspection file: $outputFile")
        writeAction {
          CommandProcessor.getInstance().withUndoTransparentAction().use {
            document.setText(StringUtil.convertLineSeparators(header + output.schemaText))
            psiDocumentManager.commitDocument(document)
            document
          }
        }
      }

      reformatDocumentIfNeeded(psiDocumentManager, outputFile, document)

      edtWriteAction {
        psiDocumentManager.doPostponedOperationsAndUnblockDocument(document)
        psiDocumentManager.commitDocument(document)
        fileDocumentManager.saveDocument(document)
      }

      openSchemaInEditor(project, outputFile)
    }
    catch (e: CancellationException) {
      throw e
    }
    catch (e: IOException) {
      LOG.info(e)
      val notification = Notification(
        GRAPHQL_NOTIFICATION_GROUP_ID,
        GraphQLBundle.message("graphql.notification.error.title"),
        GraphQLBundle.message("graphql.notification.unable.to.create.file", fileName, dir.path),
        NotificationType.ERROR
      )
      addShowQueryErrorDetailsAction(project, notification, e)
      Notifications.Bus.notify(notification)
    }
    catch (e: Exception) {
      LOG.error(e)
    }
  }