-import { pairwise } from 'rxjs/operators'
-import { concat, of } from 'rxjs'
+import { UserService } from '@app/core'
+import { VIDEO_CHANNEL_DISPLAY_NAME_VALIDATOR, VIDEO_CHANNEL_NAME_VALIDATOR } from '@app/shared/form-validators/video-channel-validators'
+import { FormReactive, FormValidatorService } from '@app/shared/shared-forms'