import { VNodeData } from 'vue'

/**
 * Removes duplicate `@input` listeners when
 * using v-model with functional components
 *
 * @see https://github.com/vuetifyjs/vuetify/issues/4460
 */
export default function dedupeModelListeners (data: VNodeData): void {
  if (data.model && data.on && data.on.input) {
    if (Array.isArray(data.on.input)) {
      const i = data.on.input.indexOf(data.model.callback)
      if (i > -1) data.on.input.splice(i, 1)
    } else {
      delete data.on.input
    }
  }
}