bootstrap-vue/src/components/form/form-invalid-feedback.js

BootstrapVue provides one of the most comprehensive implementations of Bootstrap 4 components and grid system for Vue.js and with extensive and automated WAI-ARIA accessibility markup.

import { mergeData } from 'vue-functional-data-merge'

export const props = {
  id: {
    type: String,
    default: null
  },
  tag: {
    type: String,
    default: 'div'
  },
  forceShow: {
    type: Boolean,
    default: false
  }
}

export default {
  functional: true,
  props,
  render (h, { props, data, children }) {
    return h(
      props.tag,
      mergeData(data, {
        staticClass: 'invalid-feedback',
        class: { 'd-block': props.forceShow },
        attrs: { id: props.id }
      }),
      children
    )
  }
}