bootstrap-vue/esm/mixins/form-state.js

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/* Form control contextual state class computation
 *
 * Returned class is either 'is-valid' or 'is-invalid' based on the 'state' prop
 * state can be one of five values:
 *  - true for is-valid
 *  - false for is-invalid
 *  - null for no contextual state
 */
import { isBoolean } from '../utils/inspect'; // @vue/component

export default {
  props: {
    state: {
      // Tri-state prop: true, false, null (or undefined)
      type: Boolean,
      default: null
    }
  },
  computed: {
    computedState: function computedState() {
      // If not a boolean, ensure that value is null
      return isBoolean(this.state) ? this.state : null;
    },
    stateClass: function stateClass() {
      var state = this.computedState;
      return state === true ? 'is-valid' : state === false ? 'is-invalid' : null;
    }
  }
};