bootstrap-vue/src/utils/bv-event.class.js

BootstrapVue, with over 40 plugins and more than 75 custom components, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated WAI-ARIA accessibility markup.

import { assign, defineProperty, defineProperties, readonlyDescriptor } from './object'

class BvEvent {
  constructor(type, eventInit = {}) {
    // Start by emulating native Event constructor.
    if (!type) {
      /* istanbul ignore next */
      throw new TypeError(
        `Failed to construct '${this.constructor.name}'. 1 argument required, ${
          arguments.length
        } given.`
      )
    }
    // Assign defaults first, the eventInit,
    // and the type last so it can't be overwritten.
    assign(this, BvEvent.Defaults, this.constructor.Defaults, eventInit, { type })
    // Freeze some props as readonly, but leave them enumerable.
    defineProperties(this, {
      type: readonlyDescriptor(),
      cancelable: readonlyDescriptor(),
      nativeEvent: readonlyDescriptor(),
      target: readonlyDescriptor(),
      relatedTarget: readonlyDescriptor(),
      vueTarget: readonlyDescriptor(),
      componentId: readonlyDescriptor()
    })
    // Create a private variable using closure scoping.
    let defaultPrevented = false
    // Recreate preventDefault method. One way setter.
    this.preventDefault = function preventDefault() {
      if (this.cancelable) {
        defaultPrevented = true
      }
    }
    // Create 'defaultPrevented' publicly accessible prop
    // that can only be altered by the preventDefault method.
    defineProperty(this, 'defaultPrevented', {
      enumerable: true,
      get() {
        return defaultPrevented
      }
    })
  }

  static get Defaults() {
    return {
      type: '',
      cancelable: true,
      nativeEvent: null,
      target: null,
      relatedTarget: null,
      vueTarget: null,
      componentId: null
    }
  }
}

// Named Exports
export { BvEvent }

// Default Export
export default BvEvent