How to use the ember-power-select/components/power-select-multiple/trigger.extend function in ember-power-select

import EmberPowerSelectMultipleTrigger from 'ember-power-select/components/power-select-multiple/trigger';
import {assert} from '@ember/debug';
import {get} from '@ember/object';
import {isBlank} from '@ember/utils';

export default EmberPowerSelectMultipleTrigger.extend({

    actions: {
        chooseOption(option) {
            this.select.actions.choose(option);
        },

        handleOptionMouseDown(event) {
            if (!event.target.closest('[data-selected-index]')) {
                let action = this.get('extra.optionMouseDown');
                if (action) {
                    return action(event);
                }
            }
        },

        handleOptionTouchStart(event) {