Doubt

I developed an Ionic 2 application and I would like to create extensions for some components already deployed in Ionic 2. Example

For example, I create ngModule and try to extends ionic item but retaining its functionality and interaction with other Ionic components. Make <extended-ion-item> work like <ion-item>, but change <extended-ion-item> template and add new functionality.

https://github.com/SonyStone/ionicExtend-issue

extended-item.ts

import { ChangeDetectionStrategy, Component, ElementRef, Renderer, Optional, ViewEncapsulation } from '@angular/core';

import { Config, Form, ItemReorder, Item } from 'ionic-angular';

import { CopyItem } from './copy-item';

@Component({
	selector: 'extended-ion-item',
	template:
	'<ng-content select="[item-left],ion-checkbox:not([item-right])"></ng-content>' +
	'<div class="item-inner">' +
	'<div class="input-wrapper">' +
	'<ng-content select="ion-label"></ng-content>' +
	'<ion-label *ngIf="_viewLabel">' +
	'<ng-content></ng-content>' +
	'</ion-label>' +
	'<ng-content select="ion-select,ion-input,ion-textarea,ion-datetime,ion-range,[item-content]"></ng-content>' +
	'</div>' +
	'<ng-content select="[item-right],ion-radio,ion-toggle"></ng-content>' +
	'<ion-reorder *ngIf="_shouldHaveReorder"></ion-reorder>' +
	'</div>' +
	'<div class="button-effect"></div>',
	host: {
		'class': 'item'
	},
	changeDetection: ChangeDetectionStrategy.OnPush,
	encapsulation: ViewEncapsulation.None,
})
export class ExtendedItem extends Item {
	constructor(
		form: Form,
		config: Config,
		elementRef: ElementRef,
		renderer: Renderer,
		@Optional() reorder: ItemReorder
	) {
		super(form, config, elementRef, renderer, reorder);
	}
}

module.ts

import { NgModule } from '@angular/core';
import { IonicModule } from 'ionic-angular';
import { BrowserModule } from '@angular/platform-browser';

import { ExtendedItem } from './extended-item';
import { CopyItem } from './copy-item';


@NgModule({
	imports: [
		BrowserModule,
		IonicModule,
	],
	exports: [
		ExtendedItem,
		CopyItem,
	],
	declarations: [
		ExtendedItem,
		CopyItem,
	],
})
export class IonicExtensionModule { }

Problem

But I got this error and really do not know how to solve it.

console

Unhandled Promise rejection: Template parse errors:
More than one component matched on this element.
Make sure that only one component's selector can match a given element.
Conflicting components: Item,PlanExtendedItem ("
	<div class="login-form">

		[ERROR ->]<ion-item padding>

			<ion-label floating>Username</ion-label>
"): Login@42:3