Elastic ion-textarea

[sababa]

import {HostListener, Directive} from '@angular/core';
@Directive({
    selector: '[elastic]'
})
export class Elastic {
    @HostListener('input',['$event.target'])
    onInput(nativeElement: any): void {
        nativeElement.style.height = nativeElement.scrollHeight + "px";
    }
}

<ion-textarea elastic></ion-textarea>