import * as Toastr from 'toastr';
import './/../node_modules/toastr/build/toastr.css'; //You need style and css loader installed and set

    Toastr.options = {
        closeButton: false,
        newestOnTop: false,
        progressBar: false,
        positionClass: 'toast-bottom-right',
        preventDuplicates: false,
        onclick: null,
        showDuration: 300,
        hideDuration: 1000,
        timeOut: 5000,
        extendedTimeOut: 1000,
        showEasing: 'swing',
        hideEasing: 'linear',
        showMethod: 'fadeIn',
        hideMethod: 'fadeOut',
    };

Toastr.info('This works!');