How to use the @material/snackbar/foundation.js.strings function in @material/snackbar

*/
import {addHasRemoveClass, BaseElement, observer} from '@material/mwc-base/base-element.js';
import {MDCSnackbarAdapter} from '@material/snackbar/adapter.js';
import MDCSnackbarFoundation from '@material/snackbar/foundation.js';
import {MDCSnackbarCloseEventDetail} from '@material/snackbar/types';
import {html, property, query} from 'lit-element';
import {classMap} from 'lit-html/directives/class-map';

import {accessibleSnackbarLabel} from './accessible-snackbar-label-directive';

const {
  OPENING_EVENT,
  OPENED_EVENT,
  CLOSING_EVENT,
  CLOSED_EVENT,
} = MDCSnackbarFoundation.strings;

export class SnackbarBase extends BaseElement {
  protected mdcFoundation!: MDCSnackbarFoundation;

  protected readonly mdcFoundationClass = MDCSnackbarFoundation;

  @query('.mdc-snackbar') protected mdcRoot!: HTMLElement;

  @query('.mdc-snackbar__label') protected labelElement!: HTMLElement;

  @property({type: Boolean, reflect: true}) isOpen = false;

  @observer(function(this: SnackbarBase, value: number) {
    this.mdcFoundation.setTimeoutMs(value);
  })
  @property({type: Number})