Get count of items/files in list/document library in SharePoint Online with SPFx

tsx

import { SPHttpClient, SPHttpClientResponse, SPHttpClientConfiguration } from '@microsoft/sp-http';

this.context.spHttpClient.get(`${this.context.pageContext.web.absoluteUrl}/_api/web/AppTiles`, SPHttpClient.configurations.v1)
  .then((response: SPHttpClientResponse) => {
    response.json()
      .then((responseJSON: any) => {
        console.log(responseJSON); // Gets all the list and document library details in JSON
      })
      .catch(error => {
        console.log(error);
      });
  })
  .catch(error => {
    console.log(error);
  });
  
 // this.context refers to WebPartContext in the BaseClientSideWebPart class.