How to use the pouchdb-adapter-websql-core.call function in pouchdb-adapter-websql-core

function NodeWebSqlPouch(opts, callback) {
  var _opts = Object.assign({
    websql: websql // pass node-websql in as our "openDatabase" function
  }, opts);

  WebSqlPouchCore.call(this, _opts, callback);
}

websql: websql
  }, opts)

  if (typeof cordova === 'undefined' || (typeof sqlitePlugin === 'undefined' && typeof openDatabase === 'undefined')) {
    console.error(
      'PouchDB error: you must install a SQLite plugin ' +
      'in order for PouchDB to work on this platform. Options:' +
      '\n - https://github.com/nolanlawson/cordova-plugin-sqlite-2' +
      '\n - https://github.com/litehelpers/Cordova-sqlite-storage' +
      '\n - https://github.com/Microsoft/cordova-plugin-websql')
  }

  if ('default' in WebSqlPouchCore && typeof WebSqlPouchCore.default.call === 'function') {
    WebSqlPouchCore.default.call(this, _opts, callback)
  } else {
    WebSqlPouchCore.call(this, _opts, callback)
  }
}

function ReactNativeSQLitePouch (opts, callback) {
  var websql = createOpenDBFunction(opts)
  var _opts = Object.assign({
    websql: websql
  }, opts)

  WebSqlPouchCore.call(this, _opts, callback)
}

function WebSQLPouch(opts, callback) {
  var msg = 'WebSQL is deprecated and will be removed in future releases of PouchDB. ' +
      'Please migrate to IndexedDB: https://pouchdb.com/2018/01/23/pouchdb-6.4.2.html';
  guardedConsole('warn', msg);
  var _opts = Object.assign({
    websql: openDB
  }, opts);

  WebSqlPouchCore.call(this, _opts, callback);
}