packages/node_modules/pouchdb-adapter-websql/src/index.js

import WebSqlPouchCore from 'pouchdb-adapter-websql-core';
import {guardedConsole} from 'pouchdb-utils';

import valid from './valid';

function openDB(name, version, description, size) {
  // Traditional WebSQL API
  return openDatabase(name, version, description, size);
}

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);
}

WebSQLPouch.valid = valid;

WebSQLPouch.use_prefix = true;

export default function (PouchDB) {
  PouchDB.adapter('websql', WebSQLPouch, true);
}