Example of Sequelize with sql.js

example.js

var lib = require('./patch.js');
var Sequelize = require('sequelize');

var sequelize = new Sequelize('sqlite://dbname', {dialectModulePath: 'sql.js'});

var User = sequelize.define('user', {
  username: Sequelize.STRING,
  birthday: Sequelize.DATE
});

sequelize.sync().then(function() {
  return User.create({
    username: 'janedoe',
    birthday: new Date(1980, 6, 20)
  });
}).then(function(jane) {
  console.log(jane.get({
    plain: true
  }));
});

patch.js

"use strict";

var lib = require('sql.js');
    lib.verbose = function() {
        return lib;
    }

    lib._Database = lib.Database;
    lib.Database = class Db extends lib._Database {
        constructor(filename, mode, cb) {
            super();
            process.nextTick(cb, null);
        }

        //I'm not 100% sure what this was supposed to do on node-sqlite3, heh.
        serialize(cb) {
            process.nextTick(cb);
        }

        run(sql, params, cb) {
            super.run(sql, params);
            var ctx = {};
            if (sql.toLowerCase().indexOf('insert') !== -1) {
                var rez = this.exec("select last_insert_rowid();");
                ctx.lastID = rez[0].values[0][0];
            }
            if (cb) {
                process.nextTick(cb.bind(ctx), null);
            }
            return this;
        }

        all(sql, params, cb) {
            var result = [];
            this.each(sql, params,
            function(r) {
                result.push(r);
            },
            function() {
                cb(null, result);
            });
            return this;
        }

        close () {

        }
    }

module.export = lib;

Nice @catamphetamine