Andrew Linfoot andrewlinfoot

So you want to write a sync system for a web app with offline and realtime support? Good luck. You might find the following resources useful.

Overview articles

Database in a browser, a spec (Stepan Parunashvili)

What problem are we trying to solve with a sync system?
The web of tomorrow (Nikita Prokopov)

Running nightmare on Amazon Linux

You may have thought of running nightmare on AWS Lambda. But before we can run it on Lambda, we need first to make it run on Amazon Linux.

Provision instance which replicates Lambda environment

According to AWS Documentation on Lambda Execution Environment and available Libraries we would need this AMI image with this alias amzn-ami-hvm-2016.03.3.x86_64-gp2. Keep in mind that AMI-image-id for this instance would be different in different regions (eg):

In eu-west-1 - ami-f9dd458a
In us-east-1 - ami-6869aa05

Use these rapid keyboard shortcuts to control the GitHub Atom text editor on macOS.

Key to the Keys

⌘ : Command key
⌃ : Control key
⌫ : Delete key
← : Left arrow key
→ : Right arrow key
↑ : Up arrow key

I had a client who I built a site for (ecommerce) that had a lot of high resolution images. (running about 500gb/mo). Cloudinary charges $500/mo for this usage and Amazon charges about $40. I wrote some middleware that I used to wrap my cloudinary urls with in order to enable caching. This is entirely transparent and still enables you to use all the cool cloudinary effect and resizing functions. Hopefully this is useful to someone!

I think using deasync() here is janky but I couldn't think of another way to do it that allowed for quite as easy a fix.

Creating new Field Types for KeystoneJS

We're currently working on making it easier to add new field types to KeystoneJS as plugins.

In the meantime, if you'd like to work on your own field type, hopefully this guide will point you in the right direction.

Keystone fields require the following:

a {fieldType}.js file in ./lib/fieldTypes that controls the field and encapsulates options support, underscore functions, validation and updating
the {fieldType}.js file needs to be included by ./lib/fieldTypes/index.js

	You are Manus, an AI agent created by the Manus team.

	You excel at the following tasks:
	1. Information gathering, fact-checking, and documentation
	2. Data processing, analysis, and visualization
	3. Writing multi-chapter articles and in-depth research reports
	4. Creating websites, applications, and tools
	5. Using programming to solve various problems beyond development
	6. Various tasks that can be accomplished using computers and the internet

	//
	// Device.swift
	// imHome
	//
	// Created by Kevin Xu on 2/9/15. Updated on 6/20/15.
	// Copyright (c) 2015 Alpha Labs, Inc. All rights reserved.
	//

	import Foundation

	// Includes functions for exporting active sheet or all sheets as JSON object (also Python object syntax compatible).
	// Tweak the makePrettyJSON_ function to customize what kind of JSON to export.

	var FORMAT_ONELINE = 'One-line';
	var FORMAT_MULTILINE = 'Multi-line';
	var FORMAT_PRETTY = 'Pretty';

	var LANGUAGE_JS = 'JavaScript';
	var LANGUAGE_PYTHON = 'Python';

	var flattenObject = function(ob) {
	var toReturn = {};

	for (var i in ob) {
	if (!ob.hasOwnProperty(i)) continue;

	if ((typeof ob[i]) == 'object') {
	var flatObject = flattenObject(ob[i]);
	for (var x in flatObject) {
	if (!flatObject.hasOwnProperty(x)) continue;