Mugilan E.S. Mugilan-Codes

In computing, memoization or memoisation
is an optimization technique used primarily
to speed up computer programs by storing
the results of expensive function calls and
returning the cached result when the same
inputs occur again.
— wikipedia

Pure ESM package

The package that linked you here is now pure ESM. It cannot be require()'d from CommonJS.

This means you have the following choices:

Use ESM yourself. (preferred)
Use import foo from 'foo' instead of const foo = require('foo') to import the package. You also need to put "type": "module" in your package.json and more. Follow the below guide.
If the package is used in an async context, you could use await import(…) from CommonJS instead of require(…).
Stay on the existing version of the package until you can move to ESM.

Node.js Deployment

Steps to deploy a Node.js app to DigitalOcean using PM2, NGINX as a reverse proxy and an SSL from LetsEncrypt

1. Sign up for Digital Ocean

If you use the referal link below, you get $10 free (1 or 2 months) https://m.do.co/c/5424d440c63a

2. Create a droplet and log in via ssh

I will be using the root user, but would suggest creating a new user

Docker Commands, Help & Tips

Show commands & management commands

$ docker

Docker version info

When you create a npm package, remember it might be used in a browser or a server, or even a command line utility… For each package you create, please pay attention at what it will be used for:

Is it going to be used as a dependency to a nodejs application that is not bundled? (e.g. command line utilities)
Is it going to be used as a dependency to a nodejs application that is bundled? (e.g. AWS Lambdas)
Is it going to be used as a dependency to a browser application (always bundled)?.

In cases 2) and 3) you want to allow for tree shaking.
In cases 1) and 2) you want to benefit from the "ES6"/"ES next" features supported natively by nodejs.
In case 3) you also want to benefit from the native support of "ES6" from your browser.

How to migrate Django from SQLite to PostgreSQL

Dump existing data:

python3 manage.py dumpdata > datadump.json

Change settings.py to Postgres backend.

Make sure you can connect on PostgreSQL. Then:

tmux Cheat Sheet

Table of Contents

General Usage
Shortcuts
Commands
Scripting tmux
Configuring tmux

We subscribe to the Git Featrue Branch workflow, briefly described in that link.

In practice, it works as follows:

FEATURE DEVELOPMENT

Steps to Follow:

Start with an updated local development branch -- by checking out the dev branch and pulling changes:
git checkout development
git pull origin development

	'use strict'

	// examples from https://github.com/vriad/zod

	// trying to use zod in JS w/ jsdoc type comments in vsCode

	const z = require('zod')

	const dogSchema = z.object({
	name: z.string(),

	type DeepReadonly<T> = {
	readonly [P in keyof T]
	: DeepReadonly<T[P]>;
	}