@bhaskarmantralahub/demo-nodejs v1.0.0

Node.js is essentially a Javascript runtime built on top of Chrome’s V8 Javascript engine.

Single-Threaded Event Loop Architecture in Node.js

https://www.youtube.com/watch?v=xckH5s3UuX4

Following are not part of Javascript, but browser web api https://www.youtube.com/watch?v=8zKuNo4ay8E

More details on Nodejs

https://scoutapm.com/blog/nodejs-architecture-and-12-best-practices-for-nodejs-development

~ % brew install node

~ % tsc -v Version 4.8.4

~ % npm -v
8.19.2

npm will be installed along nodejs

1. Create a node-js project from Webstorm
2. npm --init => Creates package.json and package-lock.json
3. Install typescript npm install typescript --save-dev => Creates tsconfig.json
4. Install ts-node npm install ts-node --save-dev

Run Configuration - Webstorm

https://www.jetbrains.com/help/webstorm/running-and-debugging-typescript.html#ws_ts_run_debug_server_side

Event Loop

Event loop polls and checks for any items in callback queue and move them to call stack for execution.

It constantly keeps track of the status of your asynchronous tasks (eg. the code in your callback functions) and moves them back to the execution queue when they’re completed. It operates in the same main thread.

Worker Pool - Auxiliary synchronous threads in the system kernel that Node.js can utilize for extensive disk and network-based async operations

ESLint Config npm init @eslint/config

(OR)

Install ESLint Manually

npm install eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin --save-dev

• eslint: ESLint core library
• @typescript-eslint/parser: parser that allows ESLint to understand TypeScript code
• @typescript-eslint/eslint-plugin: plugin with a set of recommended TypeScript rules

Install Prettier

npm install eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin --save-dev

Specify Node Versions with package n

npm install -g n

Install node specific version with 'n'

sudo n 14

List down all the available node vesions installed on machine

> n ls
node/14.21.2
node/19.3.0

Switch to specific version

> n
  ο node/14.21.2
  ο node/19.3.0

#### Use up/down arrow keys to select a version, return key to install, d to delete, q to quit

https://www.npmjs.com/package/n

Specify Node Versions with .nvmrc (Node Version Manager)

Install Node Version Manager : https://github.com/nvm-sh/nvm

node -v > .nvmrc => Is specifying that Node.js should be used

nvm use => To download, install, and switch to that version

nvm install => Call would then install dependencies in line with that version.

What is rc file stand for?

rc - run commands

• .program or binary namerc
• .eslintrc
• .zshrc

• .nvmrc

Jetbrains avoid finding JS extension files while working with Typescript files

Right click on build directory where js extension files exist and mark it as excluded

useful npm packages

useful npm packages