Node.js / JS / Typescript

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.

Installation

Using Homebrew

brew install node

Using Node Version Manager (nvm)

Download and install nvm by running:

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.1/install.sh | bash

Then download Node and select your version by running:

source ~/.bashrc        # source your bashrc/zshrc to add nvm to PATH
command -v nvm          # check the nvm use message
nvm install node        # install most recent Node stable version
nvm ls                  # list installed Node version
nvm use node            # use stable as current version
nvm ls-remote           # list all the Node versions you can install
nvm alias default node  # set the installed stable version as the default Node

See the documentation for information.

npm usage

To install a package:

npm install <package> # Install locally
npm install -g <package> # Install globally

To install a package and save it in your project's package.json file:

npm install <package> --save

To see what's installed:

npm list [-g]

To find outdated packages:

npm outdated [-g]

To upgrade all or a particular package:

npm update [-g] [<package>]

To uninstall a package:

npm uninstall [-g] <package>

Typescript

Project Setup

# create project folder
mkdir sample-project
# initialize the npm repo
npm init -y
# initalize the typescript project within your repo (will generate the tsconfig that defines how the ts code is transpiled to js)
npx tsc --init
# install node types
npm i -D @types/node

Develop Typescript Backend

As typescript is a transpiled language you develop your app like in this example project / more mature sample. For a aws lambda sample follow here.

Basics

• The basics are explained in the offical Handbook
• Anotate existing npm packeges with types with a delcaration file. You can use dts-gen to make it easier.
• How to export modules.