Install nvm and node v11.6 if not installed

nvm --version # to check if nvm is not installed
# if nvm is not installed run this else skip
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash

nvm install 11.6
nvm use
npm i -g yarn
yarn install

To run the typescript and server in watch node
Both are continuous command will need to be run in different terminal

npm run watch-ts
npm run watch-node

To compile typescript code once

npm run tsc

To run server once the build is done manually or automatically

npm run serve