NPM Scripts
NPM scripts are, well, scripts. We use scripts to automate repetitive tasks. For example, building your project, minifying Cascading Style Sheets (CSS) and JavaScript (JS) files. Scripts are also used in deleting temporary files and folders, etc,. There are many ways to pull this off — you could write bash/batch scripts, or use a task runner like Gulp or Grunt. However, a lot of people are moving over to NPM scripts for their simplicity and versatility. They also offer possibility of having fewer tools to learn, use, and keep track of.
Source : Introduction to NPM Scripts
more details : NPM Script and Why NPM Scripts
npm-run-all
A CLI tool to run multiple npm-scripts in parallel or sequential.
This npm-run-all package provides 3 CLI commands.
npm-run-all
run-s
run-p
The main command is npm-run-all. We can make complex plans with npm-run-all command.
Both run-s and run-p are shorthand commands. run-s is for sequential, run-p is for parallel. We can make simple plans with those commands.