NPM Commands

Question 0

Run commands from npm & package.json

Run multiple commands sequentially; run parallel

Answer 0

# package.json
# (`watch` will actually have mocha and node listening and print both results to console.)
{
  ...
  "scripts": {
    "test": "mocha --timeout=4000",
    "watch": "node server.js & mocha -w"
  }
}

npm run name will search inside the package.json script object for a property named name & execute the value. Even cooler, when the execution occurs, $PATH is manipulated to point to the current directory. This means even though we execute the mocha command, we do not have to have mocha installed globally! Awesome!

npm run test
npm run watch

To run commands sequentially, use the && operator; parallel, use &.
Example

# run mocha test THEN run jshint
mocha && jshint

# run mocha watch while running node watch
node server.js & mocha -w

Question 1

Check if packages are outdated

Answer 1

# check all packages
npm outdated

# check single package
npm outdated name

Question 2

Default command to start server

Default command to run tests

Answer 2

# alias for npm run start
npm start

Question 2

Install package by package name

Answer 2

npm install name

Question 3

Uninstall package by package name

Answer 3

npm rm name

Question 5

Install packages in package.json file

Which packages are installed?

Answer 5

npm install

Question 6

Install packages in package.json file

Which packages are installed?

Answer 6

npm install

Both dependencies & dev-dependencies are installed.

Question 8

Uninstall package by package name and remove from package.json

Answer 8

npm rm name –save

npm rm name –save-dev

Question 9

How to not install dev-dependencies?

Answer 9

npm install –production