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installation

node

command line arguments

RUNNING YOUR CODE

# Evaluates the current argument as JavaScript
node --eval
# Checks the syntax of a script without executing it
node --check
# Opens the node.js REPL (Read-Eval-Print-Loop)
node --interactive
# Pre-loads a specic module at start-up
node --require
# Silences the deprecation warnings
node --no-deprecation
# Silences all warnings (including deprecations)
node --no-warnings
# Environment variable that you can use to set command line options
echo $NODE_OPTIONS

CODE HYGIENE

# Emits pending deprecation warnings
node --pending-deprecation
# Prints the stack trace for deprecations
node --trace-deprecation
Throws error on deprecation
node --throw-deprecation
Prints the stack trace for warnings
node --trace-warnings

INITIAL PROBLEM INVESTIGATION

# Generates node report on signal
node --report-on-signal
# Generates node report on fatal error
node --report-on-fatalerror
# Generates diagnostic report on uncaught exceptions
node --report-uncaught-exception

CONTROLLING/INVESTIGATING MEMORY USE

# Sets the size of the heap
--max-old-space-size
# Turns on gc logging
--trace_gc
# Enables heap proling
--heap-prof
# Generates heap snapshot on specied signal
--heapsnapshot-signal=signal

CPU PERFORMANCE INVESTIGATION

# Generates V8 proler output.
--prof
# Process V8 proler output generated using --prof
--prof-process
# Starts the V8 CPU proler on start up, and write the CPU prole to disk before exit
--cpu-prof

DEBUGGING

# Activates inspector on host:port and break at start of user script
--inspect-brk[=[host:]port]
# Activates inspector on host:port (default: 127.0.0.1:9229)
--inspect[=[host:]port]

npm

proxy

npm config ls
npm config get https-proxy
npm config set https-proxy [url:port]

proxy in .npmrc

vim ~/.npmrc
proxy=http://user:[email protected]:8080/
https-proxy=http://user:[email protected]:8080/
;prefix=~/.npm-global

npm version

npm info coa
npm info coa versions

check installation

npm bin -g

package control

# best practice
# package-lock.json must have be present in root ( under git control )
npm ci

permission denied for folder /usr/lib

# create new folder where node will place all packages
mkdir ~/.npm-global

# Configure npm to use new folder
npm config set prefix '~/.npm-global'

# update your settings in ```vim ~/.profile```
export PATH=~/.npm-global/bin:$PATH

npm commands

print high level packages

npm list -g --depth=0

reinstall package globally

npm search @angular
npm uninstall -g @angular/cli
npm cache clear --force
npm install -g @angular/cli

show package version

npm show styled-components@* version

install package version

npm install [email protected]
# if you don't know certain version
npm install styled-components@^3.0.0

build project ( install dependencies )

npm install
npm start

start from different folder, start with special marker

npm start --prefix /path/to/api "special_app_marker_for_ps_aux"

start with different port

  • package.json solution
 "scripts": {"start": "PORT=3310 node ./bin/www"},
  • npm solution
PORT=$PORT npm start --prefix $PROJECT_HOME/api

eject configuration to static files

npm run eject
# config/webpack.config.dev.js
# config/webpack.config.prod.js
# config/webpackDevServer.config.js
# config/env.js
# config/paths.js
# config/polyfills.js

yarn package manager

installation

configuration

yarn config list

NextJS

npx create-next-app my-app

start nextjs

npm run-script build
npm run-script start
# or ( the same for debug )
node server.js