Initialize a new project

yarn init --yes #  Abbreviation  -y 

npm init --yes #  Abbreviation  -y

Add dependency

yarn add <package...> [--dev/-D] // No -D Default production environment  

yarn add [package]@[version] # With version  

npm install XXX --save  It can be abbreviated as npm i XXX -S -------->  Installation project dependency 

npm install XXX --save-dev It can be abbreviated as npm i XXX -D ------>  Installation development depends on 

Install global dependencies

yarn global add [package]

npm install [package] -g 

Remove dependency

yarn remove <packageName> 

npm uninstall <packageName> -S

Remove dependencies globally

yarn global remove <packageName>

npm uninstall -g <packageName> 

Upgrade dependency

yarn upgrade #  Upgrade all dependencies , Not recorded in  package.json  in  

npm update # npm  Can pass  ‘--save|--save-dev’  Specify which type of dependency to upgrade  

yarn upgrade webpack #  Upgrade the specified package  

npm update webpack --save-dev #

npm yarn upgrade --latest #  Ignore version rules , Upgrade to the latest version , And update  package.json

Run script

yarn run 

npm run

List all global dependencies

yarn global list --depth=0 #  Limit the depth of dependency 

npm list -g --depth=0

Clear cache

yarn cache clean

npm cache clean --force

npm and yarn Convert Taobao source and official source

npm config set registry http://registry.npm.taobao.org/
npm config set registry https://registry.npmjs.org/

yarn config set registry http://registry.npm.taobao.org/
yarn config set registry https://registry.npmjs.org/

npm Setting agent
 

npm config set proxy http://127.0.0.1:8080
npm config set https-proxy http://127.0.0.1:8080

yarn config set proxy http://127.0.0.1:8080
yarn config set https-proxy http://127.0.0.1:8080

npm Delete agent

npm config delete proxy
npm config delete https-proxy

yarn config delete proxy
yarn config delete https-proxy

Set offline image storage ：

yarn config set yarn-offline-mirror [MIRROR_DIRECTORY_PATH]
yarn config set yarn-offline-mirror-pruning true

The first configuration is the location of the offline image cache folder , Used to store downloaded TAR package . The second configuration is to help clean up all unlinked dependencies ( You can leave it blank ).

This setting will create ~/.yarnrc, If it is not set globally , Instead, only the current project needs to be set , You need to move the file to the current project directory ：

The method of testing offline status is as follows ( You need to turn off the wired or wireless network connection )：

yarn cache clean
yarn install -offline