Why give up NPM and turn to yarn

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Preface

yarn and npm Are excellent package management tools , Redesigned npm client yarn, There is no doubt that is npm plus edition , It solves the problem that developers use npm Pain points encountered during

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One 、yarn What is it? ？

yarn Is a new generation of package management tools , The tool is made up of Facebook and Goole Wait for the company to 2016 Jointly launched in .yarn There's a significant increase in speed , Less installation time , There are also many improvements in function

Two 、 Installation steps

1. Import and stock in

The code is as follows （ Example ）：

npm install -g yarn

2.npm disadvantages

• Slow download speed : because npm The plug-ins are downloaded from foreign servers , It is far less fast than downloading from domestic servers , To solve this pain , Taobao team made the domestic version npm be called cnpm , And right npm Mirrored , We only need to install globally cnpm , also registry become Taobao image file , This wave of operation has greatly solved the problem of download speed

npm install -g cnpm --registry=https://registry.npm.taobao.org

• The same project , The installed cannot be consistent . The reason is because package.json The characteristics of the version number in the document lead to , The following three version numbers represent different meanings during installation .

"1.0.1"     #  Indicates the installation of the specified 1.0.1 edition 
"~1.0.1"    #  Said the installation 1.0.X The latest version of 
"^1.0.1"    #  Said the installation 1.X.X The latest version of 

3.yarn advantage

• The download speed of the bottom layer

npm It is serially executed according to the queue package, and yarn Perform all tasks synchronously in parallel , The performance has been greatly improved .

• Unified version installation

yarn Medium lock file Specifically record the version number of the installed module . Just add one module at a time ,yarn It will update yarn.lock
This file . This ensures that every time you pull the same project dependency , The same module version is used .

• Concise output

npm In execution npm install When , The command line will continuously print out all installed dependencies , A lot of useless redundant information , and yarn During the installation process, only the necessary information will be printed

3、 ... and 、yarn Command changes

• registry Mirror image

npm install -g cnpm --registry=http://registry.npm.taobao.org

yarn config set registry 'https://registry.npm.taobao.org'     

• Initialize a project

npm init

yarn init                                              

• The installation project depends on

npm install

yarn install      

• Install third party dependencies

npm install <package>

yarn add <package>

• Remove dependency

npm uninstall <package>

yarn remove <package>

• Update dependency

npm update <package>

yarn upgrade <package>

• Install global project dependencies

npm install <package>-g

yarn global add <package>

• Install project dependencies for a specific version number

npm install <package>@1.2.33

yarn add <package>@1.2.33    

• Contract awarding / Sign in / Logout operation

npm publish/login/logout

yarn publish/login/logout     

• Run the command

yarn run/test      

summary

for example ： That's what we're going to talk about today , This article only briefly introduces yarn and npm The use of commands and yarn The advantages of