Yarn installation and use tutorial [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

One 、 Official website guidelines

English official website ：Yarn English official website

Chinese document ：Yarn Chinese document

Two 、Yarn Introduce

Yarn yes Facebook, Google, Exponent and Tilde Developed a new JavaScript Package management tools . You can use code from developers all over the world , Or share your own code . The code passes through the package （package）（ Or module （module）） To share . A package contains all the code that needs to be shared , And files that describe package information , be called package.json. Its advantage is faster 、 More secure 、 More reliable . Its main features are offline mode 、 deterministic 、 network performance 、 Sign up more 、 Network resilience 、 Flat mode and Emoji.

3、 ... and 、Yarn The advantages of

Fast ：Yarn Cache every downloaded package , So you don't have to download it again when you use it again . At the same time, parallel downloads are used to maximize resource utilization , So it's faster to install .

reliable ： Use details 、 Simple lock file format and clear installation algorithm ,Yarn It can ensure no different work on different systems .

Security ： Before executing the code ,Yarn The integrity of each installation package will be verified through the algorithm .

Four 、window System installation Yarn

【1】 Download the installation package to install

Click me to download Yarn Installation package , You will download to a .msi file , When it runs, it will guide you to Yarn The installation to Windows On . If you use this installer , You need to install Node.js.

【2】 adopt Chocolatey install

Chocolatey It's a Windows Special software package management tools . Please follow this explain install Chocolatey . install Chocolatey after , You can execute the following commands on the console to install Yarn 了

choco install yarn

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【3】 adopt Scoop install

Scoop Is a Windows Command line based installation tool . Please follow this explain install Scoop .Scoop After installation , You can execute the following commands on the console to install Yarn 了

scoop install yarn

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5、 ... and 、Linux System installation Yarn

【1】 Execute the official website installation script with one click

curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --nightly

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【2】 adopt npm install

npm install -g yarn

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【3】 Check the version after installation

yarn --version

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6、 ... and 、Yarn Common commands

【1】 Initiate a new project

yarn init

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【2】 Add dependency package

yarn add [package] //  The latest version will be automatically installed , Will overwrite the specified version number 
yarn add [package] [package] [package] //  Add multiple packages at once 
yarn add [package]@[version] //  Add the specified version of the package 
yarn add [package]@[tag] //  Install a tag（ such as beta,next perhaps latest）

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【3】 Add dependencies to different dependency categories

Do not specify a dependency type. Install to by default dependencies in , You can also specify dependency types to be added to devDependencies、peerDependencies and optionalDependencies

yarn add [package] --dev  or  yarn add [package] -D //  Add to  devDependencies
yarn add [package] --peer  or  yarn add [package] -P //  Add to  peerDependencies
yarn add [package] --optional  or  yarn add [package] -O //  Add to  optionalDependencies

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【4】 Upgrade dependency package

yarn upgrade [package] //  Upgrade to the latest version 
yarn upgrade [package]@[version] //  Upgrade to the specified version 
yarn upgrade [package]@[tag] //  Upgrade to specified tag

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【5】 Remove dependency package

yarn remove [package] //  Remove package 

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【6】 install package.json Package dependency in , And save the package and all its dependencies into yarn.lock

yarn  or  yarn install //  Install all dependencies 
yarn install --flat //  Install a single version of a package 
yarn install --force //  Force all packages to be downloaded again 
yarn install --production //  Only install production environment dependencies 

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【7】 Release package

yarn publish

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【8】 Run script

yarn run //  Used to perform the  package.json  in  scripts  Property 

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【9】 Show information about a package

yarn info [package] //  It can be used to view the latest version information of a module 

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【10】 cache

yarn cache
yarn cache list //  List each package that has been cached 
yarn cache dir //  Returns the global cache location 
yarn cache clean //  Clear cache 

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7、 ... and 、yarn and npm Command comparison

NPM	Yarn	explain
npm init	yarn init	Initialize a project
npm install/link	yarn install/link	The default installation depends on
npm install taco –save	yarn add taco	Install a dependency and save it to by default package
npm uninstall taco –save	yarn remove taco	Remove a dependency
npm install taco –save -dev	yarn add taco -dev	Install a development dependency
npm update taco –save	yarn upgrade taco	Update a dependent project
npm install taco –global	yarn global add taco	Install a global dependency project
npm publish/login/logout	yarn publish/login/logout	Release / Sign in / sign out
npm run/test	yarn run/test	Run a command

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