Yarn Install Dev

Posted : admin | On 10-05-2021

  1. Similar to npm install, yarn add allows you to add and install a dependency. As the name of the command implies, it adds a dependency, meaning it automatically saves a reference to the package in the package.json file, just as npm’s --save flag does.
  2. Is it possible to install devDependencies and dependencies together with yarn? For exmaple, if I want to install react and webpack.React is a dependency and webpack is a dev dependency. To install both, I need to run these two commands.
  3. Using Yarn with Docker. Facebook recently released Yarn, a new Node.js package manager built on top of the npm registry, massively reducing install times and shipping a deterministic build out of the box. Determinism has always been a problem with npm, and solutions like npm shrinkwrap are not working well.This makes hard to use a npm-based system for multiple developers and on continuous.
  1. Yarn Install Dev
  2. Yarn Save Dev
  3. Yarn Add To Dev
  4. Yarn Dev Dependency
  5. Yarn Install Globally

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Why Developers Are Moving to Yarn. Share on Share on Twitter Share on Facebook Share on Reddit Share on Hacker News. With the release of Npm@5 and NodeJS V8, some of the information below is out of date. Npm install --save-dev [package] yarn add [package] [--dev/-D].

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Comments

commented Feb 21, 2017

Current behavior
Currently, when NODE_ENV=production, yarn will only install dependencies and not devDependencies. This behavior mirrors npm, but isn't reflected anywhere in yarn's documentation. and there's no flag to force yarn to all dependencies. The ability to force all dependencies to be installed is useful to me for ci testing. My current workaround is to use NODE_ENV=development yarn.

Proposed solutions

  1. Add a flag which forces all dependencies to be installed yarn install --all (?)
  2. Update the documentation to reflect this shortcoming.

I'm happy to do either or both if pull requests are welcome.

node.js, yarn and operating system version.

  • node v7.5.0
  • yarn v0.20.3
  • Mac OS and Ubuntu 14.04

commented Feb 22, 2017•
edited

I don't think this is a bug. As you mentioned, npm has exactly the same behavior when you set NODE_ENV=production. I don't see why NODE_ENV=production should not only install production dependencies.

As a side note: if you rely on packages from devDependencies in a production environment, it sounds like these shouldn't be dev dependencies at all?

commented Feb 22, 2017

@LINKIWI I've got weird ci configurations that probably need to be refactored. Here's one of them where I run tests (which rely on dev dependencies) with my application in production mode.

Would either of my suggestions be welcome? Or if this is something that you believe only I experience, I'll happily close the issue.

commented Feb 23, 2017

@mldangelo You can install the dev dependencies in NODE_ENV=production with yarn install --production=false

commented Apr 30, 2017

Good to know about --production=false. I think that should be documented too.

I needed this feature too for CI because I need all the packages to build my project, but webpack (and the react library in particular) should have NODE_ENV=production to create a smaller bundle. After the bundle is built, I actually don't need any node_modules at all in production.

commented Jul 24, 2017

FYI, I seem to have experienced the opposite behaviour in yarn 0.27.5. When NODE_ENV=production is set, yarn is still installing devDependencies, while npm@5.3.0 is not.

commented Aug 22, 2017

commented Aug 22, 2017

As mentioned in other comments, this is the intended behavior. The documentation for the --production=false flag to override it is here: https://yarnpkg.com/en/docs/cli/install#toc-yarn-install-production

yarn install --production[=true|false]
Yarn will not install any package listed in devDependencies if the NODE_ENV environment variable is set to production. Use this flag to instruct Yarn to ignore NODE_ENV and take its production-or-not status from this flag instead.

I'm going to mark this issue 'closed' for now, but if you feel there is more to it that needs resolved, let us know and we can re-open it.

Closed

commented Jun 7, 2018•
edited

I'm using NODE_ENV=production to produce a 'production' build in a CI/CD (docker) environment, so... I need devDependencies installed to produce the build.
I think, this npm/yarn behavior is not clear at all.

commented Jun 12, 2018

@sir-gon I'm about to help a colleague resolve this same situation. I think I grok the yarn docs cited above; all that should be required is to do NODE_ENV=production yarn install --production=false, so node/webpack/etc do their thing for production, but yarn installs everything including devDependencies.

Tangent: seems to me with both yarn and npm there's insufficient distinction between 'dependencies needed to build the software' and 'dependencies needed at runtime'.

Yarn Install Dev

commented Dec 10, 2018

I faced the same issue and thank for you explanations. Here is how I circumvent this under Docker environment https://stackoverflow.com/questions/31889867/docker-compose-not-overriding-dockerfile-environment-variables#answer-53705415

commented Mar 18, 2019

Thank goodness for this thread.

commented Mar 21, 2019

Same issue. Good to know. Thanks.

Yarn Save Dev

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I recently assisted migration on a project from npm to Yarn, and it was as easy as typing yarn into the terminal.
Yarn is package management tool that creates modules (blocks of code from other developers that you load into your program) through terminal commands, very similar to the way you would with npm (Node.js package manager). It does this by using a lockfile to ensure that all libraries match across users (a common complaint from the npm client user is that multiple versions of dependencies can exist between users, and accountability goes down, resulting in a 'works on my machine' attitude). So with Yarn, you always know you're getting the same thing on every development machine.

You can migrate from npm to yarn by navigating to your project folder in the terminal and using the following comparison chart to customize the package you are working to build.

Flat mode is a unique feature that resolves mismatching versions of dependencies, creating a single version-this can help with code cleanup and deletion of duplicates.

Yarn Add To Dev

The above set of commands will install/add dependencies and create a .lock file based on the customizations you choose.

The remove package command can be useful. If you are working in an environment that has multiple package management tools running, you will be in pain. Try to stick to one.

Yarn Dev Dependency

Yarn's lockfile system creates a local cached copy that facilitates offline package installs. This is helpful because you can install your npm packages without an internet connection. In Yarn, your tests will pass even when npm goes down!

Yarn Install Globally

These are just a few basic concepts of the Yarn system. For full documentation, visit the Yarn CLI docs. While you may try Yarn and find it's not the best fit, it is a great tool that helps drive innovation. As always, I welcome questions, feedback and room for improvement. Thanks for reading!