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Lerna
Lerna

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Yarn

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Lerna vs Yarn: What are the differences?

Lerna: A tool for managing JavaScript projects. It is a popular and widely used package written in JavaScript. It optimizes the workflow around managing multi-package repositories with git and npm; Yarn: A new package manager for JavaScript. Yarn caches every package it downloads so it never needs to again. It also parallelizes operations to maximize resource utilization so install times are faster than ever.

Lerna belongs to "Javascript Utilities & Libraries" category of the tech stack, while Yarn can be primarily classified under "Front End Package Manager".

Lerna and Yarn are both open source tools. Yarn with 36.2K GitHub stars and 2.22K forks on GitHub appears to be more popular than Lerna with 17.6K GitHub stars and 1.11K GitHub forks.

What is Lerna?

It is a popular and widely used package written in JavaScript. It optimizes the workflow around managing multi-package repositories with git and npm.

What is Yarn?

Yarn caches every package it downloads so it never needs to again. It also parallelizes operations to maximize resource utilization so install times are faster than ever.
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      What are some alternatives to Lerna and Yarn?
      Apache Maven
      Maven allows a project to build using its project object model (POM) and a set of plugins that are shared by all projects using Maven, providing a uniform build system. Once you familiarize yourself with how one Maven project builds you automatically know how all Maven projects build saving you immense amounts of time when trying to navigate many projects.
      Bit
      It is open source tool that helps you easily publish and manage reusable components. It help teams scale shared components to hundreds and even thousands of components, while eliminating the overhead around this process.
      Builder
      It is the first and only headless CMS with full drag and drop editing. It supports many frameworks like Angular, Vue, React, Preact etc.
      Modernizr
      It’s a collection of superfast tests or detects as we like to call them which run as your web page loads, then you can use the results to tailor the experience to the user. It tells you what HTML, CSS and JavaScript features the user’s browser has to offer.
      Modernizr
      It’s a collection of superfast tests or detects as we like to call them which run as your web page loads, then you can use the results to tailor the experience to the user. It tells you what HTML, CSS and JavaScript features the user’s browser has to offer.
      See all alternatives
      Decisions about Lerna and Yarn
      Tim Abbott
      Tim Abbott
      Founder at Zulip · | 5 upvotes · 19.2K views
      atZulipZulip
      Yarn
      Yarn
      npm
      npm
      Node.js
      Node.js

      I have mixed feelings on the Yarn/npm/Node.js ecosystem. We use it for Zulip, because you basically have to in order to have a modern JavaScript toolchain. And I like that Yarn lets us pin dependency versions out of the box for predictability in our production releases; we have to do significant work for the Python version of this feature.

      But one also deals with broken third-party dependencies uploaded to npm way too often (even ignoring the malicious packages issues that have gotten a lot of press of late). And one mostly has to use nvm in order to pin a specific version of node itself in a maintainable way, and nvm is a mess.

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      Russel Werner
      Russel Werner
      Lead Engineer at StackShare · | 5 upvotes · 10.7K views
      atStackShareStackShare
      Yarn
      Yarn
      npm
      npm

      We use Yarn because at the time we decided to adopt it, npm had some missing features and issues. We like the speed and determinism provided by Yarn. We could probably use npm at this point, but we have no real reason to switch from Yarn. If you have a convincing argument to switch from npm to Yarn please leave a comment on this decision!

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      Johnny Bell
      Johnny Bell
      Senior Software Engineer at StackShare · | 17 upvotes · 660K views
      Webpack
      Webpack
      Node.js
      Node.js
      Yarn
      Yarn
      npm
      npm
      Babel
      Babel
      Prettier
      Prettier
      ESLint
      ESLint
      #ES6
      #ES5

      So when starting a new project you generally have your go to tools to get your site up and running locally, and some scripts to build out a production version of your site. Create React App is great for that, however for my projects I feel as though there is to much bloat in Create React App and if I use it, then I'm tied to React, which I love but if I want to switch it up to Vue or something I want that flexibility.

      So to start everything up and running I clone my personal Webpack boilerplate - This is still in Webpack 3, and does need some updating but gets the job done for now. So given the name of the repo you may have guessed that yes I am using Webpack as my bundler I use Webpack because it is so powerful, and even though it has a steep learning curve once you get it, its amazing.

      The next thing I do is make sure my machine has Node.js configured and the right version installed then run Yarn. I decided to use Yarn because when I was building out this project npm had some shortcomings such as no .lock file. I could probably move from Yarn to npm but I don't really see any point really.

      I use Babel to transpile all of my #ES6 to #ES5 so the browser can read it, I love Babel and to be honest haven't looked up any other transpilers because Babel is amazing.

      Finally when developing I have Prettier setup to make sure all my code is clean and uniform across all my JS files, and ESLint to make sure I catch any errors or code that could be optimized.

      I'm really happy with this stack for my local env setup, and I'll probably stick with it for a while.

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      Yarn
      Yarn

      p.s.

      I am not sure about the performance of the latest version of npm, whether it is different from my understanding of it below. Because I use npm very rarely when I had the following knowledge.

      ------⏬

      I use Yarn because, first, yarn is the first tool to lock the version. Second, although npm also supports the lock version, when you use npm to lock the version, and then use package-lock.json on other systems, package-lock.json Will be modified. You understand what I mean, when you deploy projects based on Git...

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      Mark Nelissen
      Mark Nelissen
      CTO at Gemsotec bvba · | 4 upvotes · 2.9K views
      React
      React
      TypeScript
      TypeScript
      Yarn
      Yarn
      npm
      npm

      I use npm because I also mainly use React and TypeScript. Since several typings (from DefinitelyTyped) depend on the React typings, Yarn tends to mess up which leads to duplicate libraries present (different versions of the same type definition), which hinders the Typescript compiler. Npm always resolves to a single version per transitive dependency. At least that's my experience with both.

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      Jason Barry
      Jason Barry
      Cofounder at FeaturePeek · | 4 upvotes · 21.2K views
      atFeaturePeekFeaturePeek
      Flow (JS)
      Flow (JS)
      TypeScript
      TypeScript
      React
      React
      JavaScript
      JavaScript
      Sublime Text
      Sublime Text
      Babel
      Babel
      Yarn
      Yarn
      npm
      npm
      #Frontend

      I think our #Frontend stack is pretty standard – but we have taken some deviations from a typical modern stack:

      • Flow (JS) instead of TypeScript. Flow was an easy choice 2+ years ago, as both flow and React were (and still are) maintained by Facebook. Today, it seems that the JavaScript community has settled on TypeScript as the winner. For new projects, I'd choose TS, but I don't see the point in migrating an existing project from flowtype to TS, when the end result will be roughly the same. Sure, memory usage is a bit high, and every now and then I have to kill some zombie processes, but our text editors (Sublime Text), CI scripts, and Babel are already set up to take advantage of the type safety that flow offers. When/if the React team writes React itself in TS, then I'll take a closer look – until then, flow works for us.

      • Yarn instead of npm. When yarn debuted, we never looked back. Now npm has pretty much caught up with speed and lockfiles, but yarn gives me confidence that my dependency installs are deterministic. Really interested in the plug-n-play (PnP) feature that removes the need for a node_modules folder, but haven't implemented this yet.

      See more
      StackShare Editors
      StackShare Editors
      Node.js
      Node.js
      npm
      npm
      Yarn
      Yarn

      From a StackShare Community member: “I’m a freelance web developer (I mostly use Node.js) and for future projects I’m debating between npm or Yarn as my default package manager. I’m a minimalist so I hate installing software if I don’t need to- in this case that would be Yarn. For those who made the switch from npm to Yarn, what benefits have you noticed? For those who stuck with npm, are you happy you with it?"

      See more
      Interest over time
      Reviews of Lerna and Yarn
      No reviews found
      How developers use Lerna and Yarn
      Avatar of Mick Dekkers
      Mick Dekkers uses YarnYarn

      Yarn is a wonderful alternative to the built-in npm command-line interface. Dependency installation is crazy fast, because it caches every package and performs operations in parallel.

      Avatar of Volkan Özçelik
      Volkan Özçelik uses YarnYarn

      I prefer yarn instead of npm.

      Both npm and yarn work great.

      I don’t see any overwhelming reason to choose one over another.

      I just like yarn, that’s it.

      Avatar of Ambar
      Ambar uses YarnYarn

      We use it in every JS project. Blazing fast package manager for node.js. Easy to use in Docker containers

      Avatar of Coolfront Technologies
      Coolfront Technologies uses YarnYarn

      Used in Coolfront Mobile and "Charlie" (flat rate search engine) as packaging mechanism.

      Avatar of IVS
      IVS uses YarnYarn

      We tend to stick to npm, yarn is only a fancy alternative, not 10x better.

      How much does Lerna cost?
      How much does Yarn cost?
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