yarnpkg/yarn

Allow install only devDependencies

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#3254 opened on Apr 25, 2017

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Description

Do you want to request a feature or report a bug? Hopefully this is a small feature request. I'd like a flag that allows me to only install devDependencies. This would allow me to split my flat installed client code from my build tools code.

Thanks to the fix in https://github.com/yarnpkg/yarn/issues/2781#issuecomment-296955569 I can now do:

yarn install --flat --production --modules-folder client_modules

And only install dependencies in my client_modules directory. This is awesome ❤️

If I also do yarn, it will install dependencies and devDependencies into my node_modules directory. But I already flat installed my dependencies into client_modules so installing them again in node_modules isn't necessary.

What is the current behavior? There's no way to only install devDependenices.

What is the expected behavior? A flag, maybe yarn install --dev-dependencies or something like that?

Contributor guide

Tech stack
javascriptnodejs
Domain
clitooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
yarn CLI basicsNode.js package.json
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The yarn 1.x line is frozen; the feature request might be implemented in the Yarn Berry (v2+) repository. In the current repository, the install logic is in the 'src/cli/commands/install.js' file. The discussion suggests adding a ' production' flag counterpart for devDependencies. Contributors should review the existing flags and the install function to understand how to add a new flag. However, due to the frozen status, this issue is not actionable in this repo.