For a few days I have been getting these messages:
*> yarn run v1.21.1 $ react-scripts start
There might be a problem with the project dependency tree. It is
likely not a bug in Create React App, but something you need to fix
locally.
The react-scripts package provided by Create React App requires a
dependency:
"eslint": "^6.6.0"
Don't try to install it manually: your package manager does it
automatically. However, a different version of eslint was detected
higher up in the tree:
/home/sol/Repository/node_modules/eslint (version: 6.3.0)
Manually installing incompatible versions is known to cause
hard-to-debug issues.
If you would prefer to ignore this check, add
SKIP_PREFLIGHT_CHECK=true to an .env file in your project. That will
permanently disable this message but you might encounter other issues.
To fix the dependency tree, try following the steps below in the exact
order:
Delete package-lock.json (not package.json!) and/or yarn.lock in your project folder.
Delete node_modules in your project folder.
Remove "eslint" from dependencies and/or devDependencies in the package.json file in your project folder.
Run npm install or yarn, depending on the package manager you use.
In most cases, this should be enough to fix the problem. If this has
not helped, there are a few other things you can try:
If you used npm, install yarn (http://yarnpkg.com/) and repeat the above steps with it instead.
This may help because npm has known issues with package hoisting which may get resolved in future versions.
Check if /home/sol/Repository/node_modules/eslint is outside your project directory.
For example, you might have accidentally installed something in your home folder.
Try running npm ls eslint in your project folder.
This will tell you which other package (apart from the expected react-scripts) installed eslint.
If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file
in your project. That would permanently disable this preflight check
in case you want to proceed anyway.
P.S. We know this message is long but please read the steps above :-)
We hope you find them helpful!
error Command failed with exit code 1. info Visit
https://yarnpkg.com/en/docs/cli/run for documentation about this
command.*
I tried everything above, but nothing helps and I'm really upset about this situation because I can't get my code to work.
Can someone help me with easy instructions because I don't have time anymore to try and find a solution to the problem.
I could not solve the problem:
There might be a problem with the project dependency tree.
It is likely not a bug in Create React App, but something you need to fix locally.
The react-scripts package provided by Create React App requires a dependency:
"eslint": "^6.6.0"
Don't try to install it manually: your package manager does it automatically.
However, a different version of eslint was detected higher up in the tree:
/Users/elvestrindade/node_modules/eslint (version: 6.2.2)
Related
I used the CLI to install React Native, Node and Python but was not aware if I needed to save it to a file first.
I ran the yarn command:
➜ ~yarn add <package>
I would get this warning message when running yarn check:
➜ ~ yarn check
warning package.json: No license field
warning No license field
warning "jest-haste-map#fsevents#node-pre-gyp#^0.12.0" could be deduped from "0.12.0" to "node-pre-gyp#0.12.0"
Questions:
1. Do I only ~ yarn add when I start a project?
2. Since I've installed python, node, and react-native without creating a project folder will I run into issues down the road?
3. Do I add the json file with the licenses manually when starting a project with yarn?
4. Am I hopeless? lol
I've tried uninstalling and reinstalling from yarn and updating yarn. Also, I've tried installing python and node from Homebrew to see if that changes anything.
Below is a log of the output from the CLI after running ~ yarn check
Last login: Sat Aug 24 02:21:38 on ttys001
➜ ~ yarn check
yarn check v1.17.3
warning package.json: No license field
warning No license field
warning "jest-haste-map#fsevents#node-pre-gyp#^0.12.0" could be deduped from "0.12.0" to "node-pre-gyp#0.12.0"
success Folder in sync.
✨ Done in 1.99s.
Solution I figured it out! So after poking around I realized that once I started a project I had a yarn.lock and package.json file one level up in the directory where the file was located. What I did was I deleted yarn.lock and package.json associated with the folder in the directory. After that was complete I then went into my project and installed the correct packages.
You're not hopeless. This project may be, you've bitten off waaaay more than you can chew yet.
To answer your main question:
yarn add and it's cousin npm install will install the thing you tell them to in the node_modules folder in the directory you run the command in. The reason it's yelling at you is because usually you'll want to save the thing you installed as a dependency of your project, and you can't do that without a package.json file. You should run npm init to set up the package.json file for your project, then running yarn add will actually save it to the dependencies list so that you have a reproducible. If you have a package.json file already, it sounds like you maybe created it by hand (since it's missing a license field?) rather than have npm set it up for you, which is a bad idea.
Two more things:
React Native is awesome! ...But, it's a tool for people who already have good familiarity with Javascript command line/tooling/ecosystem/coding/React to build mobile apps. It is a lousy choice for a first project if you're just getting started with programming. Building a webpage with React is a lot easier, but even that may be too much.
If you really want to build a React Native app and you just can't wait look at this to get started.
But seriously, learn Javascript then npm then yarn then React then React Native. In that order.
When editing javascript files in Sublime Text Editor 3.x, I get the error:
Oops! Something went wrong! :(
ESLint: 6.0.1.
ESLint couldn't find the plugin "eslint-plugin-chai-expect".
(The package "eslint-plugin-chai-expect" was not found when loaded as a Node module from the directory "C:\workspace\flltools".)
It's likely that the plugin isn't installed correctly. Try reinstalling by running the following:
npm install eslint-plugin-chai-expect#latest --save-dev
The plugin "eslint-plugin-chai-expect" was referenced from the config file in "modules\scoring\.eslintrc.yml".
If you still can't figure out the problem, please stop by https://gitter.im/eslint/eslint to chat with the team.
I tried multiple solutions I found online, including removing global ESLint/moving all ESLint related packages to be global, to altering the SublimeLinter.settings file. The problem only occours when running lint through Sublime. When I run eslint command, it works perfectly.
If anyone has any idea why this is happenning please help me!
Thank you
As far as I can tell this is indeed a problem with migrating to ESLint v6. But it's not a global installation problem.
The problem is now that ESLint looks in the working directory where the eslint command is run from. As you say in your comment:
It seems to be looking in a parent folder (as you can see in the error it's looking in c:/workspace/flltools, whereas my project is in c:/workspace/flltools/modules/scoring
So your editor is running eslint in the parent directory rather than in the directory where the package.json file is. I'm guessing your editor has the project root one level higher than where the package.json file is.
It does look like this has now been patched in the SublimeLinter plugin via github issue #1626: Wrong working directory on nested local eslint installs (breaks eslint#6)
Note that I have similar issues with both VSCode and Vim, so it's not a specifically a Sublime Text thing, more just an ESLint thing.
In the ESLint v6 migration doc, it has a section on "Plugins and shareable configs are no longer affected by ESLint’s location". It suggests:
If you use a config file located outside of a local project (with the --config flag), consider installing the plugins as dependencies of that config file, and setting the --resolve-plugins-relative-to flag to the location of the config file.
This --resolve-plugins-relative-to will fix the problem in that you can specify the path to where the package.json is inside there.
Most probably you have updated your ESLint to v6.
As per Migrating to 6.0 Docs
If you use a global installation of ESLint (e.g. installed with npm install eslint --global) along with plugins.
Then you should install those plugins locally in the projects where you run ESLint.
In your case, Install eslint-plugin-chai-expect and other plugins(if used) as devDependencies locally to your project.
npm install --save-dev eslint-plugin-chai-expect
If your config file extends shareable configs and/or parsers, you should ensure that those packages are installed as dependencies of the project containing the config file.
I am learning about angular universal. At this step :
ng add #nguniversal/express-engine --clientProject angular.io-example
It is supposed to add some files namely : main.server.ts, but it is not doing anything. I tried the same command with sudo too. What is the problem?
FYI, I started off with a clean project so there indeed were dependencies missing, your case might be a bit different, depending on whether you already have some of the dependencies already installed.
Since it was doing the same for me too as mentioned, I went ahead and used
npm i #nguniversal/express-engine
which showed me some warnings about some dependencies which were missing.
In my case they were,
npm install ajv-keywords
and
npm install #angular/platform-server
then I ran
npm install #nguniversal/express-engine
to install the package, then
ng add #nguniversal/express-engine
which added the necessary dependencies you were asking for. Hope this is easy to follow
I have been using npm for a personal project and just recently stumbled across yarn. Would there be any harm or "intended side effects" to switching to yarn's package manager in the same project where I had been using npm?
Although a few commenters here say its ok to mix both yarn and npm on the same project, after using yarn and npm and then yarn again, this is what yarn has to say about it:
warning package-lock.json found. Your project contains lock files generated by tools
other than Yarn. It is advised not to mix package managers in order to avoid resolution
inconsistencies caused by unsynchronized lock files. To clear this warning, remove
package-lock.json.
Since to me it is not any harm to using both them into one project.
I use npm and yarn (50/50) in dev environment.
But on ci/di i use only yarn because it is faster, and i reduce build minutes thanks yarn.
Also they both create different .lock file names.
Nobody told about the lock files.
Imagine you use yarn on dev environment, and yarn on your build/production servers. When you install a package using yarn, and your project works on your computer, you probably would want to keep it working on a production environment (your server).
That being sad, you would commit you yarn.lock file, that "saves" the exact versions of each package you have, when the project ran on your computer.
On your buid/production server you should call yarn install, but asking to keep all the same versions with --frozen-lockfile parameter. Some even say "yarn install --frozen-lockfile should be the default behavior", and I agree.
Then... another dev jump in the project you are working and install a package using npm (other than yarn). That new package will not be included in your yarn.lock file, but, a new package-json.lock file would be created, telling the exact packages versions it is using.
When that commit arrives on your build/production server, it will crash, fail, because that new package doesn't exist on yarn.lock file. Someone would need to pull that changes, call a yarn to install the dependences and update the lock file with the new package dependences, and push it again to the repo.
A quick point about using the lock file or not. If you call a 'yarn install' on your build/production server some weeks after the last install on your machine, the server would have many other new versions than your last "stable" version. It already happened to me many times.
I published recently the package-locks-checks, which help ensure you have not just one lock file but also locked each package version on your project.
There will be a point that one or both will no longer work and your project will be stuck at only using the existing lock file. Meaning, the issue probably will involve installation fails if you opt to reinstall without a lock file. And that also means failure to create a new lock file, so you are stuck with the existing one that you are trying to get rid off in the first place. We are actually encountering this issue in one of our projects. Because it is so big, no one tries to fix the issue and just rely on the existing lock file.
So, even if we say it's a rare case that it won't cause harm. Mixing npm and yarn should be avoided.
Here https://classic.yarnpkg.com/en/docs/migrating-from-npm/ we may find a confirmation that Yarn's resolution algorithm is compatible with NPM resolution algorithm.
Inside a npm project (with package.json) if you run yarn it will read your node_modules folder (using the resolution algorithm) and create a yarn.lock file with your project's locked dependency tree.
Based on that I assume that they are compatible inside the same project.
Update 30/04/2021
My original reply refers to yarn 1 (classic), although I've just created a React app with create-react-app tool and it creates the project's repository with package.json + yarn.lock by default. Again, another demonstration that it's fine (even with the warning mentioned by Dave Pile).
At the end of the day this is a matter of putting both together to work and checking yourself...
Plus you get a warning from yarn as Dave Pile said because we have to push *-lock.json files changes you have to consider using npm version >= 7 to make sure whenever you install packages by npm it will update your yarn-lock.json file too.
Because whenever you install the packages either by npm or yarn depends on what you have chosen for updating a dependency in the package.json (Using tilde ( ~ ) which gives you bug fix releases and caret ( ^ ) gives you backward-compatible new functionality) it will update you.lock file and since you have to push it might happen that you have different version of lock files.
I've got these plug-ins in my project
babel-traverse
babel-types
babylon
How do I update these to the latest?
Including typescript plugin.
In my node_modules folder - i've got a bunch of entries that I did not install
adm-zip
inflight
minimatch
lazy
mkdirp
and others - anyone how how it got there?
Running npm outdated shows outdated packages. npm update updates packages. And you need to check the versions listed in package.json to see if they're locked at specific version or if you allow minor/major bumps when running install. There are hundreds of tutorials on using npm and understanding the package.json. those packages you mention, I wouldn't mess with too much. those are added by nativescript to make things work in a sense. So they're dependencies for nativescript they don't actually get packaged with your app (I don't believe, haven't checked that in a build to be certain).