Yarn run lint

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Yarn run lint

Next, add an. Here is a sample configuration for a TypeScript project:. If using TypeScript with React, the eslint-plugin-react dev dependency should be installed and the following configuration can be used:. Ultimately it's up to you to decide what rules you would like to extend from and which ones to use within the rules object in your. What works well along with ESLint is prettierwhich does a great job at handling code formatting. Install the required dev dependencies to get prettier working with ESLint:.

In order to configure prettier, a. Here is a sample. Next, the. The advantage of having prettier setup as an ESLint rule using eslint-plugin-prettier is that code can automatically be fixed using ESLint's --fix option. For a good developer experience, it's useful to setup your editor to automatically run ESLint's automatic fix command i. Since i'm using VS Code, here is the config required in the settings.

If you've also set the editor. A useful command to add to the package. The above script can be run from the command line using npm run lint or yarn lint. This command will first run the TypeScript compiler and report any TypeScript compiler errors. Any ESLint errors that can be automatically fixed will be fixed with this command, but any other errors will be printed out in the command line.

To ensure all files committed to git don't have any TypeScript, linting, or formatting errors, there is a tool called lint-staged that can be used.

Getting Started

When lint-staged is used in combination with huskythe linting commands specified with lint-staged can be executed to staged files on pre-commit if unfamiliar with git hooks, read about them here. To configure lint-staged and huskyadd the following configuration to the package.

The above configuration will run lint-staged when a user tries to commit code to git. Any errors that can be fixed automatically will be fixed and added to the current commit.

However, if there are any linting errors that cannot be fixed automatically, the commit will fail and the errors will need to be manually fixed before trying to commit the code again. Personally, I also like to prevent any commits that would cause the TypeScript compiler to fail, therefore I like to add a check on pre-commit that also checks for TypeScript errors. The husky configuration can be modified to do so:. Unfortunately it is not enough to only rely on lint-staged and husky to prevent linting errors and TypeScript compiler errors since the git hooks can be by-passed if a user commits uses the --no-verify flag.

Therefore, it is also recommended to run a command on a continuous integration CI server that will verify that the TypeScript compiler doesn't fail and that there are no linting errors. That command should look like the following:. Notice the above command doesn't pass the --fix command to the eslint CLI since we want the command to fail if there are any sort of errors.

yarn run lint

We do not want to CI automatically fixing lint errors since that would indicate that there is code that does not pass the linting checks that has been committed to git.

Sign up to my newsletter to stay up to date with my latest articles and news. Robert Cooper blog projects. Note: If using create-react-app to bootstrap a project, eslint is already included as a dependency through react-scriptsand therefore it is not necessary to explicitly install it with yarn.

Note: I prefer using a JavaScript file for the. This will display prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.Create React App is an officially supported way to create single-page React applications. It offers a modern build setup with no configuration.

If you've previously installed create-react-app globally via npm install -g create-react-appwe recommend you uninstall the package using npm uninstall -g create-react-app to ensure that npx always uses the latest version.

They are preconfigured and hidden so that you can focus on the code. You can now optionally start a new app from a template by appending --template [template-name] to the creation command. Templates are always named in the format cra-template-[template-name]however you only need to provide the [template-name] to the creation command.

Our Custom Templates documentation describes how you can build your own template. You can start a new TypeScript app using templates. To use our provided TypeScript template, append --template typescript to the creation command. If you already have a project and would like to add TypeScript, see our Adding TypeScript documentation. When you create a new app, the CLI will use Yarn to install dependencies when available.

If you have Yarn installed, but would prefer to use npm, you can append --use-npm to the creation command.

yarn run lint

For example:. Running any of these commands will create a directory called my-app inside the current folder. Inside that directory, it will generate the initial project structure and install the transitive dependencies:. No configuration or complicated folder structures, only the files you need to build your app. Once the installation is done, you can open your project folder:. Runs the app in development mode.

The page will automatically reload if you make changes to the code. You will see the build errors and lint warnings in the console. Runs the test watcher in an interactive mode. By default, runs tests related to files changed since the last commit.

Builds the app for production to the build folder. It correctly bundles React in production mode and optimizes the build for the best performance.

Docs Help GitHub. Create React App.

Getting Started with ESLint

Quick Start npx create-react-app my-app. Edit this page. Quick Start Get Started Immediately Creating an App npx npm Yarn Selecting a template Selecting a package manager Output Scripts npm start or yarn start npm test or yarn test npm run build or yarn build.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I run the nodejs app with yarn run startwhat is the command for pm2 I should use? Learn more. Ask Question. Asked 4 months ago. Active 4 months ago. Viewed times. My package. Vaz 3 3 silver badges 12 12 bronze badges. Active Oldest Votes.

The error you're getting is because a bash script yarn is being executed with node Because pm2's default interpreter is set to node.

To run yarn you'll have to set the interpreter to bash: shell: Try the command below: pm2 start yarn --interpreter bash --name api -- start. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta.

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Simply put, a linter is a tool that programmatically scans your code with the goal of finding issues that can lead to bugs or inconsistencies with code health and style. Some can even help fix them for you!

Most things you can think of probably already exist in one form or anotherand if not, you can even create custom rules that fit your needs! Probably the biggest overlying theme of the list above is the fact that these issues will be called out immediately.

No longer will these issues creep up on you in the middle of running your app or give someone anxiety during a code review. All of those moments that stop you from being productive because of a silly syntax error or the micro-interactions you and your teammates have during a review take time.

They add up and end up taking away the time you can spend fixing another bug or developing the next great feature of your product. The same principles apply, but the tooling may be a bit different. To get started, we first need a linter. Probably the most popular in the Javascript world is ESLint. Your linter will actually be the engine for defining rules and parsing your files to test against.

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ESLint is available as an npm package by itself and once installedout of the box it allows you to set up a basic configuration file and hit the ground running with some command line tools.

If you're working with a large project with many file types, maybe even some you don't want linted, you can change that flag or be more specific with other options. A common tool in the chain for Javascript developers is Babelwhich allows you to write code with features that may not be supported in all browsers, such as using arrow functionsthat are available in ES6and other conventions like importing files via import. This helps ESLint know how to run your code.

Additionally, we want to set up our parser to be babel-eslint. Writing a React app? The Babel parser may help you transform your code, but you might have a hard time being productive, as ESLint needs to understand how it should work to lint your React files. Part of the beauty of ESLint is that it allows you to configure plugins that have the opportunity to create and set rules for you.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The terminal returns this error: [Errno 2] No such file or directory: 'run'.

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Question feed. Stack Overflow works best with JavaScript enabled.Contributions are always welcome, no matter how large or small. Before contributing, please read the code of conduct. We label issues that we need help with the help wanted tag.

We also categorize them with the following tags:. These are the main categories that you can work on. We further mark issues with a high-priority tag or a good first issue tag to indicate their importance to the project and subjective level of easiness to get started on respectively. If you would like to start triaging issues, one easy way to get started is to subscribe to yarn on CodeTriage.

You can now proceed to run yarn watch in one tab, and test with yarn-local in the other. By contributing to Yarn, you agree that your contributions will be licensed under its BSD license. Find things to work on We label issues that we need help with the help wanted tag. We also categorize them with the following tags: cat-bug cat-feature cat-chore cat-performance These are the main categories that you can work on.

yarn run lint

Here are a few quick links to get you started: Good first bugs Good first features High impact issue that need help Issues need reproduction scripts Issues need triaging If you would like to start triaging issues, one easy way to get started is to subscribe to yarn on CodeTriage. Setup Ensure Node.

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Git clone the Yarn repository. From the root of the repository, run yarn to install the dependencies required for development. Building Perform a one-off build using: yarn build.Prerequisites: Node. If you are using an official Node. It is also possible to install ESLint globally rather than locally using npm install eslint --global. However, this is not recommended, and any plugins or shareable configs that you use must be installed locally in either case.

Note: If you are coming from a version before 1. After running eslint --inityou'll have a. In it, you'll see some rules configured like this:. The names "semi" and "quotes" are the names of rules in ESLint. The first value is the error level of the rule and can be one of these values:. The three error levels allow you fine-grained control over how ESLint applies rules for more configuration options and details, see the configuration docs.

Because of this line, all of the rules marked " " on the rules page will be turned on. Alternatively, you can use configurations that others have created by searching for "eslint-config" on npmjs.

ESLint will not lint your code unless you extend from a shared configuration or explicitly turn rules on in your configuration.


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