eslint | Find and fix problems in your JavaScript code | Code Analyzer library

 by   eslint JavaScript Version: 9.4.0 License: MIT

kandi X-RAY | eslint Summary

kandi X-RAY | eslint Summary

eslint is a JavaScript library typically used in Code Quality, Code Analyzer applications. eslint has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i wang_eslint' or download it from GitHub, npm.

ESLint's parser only officially supports the latest final ECMAScript standard. We will make changes to core rules in order to avoid crashes on stage 3 ECMAScript syntax proposals (as long as they are implemented using the correct experimental ESTree syntax). We may make changes to core rules to better work with language extensions (such as JSX, Flow, and TypeScript) on a case-by-case basis. In other cases (including if rules need to warn on more or fewer cases due to new syntax, rather than just not crashing), we recommend you use other parsers and/or rule plugins. If you are using Babel, you can use @babel/eslint-parser and @babel/eslint-plugin to use any option available in Babel. Once a language feature has been adopted into the ECMAScript standard (stage 4 according to the TC39 process), we will accept issues and pull requests related to the new feature, subject to our contributing guidelines. Until then, please use the appropriate parser and plugin(s) for your experimental feature.

            kandi-support Support

              eslint has a medium active ecosystem.
              It has 22817 star(s) with 4161 fork(s). There are 318 watchers for this library.
              There were 10 major release(s) in the last 6 months.
              There are 112 open issues and 9532 have been closed. On average issues are closed in 40 days. There are 18 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of eslint is 9.4.0

            kandi-Quality Quality

              eslint has 0 bugs and 0 code smells.

            kandi-Security Security

              eslint has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              eslint code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              eslint is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              eslint releases are available to install and integrate.
              Deployable package is available in npm.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed eslint and discovered the below as its top functions. This is intended to give you an instant insight into eslint implemented functionality, and help decide if they suit your requirements.
            • If a given element has a focusable feature we want to select it .
            • Validates JSDoc comments .
            • Reduce the number of samples that can be written to a source code sample
            • Runs rules in the source code .
            • Fuzzily .
            • Processes the options .
            • Adds a code path to the code path .
            • Check a given node
            • Extract rule comments from a given ast .
            • Creates a new environment with the current parent directory .
            Get all kandi verified functions for this library.

            eslint Key Features

            No Key Features are available at this moment for eslint.

            eslint Examples and Code Snippets

            [책] 러닝 자바스크립트,개발도구 설치,6. 린트
            JavaScriptdot img1Lines of Code : 96dot img1no licencesLicense : No License
            copy iconCopy
            ? How would you like to configure ESLint? Answer questions about yo
            ur style
            ? Are you using ECMAScript 6 features? Yes
            ? Are you using ES6 modules? Yes
            ? Where will your code run? Node
            ? Do you use JSX? No
            ? What style of indentation do you use? Tab  
            JavaScriptdot img2Lines of Code : 80dot img2no licencesLicense : No License
            copy iconCopy
            npm i -g eslint@latest
            eslint --init
              "scripts": {
                "lint": "eslint --ext .js,.vue src"
              "scripts": {
                "lint": "eslint --fix --ext .js,.vue src"
            npm install -D eslint-plugin-html
            JavaScriptdot img3Lines of Code : 77dot img3no licencesLicense : No License
            copy iconCopy
            npm install --save-dev eslint eslint-config-prettier eslint-config-react eslint-plugin-prettier eslint-plugin-react eslint-plugin-react-hooks prettier
            yarn add -D eslint eslint-config-prettier eslint-config-react eslint-plugin-prettier eslint-pl  
            Heroku failed to load config "google" to extend from. Referenced from: /app/.eslintrc.json
            JavaScriptdot img4Lines of Code : 13dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            yarn add eslint --dev
            yarn install --production
            yarn build
            export DISABLE_ESLINT_PLUGIN=true
            yarn install --production
            yarn build
            Better Structure for React Custom Hooks that avoid `exhaustive-deps` warning?
            JavaScriptdot img5Lines of Code : 49dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
              return {
             useEffect(() => {
                // Add something to validate
            How to disable warnings for identifiers prefixed with underscore (_)
            Lines of Code : 40dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
              "name": "Disable warnings when prefixed with underscore (_)",
              "dependencies": {
                "@testing-library/jest-dom": "^4.2.4",
                "@testing-library/react": "^9.4.1",
                "@testing-library/user-event": "^7.2.1",
                "react": "^17.0.2",
            ESLint / Vim (or neovim) workflow
            Lines of Code : 19dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            $ eslint goodfile.js
            (no output)
            $ eslint badfile.js
            (list of errors)
            $ echo 'console.log(1)' | eslint --stdin
            (list of errors)
            $ eslint --fix badfile.js
            Is it possible to ignore ESLint configuration files in certain, but not all, parent directories?
            JavaScriptdot img8Lines of Code : 12dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            module.exports = {
              // Do not search for ESLint configuration files in parent directories because
              // Drupal 9 puts one in the *web* directory which we do not want applied.
              // However, do manually extend from the ESLint configurat
            npm show --outdated produces a E404 'is not in this registry' error
            JavaScriptdot img9Lines of Code : 45dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            eslint@8.6.0 | MIT | deps: 38 | versions: 294
            An AST-based pattern checker for JavaScript.
            keywords: ast, lint, javascript, ecmascript, espree
            bin: eslint
            How to import a folder of svg files into react as ReactComponents
            JavaScriptdot img10Lines of Code : 12dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            interface CardCache {
                [key: string]: React.FunctionComponent>;
            const cache: CardCache = {};
            /* eslint import/no-webpack-loader-syntax: off */
            const files = require.context("!svg-react-loader?name=card!./", true, /\.svg$/);

            Community Discussions


            Error while loading rule 'prettier/prettier': context.getPhysicalFilename is not a function
            Asked 2022-Apr-04 at 13:24

            I am learning react js. I am a very beginner at this topic. But when I am doing setup to create a react environment I got an error. I have tried to solve the problem by Charles Stover blog in medium. But I got an error Command "up" not found.

            Here's my index.js file:



            Answered 2021-Sep-06 at 09:40

            I got two different solution.

            1. remove



            ESLint: 8.0.0 Failed to load plugin '@typescript-eslint'
            Asked 2022-Mar-31 at 09:08

            Could you help me, I've got this error when I try building a project?

            Oops! Something went wrong! :(

            ESLint: 8.0.0

            TypeError: Failed to load plugin '@typescript-eslint' declared in 'src.eslintrc': Class extends value undefined is not a constructor or null Referenced from: src.eslintrc




            Answered 2021-Oct-10 at 10:33


            Failed to load plugin 'flowtype' declared in 'package.json » eslint-config-react-app': Cannot find module 'eslint/use-at-your-own-risk'
            Asked 2022-Mar-29 at 06:53

            I created a new React project with create-react-app.

            In the terminal npm start.

            Instantly get this error

            Failed to load plugin 'flowtype' declared in 'package.json » eslint-config-react-app': Cannot find module 'eslint/use-at-your-own-risk'

            How do I fix this?

            Not this project specifically, but how do I get create-react-app to create without errors?



            Answered 2021-Dec-29 at 23:19

            what's happening is that when you run npm start it's probably doing some checks with eslint, from what I remember create-react-app has some checks that break your build if you have eslint errors so makes sense that they're associated.

            The error you're getting here is related to a node feature that eslint is using called subpath exports but it's support is hit or miss depending on how the library is consumed. This has been highlighted to cause issues when used with jest for example.

            For the flowtype eslint plugin this is the exact line of code that's causing you issues.

            You can also read about a similar issue reported regarding the typescript eslint plugin.

            The solution and the reason I'm even able to understand what's causing this problem is that I made a fix to this yesterday in a clone of the eslint-plugin-flowtype (given that the original plugin had a lack of maintenance) here

            I'll raise an issue with create-react-app and see if they're willing to swap out the plugin with the new one which would have more maintenance and solve issues that you're experiencing.



            Vuejs Webpack Compression Plugin not compressing
            Asked 2022-Mar-28 at 12:53

            I need help debugging Webpack's Compression Plugin.


            • Goal is to enable asset compression and reduce my app's bundle size. Using the Brotli algorithm as the default, and gzip as a fallback for unsupported browsers.
            • I expected a content-encoding field within an asset's Response Headers. Instead, they're loaded without the field. I used the Chrome dev tools' network tab to confirm this. For context, see the following snippet:
            • No errors show in my browser or IDE when running locally.

            WHAT I TRIED

            • Using different implementations for the compression plugin. See below list of approaches:
              1. (With Webpack Chain API)


            Answered 2021-Sep-30 at 14:59

            It's not clear which server is serving up these assets. If it's Express, looking at the screenshot with the header X-Powered-By, shows that Brotli support hasn't been added to Express yet.

            There might be a way to just specify the header for content-encoding manually though.



            The unauthenticated git protocol on port 9418 is no longer supported
            Asked 2022-Mar-27 at 13:23

            I have been using github actions for quite sometime but today my deployments started failing. Below is the error from github action logs



            Answered 2022-Mar-16 at 07:01

            First, this error message is indeed expected on Jan. 11th, 2022.
            See "Improving Git protocol security on GitHub".

            January 11, 2022 Final brownout.

            This is the full brownout period where we’ll temporarily stop accepting the deprecated key and signature types, ciphers, and MACs, and the unencrypted Git protocol.
            This will help clients discover any lingering use of older keys or old URLs.

            Second, check your package.json dependencies for any git:// URL, as in this example, fixed in this PR.

            As noted by Jörg W Mittag:

            There was a 4-month warning.
            The entire Internet has been moving away from unauthenticated, unencrypted protocols for a decade, it's not like this is a huge surprise.

            Personally, I consider it less an "issue" and more "detecting unmaintained dependencies".

            Plus, this is still only the brownout period, so the protocol will only be disabled for a short period of time, allowing developers to discover the problem.

            The permanent shutdown is not until March 15th.

            For GitHub Actions:

            As in actions/checkout issue 14, you can add as a first step:



            ESlint - Error: Must use import to load ES Module
            Asked 2022-Mar-17 at 12:13

            I am currently setting up a boilerplate with React, Typescript, styled components, webpack etc. and I am getting an error when trying to run eslint:

            Error: Must use import to load ES Module

            Here is a more verbose version of the error:



            Answered 2022-Mar-15 at 16:08

            I think the problem is that you are trying to use the deprecated babel-eslint parser, last updated a year ago, which looks like it doesn't support ES6 modules. Updating to the latest parser seems to work, at least for simple linting.

            So, do this:

            • In package.json, update the line "babel-eslint": "^10.0.2", to "@babel/eslint-parser": "^7.5.4",. This works with the code above but it may be better to use the latest version, which at the time of writing is 7.16.3.
            • Run npm i from a terminal/command prompt in the folder
            • In .eslintrc, update the parser line "parser": "babel-eslint", to "parser": "@babel/eslint-parser",
            • In .eslintrc, add "requireConfigFile": false, to the parserOptions section (underneath "ecmaVersion": 8,) (I needed this or babel was looking for config files I don't have)
            • Run the command to lint a file

            Then, for me with just your two configuration files, the error goes away and I get appropriate linting errors.



            Error when deploying react app and it keeps sayings << Plugin "react" was conflicted between "package.json » eslint-config-react-app » >>
            Asked 2022-Mar-09 at 14:04

            I have been having a little bit of issues when deploying my create react app, as it fails to compile and tells me Plugin "react" was conflicted between "package.json » eslint-config-react-app »

            I was wondering if somebody has encountered the same issue and knows how to solve it, thank you! I am still very new to all this.



            Answered 2021-Dec-17 at 09:47

            There is a conflict in the casing

            C:\Users\Ruben|desktop\reactapp\test.... whereas the nodemodules is looking for C:\Users\Ruben|Desktop\Reactapp\test....

            This is a windows specific problem, and previously react would have run the app regardless of this difference. Not anymore it seems.

            The solution I used was to locate the folder and open with code; that ensures that the path matches directly with what is stored in node modules



            Getting error 'digital envelope routines', reason: 'unsupported', code: 'ERR_OSSL_EVP_UNSUPPORTED'
            Asked 2022-Mar-05 at 09:54

            I got this error when learning Next.js, using npx create-next-app command according to site documentation here Everything works until I start the server,

            Error stack:



            Answered 2021-Nov-24 at 21:38

            I found this solution

            1. if using bash just run NODE_OPTIONS=--openssl-legacy-provider before any command

            2. adding NODE_OPTIONS=--openssl-legacy-provider to package.json



            Firebase function failing to deploy
            Asked 2022-Feb-17 at 15:31

            I'm trying to create a Firebase Function but I'm running into a deploy error, even when deploying the default helloworld function.

            The firebase-debug.log file mentions this: Could not find image for function projects/picci-e030e/locations/us-central1/functions/helloWorld.

            I have been trying to debug and so far have not been able to solve it...




            Answered 2022-Feb-06 at 14:36

            Could not find image for function projects/picci-e030e/locations/us-central1/functions/helloWorld.

            The Firebase Function deployment failed because it cannot find the image built based on your function app. There might be a problem building in your app, it could be your dependencies or files.

            I replicated your issue, received the same error and solved it. There's a problem with the package.json file and package-lock.json. If you just add(without installing) your dependency in package.json you should delete or remove your package-lock.json that will be found in function directory before you deploy it again using the deployment command:



            ESLint Definition for rule 'import/extensions' was not found
            Asked 2022-Feb-14 at 08:36

            I'm getting the following two errors on all TypeScript files using ESLint in VS Code:



            Answered 2021-Dec-14 at 12:09

            You missed adding this in your eslint.json file.


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install eslint

            You can install using 'npm i wang_eslint' or download it from GitHub, npm.


            Yes, ESLint natively supports parsing JSX syntax (this must be enabled in configuration). Please note that supporting JSX syntax is not the same as supporting React. React applies specific semantics to JSX syntax that ESLint doesn't recognize. We recommend using eslint-plugin-react if you are using React and want React semantics.
            Find more information at:

            Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items

            Find more libraries
          • npm

            npm i eslint

          • CLONE
          • HTTPS


          • CLI

            gh repo clone eslint/eslint

          • sshUrl


          • Stay Updated

            Subscribe to our newsletter for trending solutions and developer bootcamps

            Agree to Sign up and Terms & Conditions

            Share this Page

            share link

            Explore Related Topics

            Consider Popular Code Analyzer Libraries


            by airbnb


            by standard


            by eslint


            by rome


            by python

            Try Top Libraries by eslint


            by eslintJavaScript


            by eslintJavaScript


            by eslintJavaScript


            by eslintJavaScript


            by eslintJavaScript