eslint | Find and fix problems in your JavaScript code | Code Analyzer library
kandi X-RAY | eslint Summary
kandi X-RAY | eslint Summary
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.
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Top functions reviewed by kandi - BETA
- 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 .
eslint Key Features
eslint Examples and Code Snippets
? 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
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
module.expor
npm install --save-dev eslint eslint-config-prettier eslint-config-react eslint-plugin-prettier eslint-plugin-react eslint-plugin-react-hooks prettier
or
yarn add -D eslint eslint-config-prettier eslint-config-react eslint-plugin-prettier eslint-pl
yarn add eslint --dev
yarn install --production
yarn build
export DISABLE_ESLINT_PLUGIN=true
yarn install --production
yarn build
ENV DISABLE_ESLINT_PLUGIN true
RUN
return {
needsValidation,
setNeedsValidation,
thingsToValidate,
setThingsToValidate,
}
useEffect(() => {
// Add something to validate
validationHook.setThingsToValidate(newThings)
{
"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 goodfile.js
(no output)
$ eslint badfile.js
(list of errors)
$ echo 'console.log(1)' | eslint --stdin
(list of errors)
$ eslint --fix badfile.js
:!eslint
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
eslint@8.6.0 | MIT | deps: 38 | versions: 294
An AST-based pattern checker for JavaScript.
https://eslint.org
keywords: ast, lint, javascript, ecmascript, espree
bin: eslint
dist
.tarball: https://registry.npmjs.org/eslint/-/eslint-8.6.
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$/);
files
Community Discussions
Trending Discussions on eslint
QUESTION
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:
...ANSWER
Answered 2021-Sep-06 at 09:40I got two different solution.
- remove
QUESTION
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
package.json
...ANSWER
Answered 2021-Oct-10 at 10:33https://github.com/typescript-eslint/typescript-eslint/issues/3982
It seems to be a compatibility problem
QUESTION
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?
ANSWER
Answered 2021-Dec-29 at 23:19what'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 https://github.com/flow-typed/eslint-plugin-ft-flow/pull/23.
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.
QUESTION
I need help debugging Webpack's Compression Plugin.
SUMMARY OF PROBLEM
- 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:
- (With Webpack Chain API)
ANSWER
Answered 2021-Sep-30 at 14:59It's not clear which server is serving up these assets. If it's Express, looking at the screenshot with the header X-Powered-By
, https://github.com/expressjs/compression/issues/71 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.
QUESTION
I have been using github actions for quite sometime but today my deployments started failing. Below is the error from github action logs
...ANSWER
Answered 2022-Mar-16 at 07:01First, 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:
For GitHub Actions: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.
As in actions/checkout issue 14, you can add as a first step:
QUESTION
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:
...ANSWER
Answered 2022-Mar-15 at 16:08I 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.
QUESTION
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.
...ANSWER
Answered 2021-Dec-17 at 09:47There 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
QUESTION
I got this error when learning Next.js, using npx create-next-app
command according to site documentation here https://nextjs.org/docs/api-reference/create-next-app. Everything works until I start the server,
Error stack:
...ANSWER
Answered 2021-Nov-24 at 21:38I found this solution https://github.com/webpack/webpack/issues/14532
if using bash just run
NODE_OPTIONS=--openssl-legacy-provider
before any commandadding
NODE_OPTIONS=--openssl-legacy-provider
to package.json
QUESTION
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...
firebase-debug.log
...ANSWER
Answered 2022-Feb-06 at 14:36Could 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:
QUESTION
I'm getting the following two errors on all TypeScript files using ESLint in VS Code:
...ANSWER
Answered 2021-Dec-14 at 12:09You missed adding this in your eslint.json
file.
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