Problem
I'm setting up eslint with eslint-config-standard.
I'm also using babel plugin that #babel/plugin-proposal-class-properties.
I tried lint my javascript files by "eslint index.js" command, and I got error that "[eslint]: Parsing error: Unexpected token =".
So i installed babel-eslint, and I updated the file ".eslintrc" like this:
{
"extends": ["standard"],
"parser": "babel-eslint",
"rules": {
"eol-last": 0
}
}
The above configuration is solved error that "[eslint]: Parsing error: Unexpected token =", but i got new problem that eslint-config-standard configuration wasn't work anymore.
Question
I want to use eslint-config-standard with experimental javascript code.
But i don't know how to use those together and whether is it possible.
How to use those together?
p.s. Sorry for my bad English :(
Yes it is possible. You just need to install a wrapper for Babel's parser used for ESLint and plugin.
https://github.com/babel/babel-eslint
https://github.com/babel/eslint-plugin-babel
$ npm install eslint babel-eslint eslint-plugin-babel --save-dev
# or
$ yarn add eslint babel-eslint eslint-plugin-babel -D
And then, inside your .eslintrc you need to add
"parser": "babel-eslint",
"plugins": ["babel"],
Also, if it doesn't work on the first try, you may need to restart your code editor. Good luck! :)
Related
I follow the guide to install stylelint vscode extension, but it does not work on my computer.
I'm pretty sure that I follow all the necessary steps.
Install Extensions.
Disable the built-in linters in User setting.
Use npm to install stylelint and its standard configuration.
Create a .stylelintrc.json configuration file in the root of my project.
Run stylelint from command-line.
But the extention still not automatically validate the css, what is going wrong?
After reading the guide again, I found the setting stylelint.config and understand its definition:
Set stylelint config option. Note that when this option is enabled, stylelint doesn't load configuration files.
So I look at my vscode user setting, oh, stylelint.config: {}. After changing it to null, stylelint automatically validates the css file immediately.
Phew~
I faced the same issue. Let me share how I got it to work smoothly with Stylelint extension ver.1.2.2:
In root project folder, you should have the following structure:
/path/to/project/
.vscode/
settings.json
extensions.json
src/
.stylelintrc.json
package.json
extensions.json
From the official documentation: Starting with 1.x, vscode-stylelint will depend on having a copy of Stylelint installed in the open workspace (recommended) or globally (not recommended). If the extension doesn't seem to be linting any documents, make sure you have Stylelint installed
{
"recommendations": ["stylelint.vscode-stylelint"]
}
settings.json
{
"css.validate": false,
"less.validate": false,
"scss.validate": false,
"stylelint.validate": ["css", "scss"]
}
package.json
Some of the following packages are to detect reserved words inside sass files such us #use, #export, #global and so on. I think you don't actually need all of them, but it is my configuration.
// DevDependencies
"stylelint": "^14.6.0",
"stylelint-config-css-modules": "^4.1.0",
"stylelint-config-standard-scss": "^3.0.0",
"stylelint-scss": "^4.2.0"
.stylelintrc.json
{
"extends": ["stylelint-config-standard-scss", "stylelint-config-css-modules"],
"plugins": ["stylelint-scss"],
"rules": {
"at-rule-no-unknown": null,
"scss/at-rule-no-unknown": true
}
}
After configuring each file, remember to close vscode and open it again in order to start enjoying Stylelint!
In the extension settings, you should to check the file extensions, which it is watching:
Stylelint: Snippet
Stylelint: Validate
You can also do it through setting.json
"stylelint.snippet": [
"css",
"less",
"postcss",
"scss"
],
"stylelint.validate": [
"css",
"less",
"postcss",
"scss"
]
Open extension settings to add a configuration rules source stylelint-config-standard-scss (or whatever you installed, more here )
For example, I have this, additionally rewritten some of my rules:
"stylelint.config": {
"extends": "stylelint-config-standard-scss",
"rules": {
"no-empty-source": null,
"no-missing-end-of-source-newline": null,
"max-line-length": [
300,
{"ignore": ["comments"]}
],
"selector-combinator-space-after": "never",
"selector-combinator-space-before": "never"
}}
The same settings in the linter for the GitHub Action and in the VSCode extension are very convenient. Now I know about the problems in advance and do not wait until the build happens in the repository.
I got a new PC and installed the newest version, 1.2.1, and nothing worked - then I checked the version on the old PC, and it was at version 0.86.0. When changing the version to the older version and reloading VSC, it worked immediately.
Starting with an empty directory, is it possible to do that? Should I use stage-0 like it is on the Babel REPL?
I hope to transpile it just like how ReactJS does it. For some reason, I always got an error for just a file containing:
let obj = { a: 1 };
let newObj = {
...obj,
ha: 3
};
Other times, I can transpile a file, but if I transpile a folder, it'd say:
foo.js: Cannot read property 'contexts' of null
The commands I tried included:
npx babel src --out-dir compiled --presets=es2015,react,minify --watch
but the errors I mentioned above appeared. Also, when I do
npm install babel-minify
it reported
found 2489 vulnerabilities (849 low, 306 moderate, 1329 high, 5 critical)
There is also a notice
As of v7.0.0-beta.55, we've removed Babel's Stage presets.
Please consider reading our blog post on this decision at
https://babeljs.io/blog/2018/07/27/removing-babels-stage-presets
for more details. TL;DR is that it's more beneficial in the
long run to explicitly add which proposals to use.
and I wonder what should be done.
Is it possible to
just continuously minify a folder
transpile some ES6 or ES7, 8 syntax that are not yet commonly supported
transpile JSX as well
?
I have found some reliable ways to make it work, although I am not sure when I should use babel.config.json and when to use .babelrc.json or .babelrc. It seems I have to run babel as ./node_modules/.bin/babel and is it true if I don't npm install babel using the -g option.
Here is what works:
create a folder, such as TryBabel
cd TryBabel
Go to https://babeljs.io/setup.html and click "CLI"
You need a package.json, so use npm init and just press Enter a few times
It should lead you to install
a. npm install --save-dev #babel/core #babel/cli
b. now look at your package.json. Remove the script about test but use this: "build": "babel src -d lib"
Now npm run build or ./node_modules/.bin/babel src -d lib should work, but make sure you have some .js files in the src folder. The transpiled result will be in the lib folder.
Now to transpile things into "pre ES6", just follow the #babel/preset-env instructions:
a. npm install #babel/preset-env --save-dev
b. make your babel.config.json to contain { "presets": ["#babel/preset-env"] }
Now you can use npm run build to transpile once, or use ./node_modules/.bin/babel src -d lib --watch to keep on running it and "watch" the src folder and transpile files in it when the files change.
To do minification or make it work with JSX/React, see
https://babeljs.io/docs/en/babel-preset-minify
and
https://babeljs.io/docs/en/babel-preset-react
and make sure your babel.config.json file looks like:
{
"presets": [
[
"#babel/preset-env",
{
"useBuiltIns": "entry"
}
],
["#babel/preset-react"],
["minify"]
]
}
and remove minify if you don't want the code to be minified.
I have vscode 1.9 and I want to have intellisense for jest tests. The problem is that describe, it, expect etc are globally available in jest and you don't need to import them in your test files. So vscode will not show intellisense for them.
Is there any configuration for globals for automatic type acquisition?
You have a few options in this case:
Add jest to your package.json:
"dependencies": {
"jest": "^18.1.0"
}
This only works if you are working JavaScript and do not have a tsconfig.json.
Install #types/jest
$ npm install -D #types/jest
This should work for both JavaScript and TypeScript projects. However #types but may be disabled by a jsconfig.json/tsconfig.json: http://www.typescriptlang.org/docs/handbook/tsconfig-json.html
Create a jsconfig.json file in the root of your workspace to specifically include jest:
{
"typeAcquisition": {
"include": [
"jest"
]
}
}
This will only work for JavaScript projects when automatic typings acquisition is enabled.
All of these should allow VSCode to pick up jest's typings without an import or require
I tried installing the #types/jest, and it did work, but the problem is that it resulted in the jest suggestions appearing in my .js files as well. I couldn't figure out how to get global suggestions for test, expect, etc. in only .test.js files but not .js files.
So I decided to just manually import each jest global I was going to use in each .test.js file, which allowed the suggestions to appear with types but avoided having the suggestions appear in the .js files:
import { test, expect } from '#jest/globals'
npm install -D #types/jest
edit jest.config.js
typeAcquisition: {
include: ['jest'],
},
I am trying to use Karma with Coffeescript. The following preprocessor line is there in karma config file:
preprocessors: {
'**/*.coffee': 'coffee'
}
But I am getting the error -
Can not load "coffee", it is not registered!
Perhaps you are missing some plugin?
karma-coffee-preprocessor is available as devDependencies in package.json. Has anyone faced this issue? Thanks.
I figured out the solution. It is because of not installing karma-cli. I though installing karma globally is enough. But after installing karma-cli everything is fine.
I'm having trouble finding the correct way to use babel to allow me to use jsx in serverside.
Node-jsx was deprecated for babel. It seems like babel-core/register is whats supposed to be used but I still get unexpected token issues.
I created a repo with the problem im having.
https://github.com/pk1m/Stackoverflow-helpme
When I run node app or npm run watch-js I keep getting unexpected token referring to the JSX code '<'.
How do I get babel to transpile JSX, or am I completely off, thanks.
You need to use babel-register (npm i babel-register --save). And run on your server:
require('babel-register')({
stage: 0
});
You can omit stage 0 if you aren't using experimental babel features. Also you might prefer to put those options in .babelrc instead.
Note that it will only work for files required AFTER calling that (so it would not have an effect on the file you include it in).
You could also have the presets and other options in a .babelrc file.
For babel 6x:
npm i babel-register babel-preset-es2015 babel-preset-react --save
require('babel-register')({
presets: ['es2015', 'react']
});
Note: there are also stage 0-2 presets.
For watching as you've written in your package.json you could try a CLI command like the one facebook are suggesting in the note here (or use webpack):
babel --presets react es2015 --watch app/ --out-dir build/