babel-preset-env | PSA : this repo has been moved into babel/babel -- >
kandi X-RAY | babel-preset-env Summary
kandi X-RAY | babel-preset-env Summary
A Babel preset that compiles ES2015+ down to ES5 by automatically determining the Babel plugins and polyfills you need based on your targeted browser or runtime environments. Without any configuration options, babel-preset-env behaves exactly the same as babel-preset-latest (or babel-preset-es2015, babel-preset-es2016, and babel-preset-es2017 together). However, we don't recommend using preset-env this way because it doesn't take advantage of it's greater capabilities of targeting specific browsers. You can also configure it to only include the polyfills and transforms needed for the browsers you support. Compiling only what's needed can make your bundles smaller and your life easier. This example only includes the polyfills and code transforms needed for coverage of users > 0.25%, ignoring Internet Explorer 11 and Opera Mini.. We use browserslist to parse this information, so you can use any valid query format supported by browserslist. You can also target individual versions of browsers instead of using a query with "targets": { "chrome": "52" }.
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Top functions reviewed by kandi - BETA
- Create the import statement
- Creates a require statement
- Create a polyfill .
- Check if the require .
- Extracts the default list of platforms for platform .
- creates a polyfill
- Check if value is a polyfill
babel-preset-env Key Features
babel-preset-env Examples and Code Snippets
Community Discussions
Trending Discussions on babel-preset-env
QUESTION
I've been asked to go through our application and update all the frameworks as it was incredibly outdated, one of the things was to update babel, now one of our scripts in package.json was:
...ANSWER
Answered 2022-Mar-29 at 16:11You passed --presets=env
and the error is trying to tell you that instead of that, it should be --presets=@babel/preset-env
.
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'm using React and when I run the unit tests with "jest --coverage", the coverage report shows me the already compiled code (attached image).
It should show me in the report the component as I wrote it (I attach the code of my component).
Here the versions of the dependencies:
...ANSWER
Answered 2022-Mar-02 at 20:23I found the solution, it was just in the file jest.tsconfig.json change the field "sourceMap" to true:
QUESTION
I'm running into an error on Windows 10 whenever I try to run webpack, it works fine on macOS. This is the error
[webpack-cli] HookWebpackError: Not supported
It runs fine without "CopyPlugin", but I would like to copy img folder into dist folder. Have you experienced similar issues and how did you fix them?
...ANSWER
Answered 2022-Mar-02 at 02:37Your node version is lower than 12.20,Please select one of the schemes
1.Upgrade your node
npm install node@12.20.0 -g
Or the latest
npm install node@latest -g
Under Windows npm install node
may note work, and you should install the latest from https://nodejs.org/en/download/ using Windows Installer (.msi)
2.Reduce the version of copy-webpack-plugin
npm install copy-webpack-plugin@9 -D
QUESTION
I wanted to make a lighthouse test using cypress-audit, but after doing everything they said on https://www.npmjs.com/package/cypress-audit it doesn't work. I can use "cy.lighthouse()" in the cypress/support/commands.js, but not in files with extension like .spec.ts or .ts ( i get "Property 'lighthouse' does not exist on type 'cy & EventEmitter'.ts(2339)" error ). I already tried to find any solutions on the internet, but nothing worked.
package.json:
...ANSWER
Answered 2022-Jan-26 at 11:12There are some type defs in the cypress-audit package that should be kicking in. Perhaps it's the mixture of ts and js files?
Try adding these to /cypress/support/index.ts
QUESTION
I am running into a bug when trying to run 'npm start' for a react app.
My app had been running mostly as I expected while developing, however I ran into a bug that required me to update my node version as a potential fix. I updated node to v16.13.2 and I also decided to update npm to v8.3.2. Now when trying to run npm start I receive the following error. I also find it odd that the files referenced are not from directories within my current project folder.
I have tried the following so far:
- Deleting the package-lock.json and node_modules folder and then reinstalling with npm install.
- Restarting my computer.
- npm install react-scripts.
I was wondering if anyone could kindly help with a solution?
...ANSWER
Answered 2022-Jan-31 at 06:35After a week I have finally found a solution.
First I tried reinstalling an older versions of node and npm, which did not fix my issue. Then I reinstalled the versions I stated above.
Somehow my project became corrupted, potentially because I updated Node/NPM while it was open. I then tried carrying over my code into a new create-react-app. After doing this I went to my package.json folder and came to find my final steps was with the version I have of react in my dependencies.
The version of react I was using ( "react": "^17.0.2"
) is not compatiable with a lot of the node modules I'm using in my project, which caused them to not be found in NPM.
I was able to fix this by reverting to an older version of react by updating to the following in my dependencies for my package.json file:
QUESTION
ES6
syntax (or latest one) in my entire react-app built.
I've already managed to avoid polyfills in my own code by omitting some babel dependencies (such as @babel/preset-env
).
My bundled file does however hold, by most part, ES5
syntax. I'm assuming that babel (or webpack?) is polyfilling react and webpack's runtime to ES5
for browser compatibility.
Another option could be that webpack's runtime is natively supposed to use ES5
and cannot be converted to ES6
(current sustained possibility, see answer).
Here is my package.json
:
ANSWER
Answered 2021-Dec-31 at 21:37If you are not using @babel/preset-env
then your code shouldn't change by default. Only react should get transpiled to es5 (mostly JSX transpilation). You are probably mentioning the boilerplate code added by webpack which can be in es5.
you can use optimization: { minimize: false }
in your webpack config, to see your bundle better.
These boilerplates by webpack are called runtime.
There is no way to force webpack to use a set of features, but you can force it to NOT use a set of features threw output.environment.*
. For example with the code below you are saying to not use const
in the runtime code.
QUESTION
I want to use this react-file-viewer but I can't get it running. When I do npm install
I get massive error. I'm new to this.
My Node version is v16.9.1
This project is old and created for an older Node version I think so it's so many errors I don't know where to begin. Do you think it can work if I update all package.json dependencies to the newest version?
...ANSWER
Answered 2021-Dec-25 at 08:52The error happened when running node-gyp
during installation of node-sass
as you can see in the error. Also mentioned in the error log, you most likely do not have Python installed.
Try running node-gyp rebuild
.
If that fails, it means it is not setup correctly. Follow node-gyp
documentation to setup your environment correctly, then re-run npm install
.
Also, take a look at node-sass
supported Node version.
QUESTION
I'm building my first expo/react app. I keep getting an "Unexpected token" error message in App.js:
...ANSWER
Answered 2021-Dec-26 at 21:33The error is not because you are trying to use array de-structuring in general, it is because you are doing it inside the body of a class (where you can only declare properties).
React Hooks are only compatible with Function components anyway. You can't use them in Class components.
So you need to use Function Component syntax.
QUESTION
I have to use react translation for multiple languages. When I am installing
...ANSWER
Answered 2021-Dec-21 at 07:38Uncaught TypeError: Cannot read properties of undefined (reading 'string')
I believe the issue is where you are declaring your proptypes for StarRating
.
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