What to do if I am not able to host my React App? [closed] - reactjs

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Even if after trying the command "npm start" multiple times I am not able to view my React App on browser. Is there any solution for this ?
I was actually trying to view my React app in browser(Google Chrome). But some error was occuring.

if you have node and npm....
You can check it on your console:
node -v
npm -v
npx -v
Then you can:
npx create-react-app nameofapphere
cd nameofapphere
npm start
Have to work, yes or yes. on http://localhost:3000/

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how to refer react code from the GitHub into myself viscose [closed]

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everyone, I was new to react, so I want to refer someone in GitHub an error notification component code into myself viscose page, but I met couple of issues. Below is the link I follow as refer into my vscode
https://farbodsalimi.github.io/react-light-notifications/#installation.
after use the yarn command to install, I get a file named yarn.lock.
I attach the content of the yarn.lock file, I have no idea how can I use others built component as a component into my project.
I run couple of command:
npm i react-notifications
npm i react-notifications --force
npm audit fix --force
result: it pops up lots of error and warning, I am confusing

webpack < 5 used to include polyfills for node.js core modules [closed]

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BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default. This is no longer the case. Verify if you need this module and configure a polyfill for it.
i tried this but this doesn't work for me.
npm install --save-dev react-app-rewired crypto-browserify stream-browserify assert stream-http https-browserify os-browserify url buffer process

I installed the package on my React Native folder project, but always seems like this: EPERM [closed]

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I installed the package on my React Native folder project, but always seems like this:
After installing packages, you have to stop the metro server first.
When the server is running, it doesn't find the module you've installed.
So after stopping the server, reopen it by running
$ react-native start
and in another terminal run
$ react-native run-android
If the error still exists, then do the following:
$ rm -rf node_modules/
$ npm i
$ react-native start
$ react-native run-android # run this command in the different terminal.

Best way to install sass in create react app [closed]

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What is the best way to install sass in create-react-app?
(npm run eject or node-sass-chokidar)
Can I please get some help? Thanks.
Best way is reading the document.
Adding a CSS Preprocessor (Sass, Less etc.)
You’ll need to eject your project if you haven’t already
npm run eject
Install SASS
The SASS precompiler runs at build time not runtime, therefore we save it with the save-dev switch
npm install sass-loader node-sass --save-dev
Reference: https://medium.com/front-end-hacking/how-to-add-sass-or-scss-to-create-react-app-c303dae4b5bc

when making .apk file generate error [closed]

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When i run ( ionic cordova build android --release ) to make .apk file . the error occur ( TypeError: env.runcmd is not a function). I try following step to resolve like.
1.npm install #ionic/cli-plugin-cordova#latest
it not solve.
May be issues with your plugins out of date or any bugs with latest upgrades.
Try :
Remove your node_modules folder
npm install --save --save-exact ionic#3.6.0
npm install
Freshly install all the node modules.

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