Everytime I create React app and start the development server, I get this error. HELP!!!
Per this issue, it may be a problem with the react-scripts part of your library. So either use a specific, older version of create react app by running :
npx create-react-app#4.0.1 my-app
Or by running CRA as is, then modifying your package.json folder so that the react script version is specified.
So after you run CRA, change your package.json file like so:
{
"name": "myapp",
...
"dependencies": {
"#testing-library/jest-dom": "^4.2.4",
"#testing-library/react": "^9.4.0",
"#testing-library/user-event": "^7.2.1",
"react": "^16.12.0",
"react-dom": "^16.12.0",
"react-scripts": "4.0.1" // change this line to 4.0.1
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
...
}
Then make sure you rm -rf node_modules then run npm install to get a fresh install that removes whatever react-scripts came by default so that you use the specific 4.0.1 version.
Related
I am running react app in the nginx server by dockerizing it.
{
"name": "react-app",
"version": "0.1.0",
"private": true,
"dependencies": {
"axios": "^0.18.0",
"bootstrap": "^4.0.0-alpha.6",
"react": "^16.2.0",
"react-axios": "^2.0.0",
"react-dom": "^16.2.0",
"react-router-dom": "^4.2.2",
"react-scripts": "1.1.1"
},
"scripts": {
"start": "react-scripts start",
"build-window": "react-scripts build && del ../server/dist && move build ../server/dist",
"build-linux": "react-scripts build && rm -rf ../server/dist && mv build ../server/dist",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},
"homepage": "/myapp/"
}
if i dont put homepage entry i am able to run locally but in the ngInx server, css and js files are giving 404.
below is the path it is taking without context path in ngInx server for css https://XXXXXXXXXXXXXXXX/static/css/main.9a46c0ad.css
If i put homepage entry , i am getting "Uncaught SyntaxError: Unexpected token <" error . But in the network tab i see all the js and css files are loading properly..
Can you please help me, which area i have to concentrate to resolve this issue
Don't put your context root in the package.json. When you build the app you can give the the base-href in your build script. Add --base-href=/myapp/ in your build script. This will add the base href in your index.html
I'm trying to deploy a 'create-react-app' project to Heroku. I used the Heroku Create-React-App boilerplate and followed another tutorial on setting up a backend api for connecting to my custom server.js file.
When I deploy to Heroku, the build runs fine but my app still will not connect to my server.js file.
I assume this is either because the proxy property in my package.json is supposed to point to the same port defined in my server.js file (which Heroku would assign automatically, which I don't know how to check) or perhaps my server.js file isn't running at all.
Been having a very hard time finding any resources that properly explain how to deploy a 'create-react-app' with a custom back-end (server.js).
package.json:
{
"name": "my-app",
"version": "0.1.0",
"private": true,
"proxy": "https://localhost:5000",
"dependencies": {
"axios": "^0.17.1",
"body-parser": "^1.18.2",
"md5": "^2.2.1",
"mongodb": "^3.0.2",
"react": "^16.2.0",
"react-dom": "^16.2.0",
"react-scripts": "1.1.1",
"react-router": "^4.2.0",
"react-router-dom": "^4.2.2"
},
"scripts": {
"start": "react-scripts start",
"start:server":"node server.js",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
}
Line in server.js where I set the port:
const port = process.env.PORT || 5000;
I was able to deploy my app to Heroku by following this tutorial from fullstackreact.com and studying the accompanying repo.
Basically, I needed to bundle my client-side code and then make sure my server.js file was serving that bundle as a static file. I'm sure there's other ways to go about this, like running concurrent scripts for the webpack-dev-server and the backend api (server.js), but this worked for me without much headaches.
Here I am having a little addiction problem with reaction-native since yesterday................
it completely blocks me from navigating to certain screens etc.
Here is a copy of package. json:
{
"name": "test2",
"version": "0.1.0",
"private": true,
"devDependencies": {
"react-native-scripts": "1.7.0",
"jest-expo": "^22.0.0",
"react-test-renderer": "16.0.0-beta.5"
},
"main": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
"scripts": {
"start": "react-native-scripts start",
"eject": "react-native-scripts eject",
"android": "react-native-scripts android",
"ios": "react-native-scripts ios",
"test": "node node_modules/jest/bin/jest.js --watch"
},
"jest": {
"preset": "jest-expo"
},
"dependencies": {
"expo": "^22.0.2",
"mobx-react": "^4.3.4",
"react": "16.0.0-beta.5",
"react-native": "^0.49.5",
"react-native-elements": "^0.18.2",
"react-native-keyboard-aware-scroll-view": "^0.4.1",
"react-native-router-flux": "4.0.0-beta.23",
"react-navigation": "^1.0.0-beta.19"
}
}
How to install these outbuildings?
Where can I fix my problem if you've already had it, see?
thx!
You haven't installed the dependencies in your app. Either running
npm install
Has produced errors for those npm libraries, or it simply hasn't been run. Try running it, and if it still doesn't work, take a look at the contents of ./npm-debug.log for error messages related to it.
ETA: Looking closer, it seems that several of your dependencies require peers of specific versions of react, but you have a different version of react installed.
Are you using react#16.0.0-beta for a specific reason? Things like mobx are looking for react 13/14/15/16, but not 16b. I'd try this:
npm remove -S react
npm install -S react
and see if that works. If you were using the React beta for a reason, you may struggle to get these to talk to each other.
I've pulled a github repository containing code for a reactjs app into one of my directories but I can't find a way to run the app on my computer. I can start a new app using create-react-app but I can't/(don't know how to) use the existing app for instead ofa freshly created one.
I'm running Ubuntu 16.04.3 on a virtual machine, my node version is 4.2.6.
I've tried sudo apt-get install --only-upgrade nodejs but it simply says my node version is already up to date. (I include this because npm start gives me a bunch of errors and tells me that it may be because I might have to update node) but the app I create with create-react-app works fine?
The error:
Package.json:
{
"name": "my-app",
"version": "0.1.0",
"private": true,
"dependencies": {
"bootstrap": "^3.3.7",
"express": "^4.16.2",
"package.json": "^2.0.1",
"prop-types": "^15.6.0",
"react": "^16.0.0",
"react-bootstrap": "^0.31.5",
"react-dom": "^16.0.0",
"react-router-dom": "^4.2.2",
"react-scripts": "1.0.14",
"uuid": "^3.1.0",
"webpack": "^3.8.1"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-preset-env": "^1.6.1"
}
}
Carry out the following steps:
//Step 1:
git clone [repository url]
//Step 2:
cd [local repository]
//Step 3:
//Check package.json file and ensure scripts are notated as below:
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
//Step 4:
/* Delete the node_modules folder and any 'lock' files such as
yarn.lock or package-lock.json if present.*/
//Step 5:
npm install
//Step 6:
npm start
To Note: There can be some conflict between yarn and npm when cloning from certain repositories. It's best to assume that every repo may need trimming before ultimately running npm install. I tested the above steps several times under several different factors. This is the best I have so far.
In case of issues shown after npm install, run the below to automatically fix the issues:
npm audit fix
Alternatively, use the below to see the errors:
npm audit
I'm trying to setup my create-react-app instance with webpack-dev-server.
This is my package.json file
{
"name": "reactgs",
"version": "0.1.0",
"private": true,
"dependencies": {
"react": "^16.0.0",
"react-dom": "^16.0.0",
"react-scripts": "1.0.14"
},
"scripts": {
"start": "react-scripts start",
"build": "webpack-dev-server --entry ./node_modules/react-scripts/bin/react-scripts.js --output-filename ./dist/bundle.js --inline --progress",
},
"devDependencies": {
"webpack-dev-server": "^2.9.1"
}
}
I don't have a webpack.config.js file.
When I run
npm run build
The output appears as
The following line runs fine.
npm start
I also have webpack setup fine on the same machine for a different project.
Does anyone know how to properly configure webpack for create-react-app?
npm start does the HMR for you out-of-the box. It will host your application using webpack-dev-server --hot itself. You just need to hook the HMR code to tell webpack what to watch and reload as necessary.
This GitHub conversation offers a pretty decent simple solution for hooking HMR (https://github.com/facebookincubator/create-react-app/issues/2317) with and without Redux.