Related
I want to add a .env file in my React application.
The project wasn't created using Create React APP. And without Webpack.
I'm struggling to find a proper solution for this
For a easy solution you could try to use react-app-env.
You could folllow this simple guide. In brief:
install it:
yarn add --dev react-app-env (or npm install --save-dev react-app-env)
change the start and build scripts:
"scripts": {
"start": "react-app-env start'",
"build": "react-app-env build'",
"test": "react-app-env test'",
...
}
finally add at least two configuration files (on project root folder): development.env and production.env. By default development.env is used imported on npm start and npm test, and production.env on npm build.
What exactly these two do, where to use them ?
yarn install
yarn build
In a nutshell, yarn install is the command used to install all dependencies for a project, usually allocated in the package.json file. In most scenarios it is because you cloned a project and need its dependencies installed to run it.
On the other hand, yarn build is not a built-in command in the Yarn package manager. Looking at your question, it seems like you are running some #reactjs project, which might have defined a build command in its package.json file.
I hope this clarifies your doubt, but for a complete answer, please provide an example of what is your specific scenario.
Also be aware that when running custom scripts like build, test, deploy, etc. it is recommended tu use the yarn run [script] command as stated in the Yarn docs, in your case yarn run build.
yarn install is used to fetch and install all dependencies for your project which are defined in your package.json. You might want to do this when you add a dependency or if you freshly checked out the project on another computer. Also read the docs on yarn install.
yarn run build calls the script that you configured for the "build" command in your package.json. Note that yarn build is not a valid yarn command.
{
"name": "my-package",
"scripts": {
"build": "babel src -d lib" // <-- this will be executed
}
}
Also see the yarn run documentation
I am trying to learn React and I am using a private repo to start with it.
I run yarn start in the directory of the repo but I get the error message:
yarn run v1.13.0
error Command "start" not found.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
I have both node and yarn installed.
For node:
v10.15.0
node is /usr/local/bin/node
For yarn:
1.13.0
yarn is /usr/local/bin/yarn
I tried to reinstall both node and yarn but I get the same error message. moreover I tried to remove the yarn chance via yarn cache clean but nothing seems to work.
The package.json contains the following:
{
"name": "02-Manipulating-Strings",
"version": "1.0.0",
"author": "ssaunier",
"license": "UNLICENSED",
"private": true,
"devDependencies": {
"eslint": "^4.7.2",
"eslint-config-airbnb-base": "^12.0.0",
"eslint-plugin-import": "^2.7.0",
"jest": "^21.1.0"
},
"scripts": {
"test": "(eslint lib || true) && jest"
}
}
The directory is organised in the following way:
There is no start command inside the scripts of the package.json file.
"scripts": {
"start": "some command to be run", // you need to add this line
"test": "(eslint lib || true) && jest"
}
Maybe you want to run the test command instead - npm test / yarn test?
Just run
yarn add react-scripts
Solved it thanks to the insight of the user: Tsvetan Ganev.
I was trying to run a command that it is not in my scripts. Specifically, yarn start is not in the scripts part of the file package.json.
To solve the issue I added the following line in scripts
"start": "webpack-dev-server --mode development",
I got the same error message "start" command not found. My issue got resolved by following the below mentioned steps.
-open the folder in which you want to create the app using terminal then type these commands:
npm uninstall -g create-react-app
npx create-react-app FolderName
(This will automatically install the latest create-react-app version)
-Then run the command yarn start and it will work.
I had this problem. I figured the best way is this.
npm i -g create-react-app
create-react-app my-react-app //or whatever you want your project to be
cd my-react-app
yarn start
You can also try to run first npm install and then npm run or first yarn and then yarn start
I had the same issue start command not found.
I followed below instruction to recreate react app
. Go to your parent folder in cmd
. Type yarn add create-react-app
. And yarn create-react-app FolderName
After installing yarn start will work.
Well, I was getting this error cause I was dumb Not going inside the main project folder.so it actually not able to find .json file too😁
Adding this to package.json worked for me
"scripts": {
"start": "expo start",
"android": "expo start --android",
"ios": "expo start --ios",
"web": "expo start --web",
"eject": "expo eject"
},"devDependencies": {
"babel-preset-expo": "^7.0.0"
},
If you are using create-react-app and encountered this error, chances are you did not install create-react-app successfully.
Try removing globally installed create-create-app as explained below.
Template not provided using create-react-app
check your package.json that has "start" scripts.
if you just have dependency list, make sure you have the following on the package.jons
"devDependencies": {
"#theia/cli": "next"
},
"scripts": {
"prepare": "yarn run clean && yarn build && yarn run download:plugins",
"clean": "theia clean",
"build": "theia build --mode development",
"start": "theia start --plugins=local-dir:plugins",
"download:plugins": "theia download:plugins"
},
"theiaPluginsDir": "plugins",
"theiaPlugins": {
"vscode-builtin-css": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/css-1.39.1-prel.vsix",
"vscode-builtin-html": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/html-1.39.1-prel.vsix",
"vscode-builtin-javascript": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/javascript-1.39.1-prel.vsix",
"vscode-builtin-json": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/json-1.39.1-prel.vsix",
"vscode-builtin-markdown": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/markdown-1.39.1-prel.vsix",
"vscode-builtin-npm": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/npm-1.39.1-prel.vsix",
"vscode-builtin-scss": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/scss-1.39.1-prel.vsix",
"vscode-builtin-typescript": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/typescript-1.39.1-prel.vsix",
"vscode-builtin-typescript-language-features": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/typescript-language-features-1.39.1-prel.vsix"
}
}
otherwise run this on the folder where package.json is
error Command "start" not found.
yarn run theia start /home --hostname 0.0.0.0 --port 8080
theia should start on port 8080 minimally.
If you get error Command "start" not found. after creating new project using create-react-app you most probably would have created the app using npm.
To do it correctly delete the directory of the project and recreate the project using yarn with the following command
yarn create react-app my-app
After that yarn start works perfectly fine.
i got the same issue. it cusses you have installed packages in wrong directory.
in cmd terminal:-(D:\PROJECT)=> my cmd file path shows
D:\PROJECTS\npx create-react-app app-react
(when you enter this command it will create new file named app-react . then you have to go into the app-react file . use this command to go to the that file "cd app-react" then enter. you will see cmd path )
D:\PROJECTS\cd app-react
D:\PROJECTS\app-react\
then install other yarn packges
D:\PROJECTS\app-react\yarn add #chakra-ui/react #emotion/react#^11 #emotion/styled#^11 framer-motion#^4
D:\PROJECTS\app-react\yarn add react-icons
D:\PROJECTS\app-react\yarn add react-router-dom
then yarn start
D:\PROJECTS\app-react\yarn start
if it is won't open check yarn package installed using this command
D:\PROJECTS\app-react\yarn -version
1.22.10
for install yarn
npm install --global yarn
just run following commands:
npm uninstall -g create-react-app
npx create-react-app FolderName
I had a similar problem while I have "start" script in my package.json. Eventually, I figured out that I had not saved the package.json, so I got this error. Obviously, after saving the package.json the problem was resolved.
This issue happens when file "package.json" will gets deleted or changed. Please check your
"package.json" file.
It may sound silly, but I was having this same problem and all I did was close the program (vscode), and reopen it. I made sure it was inside the correct project folder (web) and did the process again. It worked. In my case it was just a lack of attention.
I hope your problem is as simple as mine.
Hug!
i solve the problem whit this:
Since create-react-app 3.3.0 it's not longer recommended to use a global installation of CRA.
However, after following the recommended way, uninstalling CRA globally and using npm,I ran into the following problem for my new React project:
A template was not provided. This is likely because you're using an outdated version of create-react-app.
It seems like CRA wasn't properly uninstalled. I had to do the following:
After uninstalling it with npm uninstall -g create-react-app, check whether you still have it "installed" with which create-react-app on your command line. If it returns something (e.g. /usr/local/bin/create-react-app), then do a rm -rf /usr/local/bin/create-react-app to delete manually.
Afterward, I was able to use npx create-react-app my-app with the latest version of CRA where I would have the default template for the src/ folder
Nov 2020
This might happen when you clone a git repo created with an older version of create-react-app or event with another setup.
First install react-scripts as
yarn add react-scripts
Or
npm install react-scripts
Then if having problem with react-scripts, refer to this SO thread.
Firstly, you can try
npm install
then
You can also try to run first npm install and then npm run or first yarn and then yarn start
I have solved my issues with the following command. Try this command, hope you will get rid of the problems.
npm run start
I also face this error but in my case I think, I have done all the above steps but the error still remaining the last thing I did in my main node_module/.bin/ folder I saw there are two dependencies one is create-react-app it fine but another one is creat-app-react so I deleted this dependency and also remove from my package.json file.
So now yarn start is working perfectly.
just run command
corepack disable
if you ran the following command before
corepack enable
I was outside the project. So I type cd myProject and than yarn run
{
test: /\.scss$/,
include: [/vue-components|views/],
use: [
'vue-style-loader',
'css-loader',
'sass-loader',
],
},
put this in webpack.config.js in module object.
one of the reasons behind this is watch if you are in the right directory type cd your_file_name then type npm run dev
I had the same issue. Just run
npm install --global yarn
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "jest",
"eject": "react-scripts eject" },
I found that when I added this into the scripts section package.json dependency; it worked! This way, you'll get the https://localhost:3000 instead of using the 8080 port.
I had this problem and just solved it! Super easy, I hope it helps you:
The problem: "node_modules" was duplicated. You may have accidentally downloaded a duplicated "node_modules" folder when calling yar originally.
Go to "User/#yourname/node_modules" and delete the folder.
just start the app via debug option
enter image description here
The Problem
create-react-app initializes a repository where babel-loader is installed as an older version than needed.
LOG:
There might be a problem with the project dependency tree.
It is likely not a bug in Create React App,
but something you need to fix locally.
The react-scripts package provided by Create React App requires a dependency:
"babel-loader": "8.0.4"
Don't try to install it manually: your package manager does it automatically.
However, a different version of babel-loader was detected higher up in the tree:
C:\Users\user\node_modules\babel-loader (version: 8.0.2)
Manually installing incompatible versions is known to cause hard-to-debug issues.
If prefer to ignore this check, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
That will permanently disable this message but you might encounter other issues.
To fix the dependency tree, try following the steps below in the exact order:
1. Delete package-lock.json (not package.json!) and/or yarn.lock in your project folder.
2. Delete node_modules in your project folder.
3. Remove "babel-loader" from dependencies and/or devDependencies in the package.json
file in your project folder.
4. Run npm install or yarn, depending on the package manager you use.
In most cases, this should be enough to fix
the problem.
If this has not helped, there are a few other things you can try:
5. If you used npm, install yarn (http://yarnpkg.com/) and repeat the above steps with it instead.
This may help because npm has known issues with package hoisting which may get resolved in future versions.
6. Check if C:\Users\User\node_modules\babel-loader is outside your project directory.
For example, you might have accidentally installed something in your home folder.
7. Try running npm ls babel-loader in your project folder.
This will tell you which other package
(apart from the expected react-scripts) installed babel-loader.
If nothing else helps, add SKIP_PREFLIGHT_CHECK=true to an .env file in your project.
That would permanently disable this preflight check in case you want to proceed anyway.
P.S. We know this message is long but please read the steps above :-) We hope you find them helpful!
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! reg#0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the reg#0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\User\AppData\Roaming\npm-cache\_logs\2018-12-13T18_22_47_802Z-debug.log
After what it happened
$ npx create-react-app reg && cd reg && npm start
What I've tried
I tried to remove node_modules folder and package-lock.json, then run npm install.
Also installed yarn and ran yarn && yarn start.
I've recreated the app 3 times and got the same result.
Info that may be helpful
Node version: 10.8.0
NPM Version: 6.5.0
create-react-app / react-scripts: 2.1.1
babel-loader: 8.0.4
Global packages list (npm ls --depth=0 -g):
+-- create-react-app#2.1.1
+-- node-gyp#3.6.2
+-- npm#6.5.0
+-- yarn#1.12.3
package.json file:
{
"name": "reg",
"version": "0.1.0",
"private": true,
"dependencies": {
"react": "^16.6.3",
"react-dom": "^16.6.3",
"react-scripts": "2.1.1"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": [
">0.2%",
"not dead",
"not ie <= 11",
"not op_mini all"
]
}
Getting the same issue but given an hour on it get the solution
When we run npm start then you got this kind of an error that is version related issues for this issue.
Go to node_modules folder:
Project->node_modules->react-scripts->package.json
check the package.json file
there you got : "babel-loader": "8.0.4"
first remove : babel-loader folder for Project->node_modules->babel-loader
and then run npm i babel-loader#8.0.4 (it is depend on your version you can change it like : npm i babel-loader#8.0.5) after that may be you got webpack issue then follow same thing remvoe webpack from "Project->node_modules->webpack"
and reinstall npm i webpack#4.19.1
4.19.1* webpack's version it may be change..
Create a .env file in your project directory and include SKIP_PREFLIGHT_CHECK=true in the file.
On Mac:
Remove the conflicting package from /Users/<yourusername>/node_modules
However, a different version of babel-loader was detected higher up in the tree:
You should delete babel-loader package that was was detected higher up the tree. The output says there is a node_modules folder with babel-loader at..
C:\Users\user\node_modules\babel-loader (version: 8.0.2)
You may be able to delete the C:\Users\user\node_modules directory altogether as well, unless for some reason you have a project rooted there inside /Users/{user}
A few years later, the same issue.
For me, the solution was in my c:/users/myName/node_modules.
Remove that node_modules completely and try again.
You can momentarily downgrade react-scripts to 1.1.5 in the package.json file, then remove the node_modules folder and in the case of using NPM delete the package-lock.json file and in case Yarn delete the file yarn.lock.
After that, reinstall the dependencies and start the development server with the yarn start or npm run start command.
this means you install tow babel-loader
rm yarn.lock
run npm uninstall babel-loader#8.0.4
I got the same problem.
I solved it by removing folder node_modules in User/ and file package-lock.json (if exists).
It should work perfectly then.
I had this exact same issue. For anyone who finds this thread via Google and is a beginner like me. Here is exactly what to enter into your terminal(Mac User).
Say you're getting the same error that Paul was getting:
"The react-scripts package provided by Create React App requires a dependency:
"babel-loader": "8.0.6"
Here's what I entered into the terminal. I could be wrong, but this is what worked for me (I am also a beginner):
Step 1: Delete the node_modules folder as well as the package_lock.json files.
Step 2: In your terminal, type cd - (we're just getting outside of our project folder and going into your home folder)
Step 3: In your terminal type in npm i "dependency-name#number" so for the above example it would be: npm i babel-loader#8.0.6
Step 4: Now in your terminal, navigate into your project folder and type: npm install or yarn install
Step 5: Try running npm start and if all the issues have been solved, it should start the development server.
Note: I had to do the above process twice, for babel-loader#8.0.6 as well as for Webpack.
I have also problems after creating an app-project using the following commands:
create-react-app "project name"
create-react-app "project name" --use-npm
npx create-react-app.
On all cases the result was the error specified right in the top:
[There might be a problem with the project dependency tree. It is
likely not a bug in Create React App, but something you need to fix
locally.......][...]
watching on the error a line came with a small clue:
"/Users/john/node_modules/babel-loader (version: "7.1.5") -> was a
version that creates conflict with above specified - version
"babel-loader#8.0.6"
for me the solution was: following this path through my folders and delete the node_modules folder then restart again the project.
C:\Users\user\node_modules\babel-loader
Delete node_modules from \user\node_modules don't delete from your project
if you are using backend (nodejs) check if you are using webpack in your backend
make sure your create-react-app webpack and backend webpack version same
In the /home/<username>/node_modules/babel-loader directory just change in the package.json file the version to "8.0.4" in your case.
Worked for me
I got the same error with babel-loader#8.1.0, I removed the reference from package.json and also the module from node_modules and installed "npm i babel-loader#8.1.0" but then introduced #jest error.
I removed the #jest module from node_modules then installed the required dependency version as I did for babel-loader to solve the issue.
For me the same issue was resolved by adding "resolutions": {
"babel-loader": "8.1.0" //the required version
} in my package.json file.
Removed node-modules, yarn.loack, package-lock.json
yarn start
It worked perfectly fine
I was having this issue and just added in
"babel-loader": "8.0.4",
to my package.json in the dependencies and it seemed to fix the issue
I am learning to react. The version I installed is 16. I installed prop-types via npm after I got an error that 'react-scripts' is not recognized as an internal or external command, operable program or batch file."
It is an error about react-scripts file missing in your node modules directory at the time of installation.
Now, you can add manually this via the command:
npm install react-scripts
I had the same issue, resolved by simply running following command in the project root folder -
npm install react-scripts --save
If none of the above solutions works and you have already installed the "react-scripts" package
using
npm install react-scripts --save
You can try the below solution to run the application.
You should see the following in your package.json file
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
}
The script : "start": "react-scripts start" is linked to the
file : nodemon node_modules/react-scripts/scripts/start.js
which is used to start the project in the development env
Try to start the project directly using the below commands:
node node_modules/react-scripts/scripts/start.js
or if you have nodemon installed then try
nodemon node_modules/react-scripts/scripts/start.js
Hope this helps :)
If it doesn't get resolved even after running
npm install
OR
npm install react-scripts
Run:
node node_modules/react-scripts/scripts/start.js
Or use node js command-line tool and do npm install and npm start
This solved the problem for me
Simply remove node_modules folder and run npm install
I found the community answer, which is perfect solution
I just had this issue and this solution worked just fine.
run:
npm install react-scripts
that should solve it... Enjoy!!!
Just type npm install and after that run npm start. This solved the problem for me.
One of the causes of this issue is corrupted PATH and the only fix I found for that issue was to (re)install NVM and let the installer take control over the installed Node version when it asks to do so and it will fix the PATH for you. In my case that was the fix.
deleting the node_modules folder and the *.lock file then running npm install in the project directory through the terminal worked.
I tried with yarn install and it worked too after removing the mentioned files above.
It's quite common problem.
Do the following steps:-
npm audit The message will be like - 7 vulnerabilities (1 low, 6 high)
You will get the vulnerabilities, and now fix it with
npm audit fix or npm audit fix --force will prompt message like this
removed 4 packages, changed 82 packages, and audited 1623 packages in 7s
found 0 vulnerabilities
Problem Solved,
Happy Hacking
Resolved by running the following command:
yarn add react-scripts
For this error you just have to delete lock file and use command yarn
You just have to install React Script Again.
You just need to run the command npm i react-scripts and then run npm start
this error has happened to me in mern stack, and took around 3h to fix it:
in the end, this issue because the current node version is not the same I was used to creating the project for the first time. I hope this proposition helped someone in the future.
Hello I'm learning the MERN stack as well(wise use of quarantine time right? )
Anyways, I'm using WINDOWS 10, and I have the same error as well.
I tried react-scripts start and react-scripts is not recognized as an internal command
I did a bit of googling and found out that you need to
npm install react-scripts -g <- notice the -g (stands for global? I think? )
I hope this helps :>
Just go to the Terminal and on the directory which you start your server. TYPE npm install react-scripts
you will be good to go
I was trying to use 'nodemon server' then had the same error.
When I tried 'npx nodemon server', it worked.
Try to use 'npx' in front of 'npm'
Instead of writing react-scripts start just write npm start.