I don't know how to solve this problem.
When I started project vue3.js , console show me this error.
This import in pinia store.
I tryied change first line with import to
"import Vue from 'vue';" (without curcy braces), but error don't disappear.
import { Vue } from 'vue';
import { defineStore } from 'pinia';
import moment from 'moment';
import _ from 'lodash';
import router from '#/router';
if you are using latest version of vue , vue3
this code
import { Vue } from 'vue';
is no longer global instance
Mine react-navigation drawer is not working, I am getting this error while running the app, any suggestion to fix this problem.
Unable to resolve "react-navigation-drawer" from "App.js"
import React from 'react';
import {createAppContainer} from 'react-navigation';
import {createDrawerNavigator} from 'react-navigation-drawer';
import {Dimensions} from 'react-native';
import {Feather} from 'expo/vector-icons'
import { ProfileScreen, MessageScreen, ActivityScreen, ListScreen, ReportScreen, StatisticsScreen, SignoutScreen} from './screens';
const DrawerNavigator = createDrawerNavigator({
ProfileScreen,
MessageScreen,
ActivityScreen,
ListScreen,
ReportScreen,
StatisticsScreen,
SignoutScreen
})
export default createAppContainer(DrawerNavigator);
You haven't installed react-navigation-drawer in your project and you are trying to use it.
run yarn add react-navigation-drawer inside your project directory then it should work.
I am totally new to React and i'm following tutorials (Programming with MOSH) in youtube but i'm stuck with this error, unable to resolve after finding similar questions.
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
import "bootstrap/dist/css/bootstrap.css";
import Counter from './components/counter';
//import * as Counter from './components/counter'; //tried this method too
ReactDOM.render(
<Counter />,
document.getElementById('root')
);
// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
serviceWorker.unregister();
counter.jsx
import React, { Component } from 'react';
class Counter extends Component {
render() {
return <h1> Hello world</h1>;
}
}
export default Counter;
in command prompt i had done npm install and npm start after deleting package-lock.json but still the same error
folder structure
Thanks in advance.
Move your components folder inside the SRC this will fix it
Either move components folder inside src folder or change the reference in the import statement to '../component/counter'
index.html
<html>
<head>
<title>Webpack and React</title>
<link href="https://maxcdn.bootstrapcdn.com/bootswatch/3.3.6/cerulean/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div id="app">hello</div>
<script src="index.js"></script>
</body>
</html>
index.js
import React from "react";
import ReactDom from "react-dom";
import {BrowserRouter as Router, Route} from "react-router";
import Layout from "./pages/Layout";
import Featured from "./pages/Featured";
import Archives from "./pages/Archives";
import Settings from "./pages/Settings";
const app = document.getElementById('app');
ReactDom.render(
<Router>
<Route path = "/" component={Layout}/>
</Router>,
app);
Layout.js
import React from "react";
export default class Layout extends React.Component{
render(){
return(
<div>
<h1>Discussion Board</h1>
</div>
);
}
}
I follow the online example to learn react router with webpack but it shows the error:
Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a
class/function (for composite components) but got: undefined. You likely forgot to export your
component from the file it's defined in, or you might have mixed up default and named imports.
I cannot find what reason to cause the error. Someone said that I might not add the export default but I have already added it. It is still error.
Your import
import {BrowserRouter as Router, Route} from "react-router";
should be
import {BrowserRouter as Router, Route} from "react-router-dom";
A note from the react-router npm package page:
Note: This package provides the core routing functionality for React Router, but you might not want to install it directly. If you are writing an application that will run in the browser, you should instead install react-router-dom. Similarly, if you are writing a React Native application, you should instead install react-router-native. Both of those will install react-router as a dependency.
I have the same error as this answer, except instead of it just occurring in one file it is occurring in many; once I fix it for one file, another just pops up with the same error. I've seen this answer but whenever I run react-scripts start a node_modules folder is created in my src, so that solution isn't viable.
It would be too time consuming to have to fix every file that has this error every time I compile, so how can I get rid of this error? It seems to just be an eslint issue.
you will get this error if you declare variable in between your imports,
import React from 'react';
import axios from 'axios';
const URL = process.env.REACT_APP_API_BASE;
import demoXLXSFile from '../../assets/others/Demo.xlsx';
import './student.list.styles.scss';
declare variables after importing everything,
import React from 'react';
import axios from 'axios';
import demoXLXSFile from '../../assets/others/Demo.xlsx';
import './student.list.styles.scss';
const URL = process.env.REACT_APP_API_BASE;
I found this issue while I was using React.lazy in my existing project. I got this error Failed to compile. :- Import in body of module; reorder to top import/first (with create-react-app).
import React from 'react';
import SelectField from '../inputs/SelectField';
const Questions = React.lazy(() => import('./questions'))
import _ from 'lodash';
Solution:-
Only reorder the position i.e. put all import on top then react.lazy.
import React from 'react';
import SelectField from '../inputs/SelectField';
import _ from 'lodash';
const Questions = React.lazy(() => import('./questions'))
I got this same error when I added an extra semicolon ';' at the end of an import statement.
I suggest removing any extraneous semicolons. This should make the error go away.
Moving every import statement to the top of the file solves the issue.
Happened to me when I put require before import like this:
require('dotenv').config()
import React from 'react';
import ReactDOM from 'react-dom';
...
Solution: Put the require after the imports
If You are using Component Lazy loading then always put lazy load component import code below normal import code.
Correct Example
import First from './first'
const Second = React.lazy(()=>import("./Second))
Incorrect Example
const Second = React.lazy(()=>import("./Second))
import First from './first'
I came across this issue too. I found that you must import all ES6 modules at the top level of your JavaScript files."... the structure of ES6 modules is static, you can’t conditionally import or export things. That brings a variety of benefits.
This restriction is enforced syntactically by only allowing imports and exports at the top level of a module:"
From Dr. Axel Rauschmayer’s Exploring JS:
Wrong
1.
import React ,{useState ,useEffect} from 'react';
import './App.css';
import Post from './Post';
import db from "./firebase"
Right
2.
import React ,{useState ,useEffect} from 'react';
import './App.css';
import Post from './Post';
import db from "./firebase.js"
//this is code firebase.js
const db = firebaseApp.firestore();
const auth = firebase.auth();
const storage = firebase.storage();
export default {db,auth,storage};
When I change the firebase into firebase.js in Snippet 2.
My Error vanished
I had forgotten to add from.
Before:
import UpperBlock;
After:
import UpperBlock from "../components/dashboard/shared/UpperBlock";
Make sure you import well your component and then stop the server and restart it again. It worked for me.
I forgot to add {Component} after importing 'react' library to my project, this solved my issue.
Move all of your imports to the top of the file.
Even in case of a require (that is written in between import statements), this error will come.
e.g.
import 'some_module';
require('some_file');
import 'some_other_module');
This would result in an error.
You would want to do this instead:
import 'some_module';
import 'some_other_module');
require('some_file');
I was facing the same issue when I installed chat.js library in my reactJs project. I solved this issue by moving my chart.Js import to the index.js file
index.js file:
import React from "react";
import ReactDOM from "react-dom";
import { Chart as ChartJS, ArcElement, Tooltip, Legend } from "chart.js"; <--- imported
import "./index.css";
import App from "./App";
ChartJS.register(ArcElement, Tooltip, Legend); <---- imported
If you're experiencing this error in modern versions of react(current version 18.0.0) make sure you're making all your imports before the ReactDOM.createRoot declaration.
For example, I got the error with:
import App from "./App";
import reportWebVitals from "./reportWebVitals";
const root = ReactDOM.createRoot(document.getElementById("root"));
import { Provider } from "./context";
This will result in an error. Instead, import everything before the createRoot:
import App from "./App";
import reportWebVitals from "./reportWebVitals";
import { Provider } from "./context";
const root = ReactDOM.createRoot(document.getElementById("root"));
This will fix the error. Simple fix but it's easy to miss
If I put double Semicolon behind the importing statement than I got "error".you can see difference between two pictures in import './index.css'; is different
For Example :-
import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';;
import 'tachyons';
import {robots} from "./Robots";
import reportWebVitals from './reportWebVitals';
import CardList from './CardList';