Im totally new in Ts so, i was wondering if I can import all classes i have into one ts file then export it from there, so whenever i want any class i can import it directly from this file
import Login from "./Login/login_page";
import MyAccount from "./AccountSettings/myAccount_page";
import Settings from "./AccountSettings/settings_page";
import DataProvider from "../utils/data-provider/data-provider";
export default { Login, MyAccount,Settings, DataProvider};
Yes, You can do it. But there can be atmost one default export in a file. So, you can have it or not, its optional.
So, for example :
import Login from "./Login/login_page";
import MyAccount from "./AccountSettings/myAccount_page";
import Settings from "./AccountSettings/settings_page";
import DataProvider from "../utils/data-provider/data-provider";
export default DataProvider;
export { MyAccount,Settings, DataProvider} ;
or
import Login from "./Login/login_page";
import MyAccount from "./AccountSettings/myAccount_page";
import Settings from "./AccountSettings/settings_page";
import DataProvider from "../utils/data-provider/data-provider";
export {DataProvider, MyAccount,Settings, DataProvider} ;
I would like to know how to solve this problem.
You got this suddenly, and I still haven't found a solution!
my app_tsx
import type { AppProps } from "next/app";
import React from "react";
// styles
import "../node_modules/bootstrap/scss/bootstrap.scss";
import "tippy.js/dist/tippy.css";
import "tippy.js/animations/perspective-subtle.css";
import "tippy.js/themes/light.css";
import "../styles/globals.scss";
import "react-toastify/dist/ReactToastify.css";
// components
I am new in js and react,so:
i try to export js function:
App.js:
import React from 'react';
import logo from './logo.svg';
import './App.css';
import { render } from 'react-dom';
import { LazyLog } from 'react-lazylog';
import 'bootstrap/dist/css/bootstrap.min.css';
import { Dropdown } from 'react-bootstrap';
import {ApiRequests} from './ApiRequests'
var textConst="";
var lines=ApiRequests.GetMockLogLines();
textConst=lines;
And ApiRequests.js:
export function GetMockLogLines()
{
let logs=[""]
return logs;
}
So, when i compile js (o, my God) it breaks me:
Attempted import error: 'ApiRequests' is not exported from './ApiRequests'.
When i change it to :
import ApiRequests from './ApiRequests'
->
Attempted import error: './ApiRequests' does not contain a default export (imported as 'ApiRequests').
So, i just want to get function from another file. What i do wrong?
And what difference between {} and without it? (you can send me a link start to read,pls).
There is no function named Apirequests in your file. The function you are exporting is GetMockLogLines()
So your import should be
import {GetMockLogLines} from './ApiRequests'
As for the importing difference betweent {} and without the curly braces is how you are exporting your stuff from your file. There are two types of exports - Default export and named exports. One can have only one default export per file and it has to be imported without the curly braces.
You can read more here - https://medium.com/#etherealm/named-export-vs-default-export-in-es6-affb483a0910
you need to import GetMockLogLines directly as it is a named import.
change your code to the following.
import { GetMockLogLines } from './ApiRequests'
var lines=GetMockLogLines();
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';
I am trying to figure out why TypeScript is not picking up the "default export" of react. E.g. in my JavScript files I was using:
import React from 'react';
import ReactDOM from 'react-dom';
But in typescript I have to use (after some googling):
import * as React from "react"
import * as ReactDOM from "react-dom"
I am just starting out with a fresh project after being unable to import my existing project and g et VS2k15 to compile it.
What is the difference, if any? Is there a way to specify a "Module 'react' has no default export".
I can see in the React file there is
declare module "react" {
export = __React;
}
Is that not considered a default export
I also tried
import __React from "react"
but get the same error.
A default export is just giving one of the exports the alias "default". You can do this using the following syntax:
export default function __React {
//do work
}
You can also use the following syntax:
function __React {
//do work
}
export {__React as default};