Find file path from a named import in ES6 - javascript

I'm trying to obtain the file where a named import is loaded in ES6. Let's say i have
import React, {Component} from 'react';
const dummy = () => (
<div>
Hello!
</div>
);
export default dummy;
I'm processing this file and trying to find out from which file the Component import is loaded. As far as i research, i can use require.resolve(), but it only tells me the index file from a module. What i want to know is from which file a named import is loaded... Any idea?

Related

how to import json data file and use it in a react component?

I'm new to react and confused about how to import, export, and render components. I have a fakeData.json file located in the same src/components folder as the component I'm trying to render. Here is the index.html
<body>
<div id="root"></div>
</body>
Here is the index.js
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
ReactDOM.render(
<React.StrictMode>
<App />
</React.StrictMode>,
document.getElementById('root')
);
Here is the app.js
import './App.css';
import './components/WatchlistTable.js';
import 'rsuite/lib/styles/index.less';
function App() {
return <WatchlistTable />
}
export default App;
Here is where I get confused in src/components/WatchlistTable.js. It is a rsuite table. I try to import the fakeData.json file, which is located in the same components folder, like this:
import fakeData from 'fakeData.json';
But it gives error like "Module not found: Can't resolve fakeData.json". So I try another way.
import {fakeData} from 'fakeData.json';
But it gives same error. In the Visual Studio Code editor I notice message like: "there is no fakeData.json in the public folder."
So I make a copy and put it there. Now VSC error disappears but other error remains.
The fakeData.json file looks like this:
[
{
"id": 1,
"avartar": "url/128.jpg",
blah blah blah...
},
]
So I try another way. I change fakeData.json in components folder to fakeData.js and add
const fakeData = [
But same error. So I try:
const fakeData = require('fakeData.js');
But same error. Suggestions?
EDIT: Per Ridik, I now have this in WatchlistTable.js
import React from 'react';
import fakeData from 'fakeData';
And I have
export default fakeData;
at the end of the fakeData.js file. But still getting same error:
./src/components/WatchlistTable.js
Module not found: Can't resolve 'fakeData' in
'C:\Users\Greg\Projects\react-demos\backtester-rsuite\src\components'
You can not directly import your json array from the JSON file in react. To achieve that you must store your JSON array in a variable and then export default your JSON array. By Doing this you can easily import it in your component.
FakeData.js
const fakeData = [
{
"id": 1,
"avartar": "url/128.jpg",
blah blah blah...
},
]
export default fakeData // you must export it to use in another file.
Then in any component use it like
import fakeData from './Destination_of_file/fakeData.js'
or
Way 2 // recomended
import fakeData from './Destination_of_file/fakeData'
In your import statement you have to provide the relative path of the file. Otherwise it looks into public directory in your project. And also instead of using named import syntax use default import syntax. i.e., in your case use below statement to import that json file in your component.
import jsonFile from "./fakeData.json";

How to import self-made component into index.js in React

I'm learning react and i'm stuck on how to import a self-made component.
So I made this into src/components/Part/Part.jsx
And in my index.js file I import this like that import { Part } from './components/Part/Part.jsx';
const Part = (props) =>{
return (
<p>{props.part + " " + props.exec}</p>
)
}
export default Part
In your import statement remove curly brackets. It will work then. :)
Update this:
import { Part } from './components/Part/Part.jsx';
To:
import Part from './components/Part/Part.jsx';
For better understanding read named exports and default exports here:
https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export
If your folder structure like -
src
|_components
|__Part
|__Part.jsx
|__index.js
And want to export the Part.jsx from index.js then you can write this line into the index.js file.
// At src/components/Part/index.js file
export {default} from './Part.jsx';
And now you can import the Part component from anywhere like-
import Part from 'path/to/components/Part';
Update: You can follow the structure this allows you to import the component like import Part from './components/Part' instead of import Part from './components/Part/Part.jsx'.

import all variables from a file.js with an " import './file.js' " summoning

I'm working with the import function, I wish use an import like for css, I mean "import './file.css'" then all the css attributes are diffused in the file. I have tried the same with ReactJS but it fails.
My expectation is to imitate the css import for js files, but it doesn't work.
Here my sandbox
Here is the relevant code:
import React from "react";
import ReactDOM from "react-dom";
impoprt sample from "./sample"
import "./exported.js";
import "./styles.css";
function App() {
return (
<div className="App">
<h1>Hello CodeSandbox</h1>
<h2>Start editing to see some magic happen!</h2>
{sample[2]}
{text1}
</div>
);
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
I'm getting the error at the line when no using the star's import:
{text1}
I'm wondering how make something similar. Any hint would be great,
thanks
The offending code in your sandbox is: import "./exported.js";
One source of confusion is that you are using Create React App, which hides away the webpack magic which allows you to import your CSS files as import "./styles.css";.
This is not how module exports and imports work. I would recommend reading the section on exporting and importing details on exploringjs.com
What you are doing is essentially an empty import, i.e. you are not importing anything, just executing the file.
Empty import: only loads the module, doesn’t import anything. The
first such import in a program executes the body of the module.
import 'src/my_lib';
But here are various ways to import something in a nutshell.
Assumption: your ./exported.js file has the following exports:
// some other code
export { text1, text2 };
export default config;
Then you can import them in various formats
// import only the default export
import config from './exported.js';
// This only imports the export qualified with default, it ignores others
// i.e.
console.log(config); //works
console.log(text1); // fails
console.log(text2); // fails
// import everything the module exports, but as a namespace
import * as myLib from './exported.js';
// usage: all named exports are properties of the myLib object
console.log(myLib.text1); // works
console.log(myLib.text2); // works
console.log(myLib.config); // should not work, unless you have also exported config as a named export
// import only what you need
import { text1, text2 } from './exported.js';
console.log(text1); // works
console.log(text2); // works
// you can also rename them
import { default as x, text1 as a, text2 as b } from './exported.js';
console.log(x); // works --> config
console.log(a); // works --> text1
console.log(b); // works --> text2
You need to do import defaultExport from 'moduleName'; so you can use defaultExport in your code.
Doing import 'moduleName'; will only run the code in the module but not import anything (see MDN for more info)
In your sandbox, doing import sample from 'sample.js'; would do it.
The problem in your code cause a breaking a import, that didn't let include your css file, the problem is importing export.js and sample.js it must include using a correct Destructuring, e.g.:
import React from "react";
import ReactDOM from "react-dom";
import { text1, text2 } from "./exported.js";
import sample from "./sample.js";
import "./styles.css";
Here complete sample Code Sample.
More info about import statement: import
Destructuring assignment statement: destructuring assignment .
Best regards.

Javascript how to export modules inside groups

I´ve several React components as a library in folder ux (some itens below):
import MessageBar from "./atoms/MessageBar/MessageBar";
import Spinner from "./atoms/Spinner/Spinner";
import Button from "./atoms/Button/Button";
import AccordionHeader from "./molecules/AccordionHeader/AccordionHeader";
import AutocompleteList from "./molecules/AutocompleteList/AutocompleteList";
import ButtonGroup from "./molecules/ButtonGroup/ButtonGroup";
import LoginPanel from "./organisms/LoginPanel/LoginPanel";
import WelcomePanel from "./organisms/WelcomePanel/WelcomePanel";
I wish to export these objects so that it can be imported from its group:
import LoginPanel from "ux.organisms";
Or
import Button from "ux/atoms";
Or whatever.
The idea is that you are getting the element from an specific group inside ux library.
What is the suggested way to export all of those components, organized into groups (atoms, molecules, organisms, etc.) ?
PS:
a. I don´t wnat to change the component name (ButtomAtom, etc...)
b. The result will be a npm library to be imported by other projects. So, this code will reside on my ux/index.js file.
Then make a index.js file at ux/atoms/ and fill it with:
import MessageBar from "./MessageBar/MessageBar";
import Spinner from "./Spinner/Spinner";
import Button from "./Button/Button";
//...
export { MessageBar, Spinner, Button };
So now one can do:
import { MessageBar } from "ux/atoms";
Or if you need every submodule:
import * as Atoms from "ux/atoms";

How to import packages inside .vue files

In my .vue file script area, I have this:
<script>
import get from 'lodash.get';
...
</script>
I'm trying to import lodash.get, but I get ReferenceError: get is not defined.
In my entry file(app.js which is a normal js file) it works and I could do
import get from 'lodash.get';
window.get = get;
But it would be better to have imports in each component.
Is there a way to import packages(lodash.get in my example) inside a
vue component?
My folder structure:
node_modules
..lodash.get
....index.js
resources
..assets
....js
......components
........ComponentWhereINeedImport.vue
....app.js
None of these work:
import { get } from 'lodash/get';
import { get } from 'lodash.get';
import get from 'lodash/get';
import get from 'lodash.get';
require('../../../../node_modules/lodash.get/index.js');
require('../../../../node_modules/lodash.get/index');
require('../../../../node_modules/lodash.get');
Just write
<script>
import lodash from 'lodash';
....

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