CODEWITHSUNDEEP
javascriptreactjs
Kid_Learning_C
Kid_Learning_C

Reputation: 3603

react: can you import component with a different name?

I'm new to nodejs + react and I guess this is a basic react syntax. I'm just not used to it coming from another language. I want to confirm if I'm right:

I am trying an open react project which is successfully deployed and works for sure.

In the entry file, index.js:

...some code...

import AdminLayout from "layouts/Admin/Admin.js";

...some code...


ReactDOM.render(
  <ThemeContextWrapper>
    <BackgroundColorWrapper>
      <BrowserRouter>
        <Switch>
          <Route path="/admin" render={(props) => <AdminLayout {...props} />} />
          <Route path="/rtl" render={(props) => <RTLLayout {...props} />} />
          <Redirect from="/" to="/admin/dashboard" />
        </Switch>
      </BrowserRouter>
    </BackgroundColorWrapper>
  </ThemeContextWrapper>,
  document.getElementById("root")

For the component AdminLayout, it is imported from layouts/Admin/Admin.js. However, I checked the file and there is no variable named AdminLayout at all, layouts/Admin/Admin.js is as follows:

 ...some code...

function Admin(props) {

 ...some code...

}

export default Admin;

There is just the Admin being exported.

So, is it true that in react, you can import a component with a different name?

I did some search but cannot any description on this small detail.

Upvotes: 6

Views: 12079

Answers (1)

lbsn
lbsn

Reputation: 2412

This is actually not related to React but rather to Javascript modules.

Since the Admin component is exported as a default export:

export default Admin;

you can indeed importing it using any name.

The line: import AdminLayout from "layouts/Admin/Admin.js"; is a shorhand for import {default as AdminLayout} from "layouts/Admin/Admin.js"; where you can see more precisely what's happening there: you're importing the default exported module from Admin.js and naming it to AdminLayout.

You could as well have used a named export in your Admin.js file:

export function Admin(props) {    
 ...some code...    
}

or:

function Admin(props) {    
 ...some code...    
}

export {Admin}

In that case you must import the module using its name (and that obviously will also be the name of your React component):

    import { Admin } from "layouts/Admin/Admin.js";
    
    // In your render function you'll have at some point:
    // ... <Route path="/admin" render={(props) => <Admin {...props} />} />

But note that you can as well rename an imported named export:

  import { Admin as AdminLayout } from "layouts/Admin/Admin.js";
        
  // In your render function you'll have at some point:
  // ... <Route path="/admin" render={(props) => <AdminLayout  {...props} />} />

It is also worth noting that while you can have multiple named exports per module:

export function Foo(){};
export const bar;

you can only have a single default export.

Upvotes: 5

Related Questions