Utilizing one-line code, import and export modules in Next.js

I'm currently developing a NextJs application and encountered an issue with the header folder, which contains a Header.jsx file with a default export Header.

In the same directory, there is an index.js file with the following code:

export * from './Header'

However, when I try to use it, an error occurs:

Attempted import error: '../components/header' does not contain a default export (imported as 'Header').

If instead I use:

import Header from './Header'

export default Header

Everything works smoothly. Is there a way in NextJs to utilize the single-line export method without encountering this repetition?

Thank you

javascriptbabeljsnext.jses6-modules

Answer №1

Named Export vs Default Export in ES6 Modules

  • When using ES6 modules, you have two options for exporting a module: named export and default export.

  1. Named Export: (export)

    • You can include multiple named exports within a single file.
    // Example in ./AllComponents.js

export const Comp1= () => {}
export const Comp2= () => {}

//In another file, like ./SomeComponent.js
// Importing a single named export
import { Comp1 } from "./AllComponents";
// Importing multiple named exports
import { Comp1, Comp2} from "./AllComponents";
// Giving a named import a different alias using "as":
import { Comp1 as MyCustomName } from "./AllComponents";

  • You can also import all of the named exports as one object

    import * as MainComponents from "./AllComponents";
// Access components as MainComponents.Comp1 and MainComponents.Comp2

Default Export: (export default)

  • In contrast to named exports, only ONE default export is allowed per file.
  • When importing a default export, remember to use the following syntax:
// File 1: Creating and exporting MyComponent
const MyComponent = () => {}
export default MyComponent;

// File 2: Importing the component in another file
import DefaultExportFromAComponent from "./DefaultExportFromAComponent";

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