Export default was not found Error in JavaScript

Export default was not found Error in JavaScript #

The "export default was not found" error occurs when we try to import as default from a module that doesn't have a default export. To solve the error, make sure the module has a named export and wrap the import in curly braces, e.g. import {myFunction} from './myModule'.

Here is an example of how the error occurs. This is our index.js file.

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// 👇️ named export
export function sum(a, b) {
  return a + b;
}

And this is a file that imports the function from index.js.

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// ⛔️ Error: export default was not found
// 👇️ default import
import sum from './index';

console.log(sum(5, 5));

Notice that in our index.js file we used a named export, but when we imported the function in the other file we used a default import. This is the reason the error occurs.

To solve the "export default was not found" error, make sure:

1. To wrap named exports in curly braces when importing them.
2. Use the default keyword when exporting a value as a default export.
3. Each module only has a maximum of 1 default export but could have multiple named exports.

Here is an example of how to solve the error using a default export.

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// 👇️ default export
export default function sum(a, b) {
  return a + b;
}

And import the function in the other file.

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// 👇️ default import
import sum from './index';

console.log(sum(5, 5));

Notice that we do not use curly braces when working with default imports.

When exporting a variable as a default export, you have to declare it on 1 line and export it on the next. You can't declare and default export a variable on the same line.

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// 👇️ default export
const example = 'hello world';

export default example;

You can only have a single default export per module, but you can as many named exports as necessary.

Here is how you use named imports/exports.

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// 👇️ named export
export function sum(a, b) {
  return a + b;
}

And now we use a named import in the other file.

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// 👇️ named import
import {sum} from './index';

console.log(sum(5, 5));

Notice the curly braces. This is how we import a named export.

You can also mix and match, here's an example.

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// 👇️ named export
export const num = 33;

// 👇️ default export
export default function sum(a, b) {
  return a + b;
}

And here are the imports.

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// 👇️ default and named imports
import sum, {num} from './index';

console.log(sum(num, 25));

We used a default import to import the sum function and a named import to import the num variable.

Conclusion #

To solve the "export default was not found" error, be consistent with your ES6 imports and exports. If a value is exported as a default export, it has to be imported as a default import and if it's exported as a named export, it has to be imported as a named import.