Can't reexport the named export

[tborychowski]

Hi,

Not exactly sure if this is an issue with the loader or svelte.
I have a very basic webpack setup (like in the official template repo).
Whenever import anything from svelte, e.g.:

import {onMount} from 'svelte';

I get a bunch of errors:

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'afterUpdate' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'beforeUpdate' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'createEventDispatcher' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'getContext' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'onDestroy' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'onMount' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'setContext' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

ERROR in ./node_modules/svelte/index.mjs 1:0-10:20
Can't reexport the named export 'tick' from non EcmaScript module (only default export is available)
 @ ./src/App.html
 @ ./src/index.js

[EmilTholin]

Have you manually defined the extensions array in your Webpack config? If yes, try to add .mjs before .js in that array.

[tborychowski]

Thanks @EmilTholin !
That fixed it!
I wasn't using any .mjs so I thought I can remove it :-)