Incompatibility with latest node-sass and sass package versions

[silverbackdan]

Bug report

When building with Vercel (and not locally) there is an issue with the types declaration causing an error

Actual Behavior

This is what shows in the output logs

FATAL  Nuxt build error
--
17:49:44.987 |  
17:49:44.987 | ERROR in node_modules/@types/sass-loader/interfaces.d.ts
17:49:44.987 | ERROR in node_modules/@types/sass-loader/interfaces.d.ts(410,43):
17:49:44.987 | 410:43 Generic type 'Options<sync>' requires 1 type argument(s).
17:49:44.987 | 408 \|     type Callback<T> = (loaderContext: Webpack.loader.LoaderContext) => T;
17:49:44.988 | 409 \|
17:49:44.988 | > 410 \|     type SassOptions = NodeSass.Options \| Sass.Options;
17:49:44.988 | \|                                           ^
17:49:44.988 | 411 \| }
17:49:44.988 | 412 \|

Expected Behavior

The build should work

How Do We Reproduce?

I would love to give a concise reproduction. However when building locally I could not replicate this. All I can see is in the Vercel builder, which is also using Node 14.x, when I use sass v1.45 which was released 10 days ago (and I tried with the latest node-sass instead as well) I get this error. If I use sass v1.44 it does not happen.

Please paste the results of npx webpack-cli info here, and mention other relevant information

I'm afraid I can't because this is a closed system in Vercel carrying out the build and it does not happen locally.. I know this makes it difficult and perhaps very hard to trace the issue. I'm sorry for this and understand if it means you are not able to look into it further.

In case the issue is with the builder package running I've also opened an issue on that repo here: nuxt/vercel-builder#645

I'm afraid this is not my area of expertise but whatever I can do to try and help, please reach out.

Thanks.

[alexander-akait]

But it is typescript problem, we don't have types for sass here and can't fix it, sorry

[alexander-akait]

Maybe sass command change own types and before it was not generic, now it is generic, I think better to open an issue in sass (dart-sass) repo

[silverbackdan]

OK thank you, I'll try there.

[silverbackdan]

Although.. I see the types are in a dir node_modules/@types/sass-loader - is there any clues why there would be types in an sass-loader dir?

[alexander-akait]

We don't have types here yet, if you have problems with types from node_modules/@types/sass-loader, please open an issue in https://github.com/DefinitelyTyped/DefinitelyTyped

[alexander-akait]

The problem here https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/sass-loader/interfaces.d.ts#L410

[silverbackdan]

Brill, thanks very much!