fix(sass!): remove fibers support

README.md

@@ -32,7 +32,6 @@
   - [Emitting processed CSS](#emitting-processed-css)
   - [CSS Modules](#css-modules)
   - [With Sass/Less/Stylus](#with-sasslessstylus)
-  - [Sass and `fibers`](#sass-and-fibers)
 - [Configuration](#configuration)
 - [Why](#why)
 - [License](#license)
@@ -230,27 +229,6 @@ Install corresponding dependency:
 
 That's it, now you can import `.scss` `.sass` `.less` `.styl` `.stylus` files in your code.
 
-### Sass and `fibers`
-
-By default, when using `Dart Sass` implementation, `fibers` package will be loaded automatically if available, otherwise sync mode will be used for better performance.
-
-> When installed via npm, `Dart Sass` supports a JavaScript API that's fully compatible with `Node Sass` <...>, with support for both the render() and renderSync() functions. <...>
->
-> Note however that by default, **renderSync() is more than twice as fast as render()** due to the overhead of asynchronous callbacks. To avoid this performance hit, render() can use the `fibers` package to call asynchronous importers from the synchronous code path.
->
-> [Source](https://github.com/sass/dart-sass/blob/master/README.md#javascript-api)
-
-To install `fibers`:
-
-```bash
-# npm
-npm install -D fibers
-# pnpm
-pnpm add -D fibers
-# yarn
-yarn add fibers --dev
-```
-
 ## Configuration
 
 See [API Reference for `Options`](https://anidetrix.github.io/rollup-plugin-styles/interfaces/types.options.html) for full list of available options.
@@ -273,7 +251,7 @@ With that said, here is the basic list of things which differentiate this plugin
 - Proper sourcemaps, with included sources content by default
 - Respects `assetFileNames` for CSS file names
 - Respects sourcemaps from loaded files
-- Support for implementation and `fibers` forcing for Sass
+- Support for implementation for Sass
 - Support for partials and `~` in Less import statements
 - More smaller things that I forgot
 

src/loaders/sass/index.ts

@@ -1,4 +1,3 @@
-import loadModule from "../../utils/load-module";
 import { normalizePath } from "../../utils/path";
 import { Loader } from "../types";
 import loadSass from "./load";
@@ -8,8 +7,6 @@ import { importer, importerSync } from "./importer";
 export interface SASSLoaderOptions extends Record<string, unknown>, sass.PublicOptions {
   /** Force Sass implementation */
   impl?: string;
-  /** Forcefully enable/disable `fibers` */
-  fibers?: boolean;
   /** Forcefully enable/disable sync mode */
   sync?: boolean;
 }
@@ -20,9 +17,7 @@ const loader: Loader<SASSLoaderOptions> = {
   async process({ code, map }) {
     const options = { ...this.options };
     const [sass, type] = loadSass(options.impl);
-    const useFibers = options.fibers ?? type === "sass";
-    const fiber = useFibers ? (loadModule("fibers") as fibers.Fiber) : undefined;
-    const sync = options.sync ?? (type !== "node-sass" && !fiber);
+    const sync = options.sync ?? type !== "node-sass";
     const importers = [sync ? importerSync : importer];
 
     if (options.data) code = options.data + code;
@@ -40,7 +35,6 @@ const loader: Loader<SASSLoaderOptions> = {
 
     // Remove non-Sass options
     delete options.impl;
-    delete options.fibers;
     delete options.sync;
 
     // node-sass won't produce sourcemaps if the `data`
@@ -61,7 +55,6 @@ const loader: Loader<SASSLoaderOptions> = {
       omitSourceMapUrl: true,
       sourceMapContents: true,
       importer: importers,
-      fiber,
     });
 
     const deps = res.stats.includedFiles;

src/shims/sass.d.ts

@@ -1,5 +1,3 @@
-/// <reference types="./fibers" />
-
 declare namespace sass {
   type Data = { file: string } | { contents: string } | Error | null;
 
@@ -16,7 +14,6 @@ declare namespace sass {
   }
 
   interface Options extends PublicOptions {
-    fiber?: fibers.Fiber;
     file?: string;
     indentedSyntax?: boolean;
     omitSourceMapUrl?: boolean;