fix: backported disabled auto importing fiber on node >= 16 (#1014)

.eslintrc.js

@@ -1,4 +1,7 @@
 module.exports = {
   root: true,
   extends: ["@webpack-contrib/eslint-config-webpack", "prettier"],
+  parserOptions: {
+    ecmaVersion: 2020,
+  },
 };

.github/workflows/nodejs.yml

@@ -55,7 +55,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [10.x, 12.x, 14.x, 16.x]
         webpack-version: [4, latest]
 
     runs-on: ${{ matrix.os }}

README.md

@@ -186,7 +186,9 @@ module.exports = {
 Note that when using `sass` (`Dart Sass`), **synchronous compilation is twice as fast as asynchronous compilation** by default, due to the overhead of asynchronous callbacks.
 To avoid this overhead, you can use the [fibers](https://www.npmjs.com/package/fibers) package to call asynchronous importers from the synchronous code path.
 
-We automatically inject the [`fibers`](https://github.com/laverdet/node-fibers) package (setup `sassOptions.fiber`) if is possible (i.e. you need install the [`fibers`](https://github.com/laverdet/node-fibers) package).
+We automatically inject the [`fibers`](https://github.com/laverdet/node-fibers) package (setup `sassOptions.fiber`) for `Node.js` less v16.0.0 if is possible (i.e. you need install the [`fibers`](https://github.com/laverdet/node-fibers) package).
+
+> Fibers is not compatible with `Node.js` v16.0.0 or later ([see introduction to readme](https://github.com/laverdet/node-fibers)).
 
 **package.json**