Rewrite sorting rule and utilities (#18)

Copied a bunch of the sorting utilities from [eslint-plugin-perfectionist](https://perfectionist.dev) (thanks for the great plugin, @azat-io!) which should make things easier to follow, and possibly sort out a few hard-to-nail-down issues.

Fixes #16, #17

.changeset/quick-kangaroos-stare.md

@@ -0,0 +1,6 @@
+---
+"eslint-plugin-import-sorting": minor
+---
+
+Group unassigned imports at the top
+Unassigned imports are grouped together, but not sorted in case of potential side-effects.

.changeset/slimy-dancers-own.md

@@ -0,0 +1,8 @@
+---
+'eslint-plugin-import-sorting': major
+---
+
+Remove deprecated settings
+
+-   `import-sorting/known-framework` should be changed to `import-sorting/framework-patterns`
+-   `import-sorting/known-first-party` should be changed to `import-sorting/internal-patterns`

.changeset/tame-actors-move.md

@@ -0,0 +1,6 @@
+---
+'eslint-plugin-import-sorting': minor
+---
+
+Include Bun runtime modules in `builtin` group
+Since some builtin modules require a `bun:` or `node:` protocol prefix while others do not, sorting ignores the protocol prefix. (Including it consistently is recommended)

.changeset/tough-geckos-doubt.md

@@ -0,0 +1,6 @@
+---
+'eslint-plugin-import-sorting': minor
+---
+
+Include additional extensions in `style` group
+The `style` group now matches imports of Less, Sass, Stylus, and more.

README.md

@@ -4,18 +4,53 @@ Enforce a convention in the order of `import` statements, inspired by [isort](ht
 
 1. Node standard modules
 2. Framework modules
-3. Third-party modules
-4. First-party modules
+3. External modules
+4. Internal modules
 5. Explicitly local modules
 
 This plugin includes an additional group for “style” imports where the import source ends in `.css` or other style format. Imports are sorted alphabetically, except for local modules, which are sorted by the number of `.` segements in the path first, then alphabetically.
 
 ## Usage
 
+Install the plugin, and ESLint if is not already.
+
+```sh
+npm install --save-dev eslint eslint-plugin-import-sorting
+```
+
+Include the plugin in the `plugins` key of your ESLint config and enable the rule.
+
+```js
+// eslint.config.js
+
+import importSortingPlugin from 'eslint-plugin-import-sorting'
+
+export default [
+	{
+		plugins: {
+			'import-sorting': importSortingPlugin,
+		},
+		rules: {
+			'import-sorting/order': 'warn',
+		},
+	},
+]
+```
+
+<details>
+	<summary>Legacy config example</summary>
+
 ```js
-rules: {
-	'import-sorting/order': 'error',
+// .eslintrc.js
+
+module.exports = {
+	plugins: ['import-sorting'],
+	rules: {
+		'import-sorting/order': 'warn',
+	},
 }
 ```
 
+</details>
+
 See the [order](https://github.com/stormwarning/eslint-plugin-import-sorting/blob/main/docs/rules/order.md) rule docs for more configuration options.

docs/rules/order.md

@@ -4,21 +4,31 @@
 
 Enforce a convention in the order of `import` statements.
 
+The grouping order is as follows:
+
+1. Unassigned imports (only grouped, existing order is preserved)
+2. Node/Bun standard modules (protocol is ignored when sorting)
+3. Framework modules (see below)
+4. External modules
+5. Internal modules (see below)
+6. Explicitly local modules (paths starting with a dot segment)
+7. Style imports
+
 ## Settings
 
-The framework and first-party groups can be configured by passing a RegEx
+The framework and internal groups can be configured by passing a RegEx
 string to the different plugin setting. This allows the rule itself to be
 implemented by a shared config, while individual projects can determine what
-constitutes a “first-party” module.
+constitutes an “internal” module.
 
 For example:
 
 ```js
 settings: {
 	// Group official React packages together.
-	'import-sorting/known-framework': /^react(\/|-dom|-router|$)/.source,
+	'import-sorting/framework-patterns': /^react(\/|-dom|-router|$)/.source,
 	// Group aliased imports together.
-	'import-sorting/known-first-party': /^~/.source,
+	'import-sorting/internal-patterns': /^~/.source,
 },
 rules: {
 	'import-sorting/order': 'error',