feat: support eslint 9

 Add flat config preset

Author: Smrtnyk

README.md

@@ -80,6 +80,39 @@ The available configuration presets to choose from:
 
 It's important to note that you can still override any of the preset rule definitions in your configuration. Think of these presets as convenience "defaults" that can still be customized.
 
+### Flat Config
+
+If you're using ESLint's newer flat config format, you can use the plugin's flat configuration preset:
+
+```js
+// eslint.config.js
+import properArrows from "@getify/eslint-plugin-proper-arrows";
+
+export default [
+    properArrows.flatConfigs["CONFIG-PRESET-NAME"], // i.e., "getify-says", etc
+    // ... other configs
+];
+```
+
+This will automatically load the plugin and apply the recommended preset rules configuration.
+The preset includes the same rules configuration as the traditional `"extends": ["plugin:@getify/proper-arrows/CONFIG-PRESET-NAME"]` format.
+
+You can still override any of the preset rules in your configuration after including the flat config:
+
+```js
+import properArrows from "@getify/eslint-plugin-proper-arrows";
+
+export default [
+    properArrows.flatConfigs["getify-says"],
+    {
+        rules: {
+            "@getify/proper-arrows/params": ["error", {"unused": "none"}],
+            // ... other rule overrides
+        }
+    }
+];
+```
+
 ### `.eslintrc.json`
 
 To load the plugin and enable its rules via a local or global `.eslintrc.json` configuration file:
@@ -97,6 +130,25 @@ To load the plugin and enable its rules via a local or global `.eslintrc.json` c
 }
 ```
 
+For users of ESLint's newer flat config format, the configuration would look like this:
+
+```js
+import properArrows from "@getify/eslint-plugin-proper-arrows";
+
+{
+    plugins: {
+        "@getify/proper-arrows": properArrows
+    },
+    rules: {
+        "@getify/proper-arrows/params": ["error",{"unused":"trailing"}],
+        "@getify/proper-arrows/name": ["error",{"trivial":false}], 
+        "@getify/proper-arrows/where": ["error",{"global":true}],
+        "@getify/proper-arrows/return": ["error",{"object":true}],
+        "@getify/proper-arrows/this": ["error","always",{"no-global":true}]
+    }
+}
+```
+
 ### `package.json`
 
 To load the plugin and enable its rules via a project's `package.json`:

lib/index.js

@@ -1,17 +1,21 @@
 "use strict";
 
-module.exports = {
+var presetRulesConfig = {
+	"getify-says": {
+		"@getify/proper-arrows/params": [ "error", { "unused": "trailing", "count": 2, "length": 3, "allowed": [ "e", "v", "cb", "fn", "pr", ], }, ],
+		"@getify/proper-arrows/name": "error",
+		"@getify/proper-arrows/return": [ "error", { "ternary": 1, }, ],
+		"@getify/proper-arrows/where": "error",
+		"@getify/proper-arrows/this": [ "error", "nested", { "no-global": true, }, ],
+	}
+};
+
+var plugin = {
 	configs: {
 		"getify-says": {
 			plugins: [ "@getify/proper-arrows", ],
-			rules: {
-				"@getify/proper-arrows/params": [ "error", { "unused": "trailing", "count": 2, "length": 3, "allowed": [ "e", "v", "cb", "fn", "pr", ], }, ],
-				"@getify/proper-arrows/name": "error",
-				"@getify/proper-arrows/return": [ "error", { "ternary": 1, }, ],
-				"@getify/proper-arrows/where": "error",
-				"@getify/proper-arrows/this": [ "error", "nested", { "no-global": true, }, ],
-			},
-		},
+			rules: presetRulesConfig["getify-says"],
+		}
 	},
 	rules: {
 		"params": {
@@ -636,6 +640,16 @@ module.exports = {
 	},
 };
 
+plugin.flatConfigs = {
+	"getify-says": {
+		name: "getify-says",
+		plugins: {
+			"@getify/proper-arrows": plugin
+		},
+		rules: presetRulesConfig["getify-says"],
+	}
+}
+
 
 // ***************************
 
@@ -837,3 +851,5 @@ var getAncestors = (context, sourceCode, node) => {
 	);
 	return getAncestors(context, sourceCode, node);
 };
+
+module.exports = plugin;