support eslint v9 (#69)

* support eslint v9

* test: make tests pass with eslint v9

* remove unneeded .eslintignore

* Add flat configurations

README.md

@@ -57,6 +57,21 @@ With this configuration, the "style" attribute is ignored for native elements fo
 
 This plugin exports a `recommended` configuration that enforce React good practices.
 
+### Flat configuration
+
+To enable this configuration add the following to your eslint.config.js:
+```js
+import reactPerfPlugin from 'eslint-plugin-react-perf';
+
+const config = [
+  reactPerfPlugin.configs.flat.recommended
+];
+
+export default config;
+```
+
+### eslintrc configuration
+
 To enable this configuration use the `extends` property in your `.eslintrc` config file:
 
 ```js
@@ -78,6 +93,21 @@ The rules enabled in this configuration are:
 
 This plugin also exports an `all` configuration that includes every available rule.
 
+### Flat configuration
+
+To enable this configuration add the following to your eslint.config.js:
+```js
+import reactPerfPlugin from 'eslint-plugin-react-perf';
+
+const config = [
+  reactPerfPlugin.configs.flat.all
+];
+
+export default config;
+```
+
+### eslintrc configuration
+
 ```js
 {
   "plugins": [

eslint.config.js

@@ -0,0 +1,26 @@
+const js = require("@eslint/js");
+const globals = require("globals");
+
+const config = [
+  js.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node,
+      },
+    },
+    rules: {
+      "space-before-function-paren": 0
+    },
+  },
+  {
+    files: ["tests/**/*.js"],
+    languageOptions: {
+      globals: {
+        ...globals.mocha
+      }
+    }
+  }
+];
+
+module.exports = config;

index.js

@@ -1,5 +1,7 @@
 "use strict";
 
+var pkg = require('./package.json');
+
 var allRules = {
   "jsx-no-new-object-as-prop": require("./lib/rules/jsx-no-new-object-as-prop"),
   "jsx-no-new-array-as-prop": require("./lib/rules/jsx-no-new-array-as-prop"),
@@ -18,7 +20,11 @@ function configureAsError(rules) {
   return result;
 }
 
-module.exports = {
+var plugin = {
+  meta: {
+    name: pkg.name,
+    version: pkg.version
+  },
   rules: allRules,
   configs: {
     recommended: {
@@ -45,3 +51,18 @@ module.exports = {
     }
   }
 };
+
+plugin.configs.flat = {
+  recommended: {
+    plugins: { "react-perf": plugin },
+    rules: plugin.configs.recommended.rules,
+    languageOptions: { parserOptions: plugin.configs.recommended.parserOptions },
+  },
+  all: {
+    plugins: { "react-perf": plugin },
+    rules: plugin.configs.all.rules,
+    languageOptions: { parserOptions: plugin.configs.all.parserOptions },
+  },
+};
+
+module.exports = plugin;

lib/utils/common.js

@@ -75,7 +75,12 @@ function findRelevantNodes(context, node) {
       return;
     }
     if (node.type === "Identifier") {
-      var variable = context.getScope().variables.find(function (variable) {
+      const sourceCode = context.sourceCode || context.getSourceCode();
+      const scope = sourceCode.getScope
+        ? sourceCode.getScope(node)
+        : context.getScope();
+
+      var variable = scope.variables.find(function (variable) {
         return variable.name === node.name;
       });
       if (variable) {