fix: use @eslint/compat to fix eslint v9 + react plugin

lib/config-generator.js

@@ -28,9 +28,10 @@ export class ConfigGenerator {
         this.packageJsonPath = options.packageJsonPath || findPackageJson(this.cwd);
         this.answers = options.answers || {};
         this.result = {
-            devDependencies: [],
+            devDependencies: ["eslint@9.x"],
             configFilename: "eslint.config.js",
-            configContent: ""
+            configContent: "",
+            installFlags: ["-D"]
         };
     }
 
@@ -72,6 +73,19 @@ export class ConfigGenerator {
                     { message: "None of these", name: "none" }
                 ]
             },
+            {
+                type: "select",
+                name: "eslintVersion",
+                message: "The React plugin doesn't officially support ESLint v9 yet. What would you like to do?",
+                initial: 0,
+                choices: [
+                    { message: "Install ESLint v9.x with compatibility utilities", name: "9.x" },
+                    { message: "Install ESLint v8.x", name: "8.x" }
+                ],
+                skip() {
+                    return this.state.answers.framework !== "react";
+                }
+            },
             {
                 type: "select",
                 name: "language",
@@ -166,9 +180,18 @@ const compat = new FlatCompat({baseDirectory: __dirname, recommendedConfig: plug
         }
 
         if (this.answers.framework === "react") {
-            this.result.devDependencies.push("eslint-plugin-react");
-            importContent += "import pluginReactConfig from \"eslint-plugin-react/configs/recommended.js\";\n";
-            exportContent += "  pluginReactConfig,\n";
+            if (this.answers.eslintVersion === "9.x") {
+                this.result.devDependencies.push("eslint-plugin-react", "@eslint/compat");
+                this.result.installFlags.push("--force");
+                importContent += "import pluginReactConfig from \"eslint-plugin-react/configs/recommended.js\";\n";
+                importContent += "import { fixupConfigRules } from \"@eslint/compat\";\n";
+                exportContent += "  ...fixupConfigRules(pluginReactConfig),\n";
+            } else if (this.answers.eslintVersion === "8.x") {
+                this.result.devDependencies[0] = "eslint@8.x";
+                this.result.devDependencies.push("eslint-plugin-react");
+                importContent += "import pluginReactConfig from \"eslint-plugin-react/configs/recommended.js\";\n";
+                exportContent += "  pluginReactConfig,\n";
+            }
         }
         if (this.answers.config) {
             const config = this.answers.config;
@@ -179,7 +202,19 @@ const compat = new FlatCompat({baseDirectory: __dirname, recommendedConfig: plug
             const peers = fetchPeerDependencies(config.packageName);
 
             if (peers !== null) {
-                this.result.devDependencies.push(...peers);
+                const eslintIndex = peers.findIndex(dep => (dep.startsWith("eslint@")));
+
+                if (eslintIndex === -1) {
+                    // eslint is not in the peer dependencies
+
+                    this.result.devDependencies.push(...peers);
+                } else {
+
+                    // eslint is in the peer dependencies => overwrite eslint version
+                    this.result.devDependencies[0] = peers[eslintIndex];
+                    peers.splice(eslintIndex, 1);
+                    this.result.devDependencies.push(...peers);
+                }
             }
 
             if (config.type === "flat" || config.type === void 0) {
@@ -198,11 +233,6 @@ const compat = new FlatCompat({baseDirectory: __dirname, recommendedConfig: plug
             this.result.devDependencies.push("@eslint/eslintrc", "@eslint/js");
         }
 
-        const hasEslint = this.result.devDependencies.some(dep => (/^eslint(@|$)/u.test(dep)));
-
-        if (!hasEslint) {
-            this.result.devDependencies.push("eslint");
-        }
         this.result.configContent = `${importContent}
 ${needCompatHelper ? helperContent : ""}
 export default [\n${exportContent}];`;
@@ -238,7 +268,7 @@ export default [\n${exportContent}];`;
             })).packageManager;
 
             log.info("☕️Installing...");
-            installSyncSaveDev(this.result.devDependencies, packageManager);
+            installSyncSaveDev(this.result.devDependencies, packageManager, this.result.installFlags);
             await writeFile(configPath, this.result.configContent);
 
             // import("eslint") won't work in some cases.

lib/utils/npm-utils.js

@@ -47,12 +47,13 @@ function findPackageJson(startDir) {
  * Install node modules synchronously and save to devDependencies in package.json
  * @param {string|string[]} packages Node module or modules to install
  * @param {string} packageManager Package manager to use for installation.
+ * @param {string[]} installFlags Flags to pass to the package manager.
  * @returns {void}
  */
-function installSyncSaveDev(packages, packageManager = "npm") {
+function installSyncSaveDev(packages, packageManager = "npm", installFlags = ["-D"]) {
     const packageList = Array.isArray(packages) ? packages : [packages];
     const installCmd = packageManager === "yarn" ? "add" : "install";
-    const installProcess = spawn.sync(packageManager, [installCmd, "-D"].concat(packageList), { stdio: "inherit" });
+    const installProcess = spawn.sync(packageManager, [installCmd, ...installFlags].concat(packageList), { stdio: "inherit" });
     const error = installProcess.error;
 
     if (error && error.code === "ENOENT") {

tests/__snapshots__/config@eslint-config-airbnb

@@ -15,13 +15,16 @@ export default [
 ];",
   "configFilename": "eslint.config.mjs",
   "devDependencies": [
-    "eslint-config-airbnb",
     "eslint@^7.32.0 || ^8.2.0",
+    "eslint-config-airbnb",
     "eslint-plugin-import@^2.25.3",
     "eslint-plugin-jsx-a11y@^6.5.1",
     "eslint-plugin-react@^7.28.0",
     "eslint-plugin-react-hooks@^4.3.0",
     "@eslint/eslintrc",
     "@eslint/js",
   ],
+  "installFlags": [
+    "-D",
+  ],
 }

tests/__snapshots__/config@eslint-config-airbnb-base

@@ -15,10 +15,13 @@ export default [
 ];",
   "configFilename": "eslint.config.mjs",
   "devDependencies": [
-    "eslint-config-airbnb-base",
     "eslint@^7.32.0 || ^8.2.0",
+    "eslint-config-airbnb-base",
     "eslint-plugin-import@^2.25.2",
     "@eslint/eslintrc",
     "@eslint/js",
   ],
+  "installFlags": [
+    "-D",
+  ],
 }

tests/__snapshots__/config@eslint-config-standard

@@ -15,12 +15,15 @@ export default [
 ];",
   "configFilename": "eslint.config.mjs",
   "devDependencies": [
-    "eslint-config-standard",
     "eslint@^8.0.1",
+    "eslint-config-standard",
     "eslint-plugin-import@^2.25.2",
     "eslint-plugin-n@^15.0.0 || ^16.0.0 ",
     "eslint-plugin-promise@^6.0.0",
     "@eslint/eslintrc",
     "@eslint/js",
   ],
+  "installFlags": [
+    "-D",
+  ],
 }

tests/__snapshots__/config@eslint-config-standard-flat

@@ -7,10 +7,13 @@ export default [
 ];",
   "configFilename": "eslint.config.mjs",
   "devDependencies": [
-    "eslint-config-standard",
     "eslint@^8.0.1",
+    "eslint-config-standard",
     "eslint-plugin-import@^2.25.2",
     "eslint-plugin-n@^15.0.0 || ^16.0.0 ",
     "eslint-plugin-promise@^6.0.0",
   ],
+  "installFlags": [
+    "-D",
+  ],
 }

tests/__snapshots__/config@eslint-config-standard-flat2

@@ -7,10 +7,13 @@ export default [
 ];",
   "configFilename": "eslint.config.mjs",
   "devDependencies": [
-    "eslint-config-standard",
     "eslint@^8.0.1",
+    "eslint-config-standard",
     "eslint-plugin-import@^2.25.2",
     "eslint-plugin-n@^15.0.0 || ^16.0.0 ",
     "eslint-plugin-promise@^6.0.0",
   ],
+  "installFlags": [
+    "-D",
+  ],
 }

tests/__snapshots__/config@eslint-config-xo

@@ -15,9 +15,12 @@ export default [
 ];",
   "configFilename": "eslint.config.mjs",
   "devDependencies": [
-    "eslint-config-xo",
     "eslint@>=8.56.0",
+    "eslint-config-xo",
     "@eslint/eslintrc",
     "@eslint/js",
   ],
+  "installFlags": [
+    "-D",
+  ],
 }

tests/__snapshots__/problems-commonjs-none-javascript

@@ -10,8 +10,11 @@ export default [
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@9.x",
     "globals",
     "@eslint/js",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-commonjs-none-typescript

@@ -12,9 +12,12 @@ export default [
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@9.x",
     "globals",
     "@eslint/js",
     "typescript-eslint",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-commonjs-vue-javascript

@@ -12,9 +12,12 @@ export default [
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@9.x",
     "globals",
     "@eslint/js",
     "eslint-plugin-vue",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-commonjs-vue-typescript

@@ -14,10 +14,13 @@ export default [
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@9.x",
     "globals",
     "@eslint/js",
     "typescript-eslint",
     "eslint-plugin-vue",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-esm-none-javascript

@@ -9,8 +9,11 @@ export default [
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@9.x",
     "globals",
     "@eslint/js",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-esm-none-typescript

@@ -11,9 +11,12 @@ export default [
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@9.x",
     "globals",
     "@eslint/js",
     "typescript-eslint",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-esm-react-javascript → tests/__snapshots__/problems-esm-react-eslint8.x-javascript

@@ -5,15 +5,18 @@ import pluginReactConfig from "eslint-plugin-react/configs/recommended.js";
 
 
 export default [
-  {languageOptions: { globals: {...globals.browser, ...globals.node} }},
+  {languageOptions: { globals: globals.browser }},
   pluginJs.configs.recommended,
   pluginReactConfig,
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@8.x",
     "globals",
     "@eslint/js",
     "eslint-plugin-react",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }

tests/__snapshots__/problems-esm-react-typescript → tests/__snapshots__/problems-esm-react-eslint8.x-typescript

@@ -6,17 +6,20 @@ import pluginReactConfig from "eslint-plugin-react/configs/recommended.js";
 
 
 export default [
-  {languageOptions: { globals: {...globals.browser, ...globals.node} }},
+  {languageOptions: { globals: globals.browser }},
   pluginJs.configs.recommended,
   ...tseslint.configs.recommended,
   pluginReactConfig,
 ];",
   "configFilename": "eslint.config.js",
   "devDependencies": [
+    "eslint@8.x",
     "globals",
     "@eslint/js",
     "typescript-eslint",
     "eslint-plugin-react",
-    "eslint",
+  ],
+  "installFlags": [
+    "-D",
   ],
 }