Update ESLint to v10

eslint.config.mjs

@@ -0,0 +1,69 @@
+import eslintPluginJs from "@eslint/js";
+import eslintPluginPrettierRecommended from "eslint-plugin-prettier/recommended";
+import eslintPluginPrettierDoc from "eslint-plugin-prettier-doc";
+import eslintPluginImport from "eslint-plugin-import";
+import globals from "globals";
+
+export default [
+  eslintPluginJs.configs.recommended,
+  eslintPluginPrettierDoc.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.builtin,
+        ...globals.node,
+        ...globals.jest,
+      },
+    },
+    plugins: {
+      import: eslintPluginImport,
+    },
+    rules: {
+      eqeqeq: "error",
+      curly: "error",
+      "no-else-return": "error",
+      "no-inner-declarations": "error",
+      "no-useless-return": "error",
+      "no-var": "error",
+      "one-var": ["error", "never"],
+      "object-shorthand": "error",
+      "prefer-arrow-callback": "error",
+      "prefer-const": "error",
+      "prefer-destructuring": "error",
+      "prefer-template": "error",
+      strict: "error",
+      "symbol-description": "error",
+      yoda: [
+        "error",
+        "never",
+        {
+          exceptRange: true,
+        },
+      ],
+      "import/extensions": ["error", "ignorePackages"],
+      "import/no-extraneous-dependencies": [
+        "error",
+        {
+          devDependencies: [
+            "tests*/**",
+            "scripts/**",
+            "build/**",
+            "eslint.config.mjs",
+          ],
+        },
+      ],
+    },
+  },
+  eslintPluginPrettierRecommended,
+  {
+    files: ["tests/**/*.mjs"],
+    languageOptions: {
+      globals: {
+        run_spec: "readonly",
+      },
+    },
+  },
+  {
+    ignores: ["standalone.js"],
+  },
+];

package.json

@@ -31,6 +31,7 @@
   },
   "devDependencies": {
     "@babel/preset-env": "^7.29.7",
+    "@eslint/js": "^10.0.1",
     "@rollup/plugin-alias": "^6.0.0",
     "@rollup/plugin-babel": "^7.1.0",
     "@rollup/plugin-commonjs": "^29.0.3",
@@ -41,12 +42,12 @@
     "@rollup/plugin-terser": "^1.0.0",
     "c8": "^12.0.0",
     "cross-env": "^10.1.0",
-    "eslint": "8.57.1",
+    "eslint": "10.13.0",
     "eslint-config-prettier": "10.1.8",
     "eslint-plugin-import": "2.32.0",
-    "eslint-plugin-jest": "29.17.0",
     "eslint-plugin-prettier": "5.5.7",
-    "eslint-plugin-prettier-doc": "^1.1.0",
+    "eslint-plugin-prettier-doc": "2.0.0",
+    "globals": "^17.13.0",
     "jest": "30.5.2",
     "jest-environment-jsdom": "30.5.2",
     "jest-light-runner": "0.8.2",

src/options.mjs

@@ -61,10 +61,10 @@ function getComposerPhpVersion() {
 
         if (versionMatch) {
           return parseFloat(`${versionMatch[1]}.${versionMatch[2]}`);
-        } else {
-          getComposerError = `Could not decode PHP version (${composerJson.require.php}})`;
-          return null;
         }
+
+        getComposerError = `Could not decode PHP version (${composerJson.require.php}})`;
+        return null;
       }
     } catch (e) {
       getComposerError = `Error reading composer.json: ${e.message}`;

tests/syntax-error/jsfmt.spec.mjs

@@ -22,7 +22,6 @@ test("Syntax errors have the expected structure", async () => {
       codeFrame: stripAnsi(err.codeFrame),
     });
 
-    // eslint-disable-next-line jest/no-conditional-expect
     expect(errObject).toMatchSnapshot();
   }
 });

tests_config/run_spec.mjs

@@ -73,7 +73,6 @@ global.run_spec = (importMeta, parsers, options) => {
       visualizedOutput = visualizeEndOfLine(output);
     });
 
-    // eslint-disable-next-line jest/valid-title
     test(basename, async () => {
       expect(visualizedOutput).toEqual(
         visualizeEndOfLine(consistentEndOfLine(output))