chore: migrate to eslint 9 (#241)

Author: benmccann

eslint.config.mjs

@@ -0,0 +1,38 @@
+import { defineConfig } from 'eslint/config';
+import globals from 'globals';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+export default defineConfig([{
+    extends: compat.extends('eslint:recommended', 'prettier'),
+
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            ...globals.mocha,
+            ...globals.node,
+        },
+
+        ecmaVersion: 10,
+        sourceType: 'module',
+    },
+
+    rules: {
+        'keyword-spacing': [2, {
+            before: true,
+            after: true,
+        }],
+
+        'no-cond-assign': [0],
+    },
+}]);

index.js

@@ -114,7 +114,7 @@ module.exports = function (options = {}) {
 						);
 						warned = true;
 					}
-				} catch (e) {
+				} catch {
 					// do nothing, this isn't a Svelte library
 				}
 			}