Update to eslint9 with xo config

Author: schorfES

.eslintignore

@@ -0,0 +1,19 @@
+import {defineConfig, globalIgnores} from 'eslint/config';
+import globals from 'globals';
+import ConfigXo from 'eslint-config-xo';
+import ConfigJest from 'eslint-plugin-jest';
+
+export default defineConfig([
+	{languageOptions: {globals: {...globals.node}}},
+	...ConfigXo,
+	{
+		files: ['**/*.test.*'],
+		languageOptions: {globals: {...globals.jest}},
+		...ConfigJest.configs['flat/all'],
+	},
+	globalIgnores([
+		'coverage/',
+		'example/',
+		'tests/',
+	]),
+]);