Upgrade to eslint@9

Author: zerodevx

.eslintignore

@@ -1,4 +1,5 @@
 #!/usr/bin/env zx
+/* global $, fs, argv, echo, chalk */
 
 await $`npm run lint && npx svelte-package`
 const packed = await $`npx vite build -c vite.dist.config.js`

.eslintrc.cjs

@@ -0,0 +1,28 @@
+import js from '@eslint/js'
+import svelte from 'eslint-plugin-svelte'
+import prettier from 'eslint-config-prettier'
+import globals from 'globals'
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  js.configs.recommended,
+  ...svelte.configs['flat/recommended'],
+  prettier,
+  ...svelte.configs['flat/prettier'],
+  {
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      }
+    },
+    rules: {
+      'no-tabs': 'error',
+      'no-unexpected-multiline': 'error',
+      'svelte/no-at-html-tags': 'off'
+    }
+  },
+  {
+    ignores: ['build/', '.svelte-kit/', 'dist/', 'temp/']
+  }
+]

build.mjs

@@ -9,7 +9,7 @@
     "check": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json",
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./jsconfig.json --watch",
     "format": "prettier --plugin-search-dir . --write .",
-    "lint": "prettier --plugin-search-dir . --check . && eslint . && npm run check",
+    "lint": "prettier --plugin-search-dir . --check . && eslint && npm run check",
     "test": "playwright test",
     "prepublishOnly": "echo 'Did you mean to publish `./package/`, instead of `./`?' && exit 1",
     "build": "zx build.mjs",
@@ -25,12 +25,14 @@
     "@sveltejs/kit": "^2.5.27",
     "@sveltejs/package": "^2.3.5",
     "@sveltejs/vite-plugin-svelte": "^3.1.2",
+    "@types/eslint": "^9.6.1",
     "autoprefixer": "^10.4.20",
     "camelcase": "^7.0.1",
     "daisyui": "^3.9.4",
-    "eslint": "^8.57.0",
-    "eslint-config-prettier": "^8.10.0",
+    "eslint": "^9.10.0",
+    "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-svelte": "^2.44.0",
+    "globals": "^15.9.0",
     "is-port-reachable": "^4.0.0",
     "postcss": "^8.4.47",
     "postcss-load-config": "^4.0.2",