chore: add linting on CI

.github/workflows/lint.yml

@@ -0,0 +1,19 @@
+on: push
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Use Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: "18.x"
+
+    - name: Install dependencies
+      run: npm install
+
+    - name: Lint plugin
+      run: npm run lint

eslint.config.mjs

@@ -0,0 +1,43 @@
+import globals from "globals";
+import js from "@eslint/js";
+import tseslint from "typescript-eslint";
+import svelte from "eslint-plugin-svelte";
+import tsPlugin from "@typescript-eslint/eslint-plugin";
+import svelteParser from "svelte-eslint-parser";
+import tsParser from "@typescript-eslint/parser";
+
+export default [
+  js.configs.recommended,
+  tseslint.configs.eslintRecommended,
+  ...tseslint.configs.recommended,
+  ...svelte.configs["flat/prettier"],
+  {
+    files: ["**/*.ts", "**/*.svelte", "**/*.mjs", "**/*.js"],
+    languageOptions: {
+      parser: tsParser,
+      globals: { ...globals.node },
+      sourceType: "module",
+    },
+    plugins: { "@typescript-eslint": tsPlugin },
+    rules: {
+      "no-undef": "off",
+      "no-unused-vars": "off",
+      "@typescript-eslint/no-unused-vars": ["error", { args: "none" }],
+      "@typescript-eslint/ban-ts-comment": "off",
+      "no-prototype-builtins": "off",
+      "@typescript-eslint/no-empty-function": "off",
+    },
+  },
+  {
+    files: ["**/*.svelte"],
+    languageOptions: {
+      parser: svelteParser,
+      parserOptions: {
+        parser: "@typescript-eslint/parser",
+      },
+    },
+  },
+  {
+    ignores: ["node_modules", "main.js"],
+  },
+];