migrate to flat config, bump minimum nodejs version

.github/workflows/nodejs.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [14, 16, 18]
+        node-version: [16, 18, 20, 22]
 
     steps:
     - uses: actions/checkout@v1

eslint.config.js

@@ -0,0 +1,33 @@
+import js from "@eslint/js";
+import globals from "globals";
+import eslintPluginPrettierRecommended from "eslint-plugin-prettier/recommended";
+import importPlugin from 'eslint-plugin-import';
+
+export default [
+  js.configs.recommended,
+  eslintPluginPrettierRecommended,
+  importPlugin.flatConfigs.recommended,
+  {
+    languageOptions: {
+      ecmaVersion: "latest",
+      sourceType: "module",
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        ...globals.mocha,
+      }
+    },
+    rules: {
+      "eol-last": "error",
+      "import/extensions": ["error", "always"],
+      'import/no-unresolved': 0, // https://github.com/import-js/eslint-plugin-import/issues/3082
+      "no-console": "error",
+      "no-constant-condition": ["error", { "checkLoops": false }],
+      "no-eval": "error",
+      "no-implied-eval": "error",
+      "no-trailing-spaces": "error",
+      "prefer-const": "error",
+      "semi": "error"
+    },
+  },
+];

package.json

@@ -9,7 +9,7 @@
     "Timothy Gu <[email protected]>"
   ],
   "engines": {
-    "node": ">= 14"
+    "node": ">= 16"
   },
   "license": "W3C",
   "devDependencies": {