add devel dependency: eslint

eslint.config.mjs

@@ -0,0 +1,22 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+    {
+        files: [
+            'src/**/*.ts',
+        ],
+        rules: {
+            'no-trailing-spaces': 'error',
+        },
+    },
+    {
+        languageOptions: {
+            globals: globals.browser,
+        },
+    },
+    pluginJs.configs.recommended,
+    ...tseslint.configs.recommended,
+];

package.json

@@ -14,7 +14,8 @@
     "pub": "test -f lib/index.js && yarn publish",
     "clean": "rm -r -f lib",
     "format": "yarn prettier --write src",
-    "format:check": "yarn prettier --check src"
+    "format:check": "yarn prettier --check src",
+    "lint": "eslint src && tsc --noEmit"
   },
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
@@ -23,9 +24,13 @@
     "yarn.lock"
   ],
   "devDependencies": {
+    "@eslint/js": "^9.16.0",
+    "eslint": "^9.16.0",
+    "globals": "^15.13.0",
     "prettier": "^3.3.3",
     "ts-loader": "^9.5.1",
     "typescript": "^5.7.2",
+    "typescript-eslint": "^8.17.0",
     "webpack": "^5.97.0",
     "webpack-cli": "^5.1.4"
   },