Switch back to using .mjs extension otherwise webpack doesn't compile well with type:module specified in package.json file

eslint.config.mjs

@@ -0,0 +1,30 @@
+import eslintPluginVue from 'eslint-plugin-vue'
+import ts from 'typescript-eslint'
+
+export default ts.config(
+  ...ts.configs.recommended,
+  ...ts.configs.stylistic,
+  ...eslintPluginVue.configs['flat/essential'],
+  {
+    files: ['**/*.vue'],
+    languageOptions: {
+      parserOptions: {
+        parser: '@typescript-eslint/parser'
+      }
+    }
+  },
+  {
+    ignores: [
+      '**/vendor/*',
+      '**/import-png.d.ts',
+      '**/chill.webpack.config.js'
+    ]
+  },
+  {
+    rules: {
+      // override/add rules settings here, such as:
+      'vue/multi-word-component-names': 'off',
+      '@typescript-eslint/no-require-imports': 'off'
+    }
+  }
+)