feat(eslint): use correct sourceType for scripts and modules

.eslintrc.js

@@ -18,10 +18,17 @@ module.exports = {
         'no-console': 'off',
       },
     },
+    {
+      files: ['*.mjs'],
+      parserOptions: {
+        sourceType: 'module',
+      },
+    },
   ],
 
   parserOptions: {
     ecmaVersion: 13,
+    sourceType: 'script',
   },
 
   rules: {

scripts/babel-eslintrc.js

@@ -1,8 +1,18 @@
+'use strict'
+
 module.exports = {
+  overrides: [
+    {
+      files: ['src/**/*'],
+
       parser: '@babel/eslint-parser',
+
       parserOptions: {
         ecmaFeatures: {
           legacyDecorators: true,
         },
+        sourceType: 'module',
       },
+    },
+  ],
 }