Fix silent fail if @babel/plugin-proposal-decorators is in user's Babel configuration (#237)

Co-authored-by: Masafumi Koba <473530+ybiquitous@users.noreply.github.com>

Author: puku0x

extract.js

@@ -159,6 +159,17 @@ function loadBabelOpts(opts) {
 		}
 	}
 
+	// avoid conflicting with the legacy decorators plugin
+	if (opts.plugins && opts.plugins.some((p) => p.key === 'proposal-decorators')) {
+		const index = opts.parserOpts.plugins.findIndex(
+			(p) => Array.isArray(p) && p[0] === 'decorators',
+		);
+
+		if (index > -1) {
+			opts.parserOpts.plugins.splice(index, 1);
+		}
+	}
+
 	return opts;
 }
 

package-lock.json

@@ -75,6 +75,7 @@
     "@babel/core": "^7.17.9"
   },
   "devDependencies": {
+    "@babel/plugin-proposal-decorators": "^7.17.9",
     "@stylelint/prettier-config": "^2.0.0",
     "@stylelint/remark-preset": "^2.0.0",
     "autoprefixer": "^9.8.6",