fix: merging issue with global local prop

Author: konnng-dev

lib/index.js

@@ -34,7 +34,7 @@ module.exports = (options = {}) => {
           const localsJson = JSON.parse(localsRaw);
           posthtmlExpressionsOptions = {
             ...posthtmlExpressionsOptions,
-            locals: posthtmlExpressionsOptions.locals ? Object.assign(posthtmlExpressionsOptions.locals, localsJson) : localsJson
+            locals: posthtmlExpressionsOptions.locals ? {...posthtmlExpressionsOptions.locals, ...localsJson} : localsJson
           };
         } catch {}