chore: improve performance of check

Author: philippfromme

lib/base/VariableResolver.js

@@ -274,15 +274,23 @@ export class BaseVariableResolver {
 
     const reversedVariables = [ ...scopeVariables, ...parentsScopeVariables ].reverse();
 
+    const seenNames = new Set();
+
     return reversedVariables.filter(variable => {
 
       // if external variable, keep
       if (variable.provider.find(extractor => extractor !== this._baseExtractor)) {
         return true;
       }
 
-      // if not external, keep only if first of its name
-      return reversedVariables.find(v => v.name === variable.name) === variable;
+      // if not external, keep only the first occurrence of each name
+      if (!seenNames.has(variable.name)) {
+        seenNames.add(variable.name);
+
+        return true;
+      }
+
+      return false;
     });
   }
 }