fix: remove duplicates from arrow function params (#213)

Author: dstallenberg

libraries/analysis-javascript/lib/RootContext.ts

@@ -66,19 +66,9 @@ export class RootContext extends FrameworkRootContext<t.Node> {
   protected _targetFiles: Set<string>;
   protected _analysisFiles: Set<string>;
 
-  // filePath -> id -> element
-  protected _elementMap: Map<string, Map<string, Element>>;
-  // filePath -> id -> relation
-  protected _relationMap: Map<string, Map<string, Relation>>;
-  // filePath -> id -> object
-  protected _objectMap: Map<string, Map<string, DiscoveredObjectType>>;
-
   protected _typeModel: TypeModel;
   protected _typePool: TypePool;
 
-  // Mapping: filePath -> target name -> Exports
-  protected _exportMap: Map<string, Export[]>;
-
   get targetFiles() {
     return this._targetFiles;
   }

libraries/search-javascript/lib/testcase/sampling/JavaScriptRandomSampler.ts

@@ -750,7 +750,7 @@ export class JavaScriptRandomSampler extends JavaScriptTestCaseSampler {
       .getTypeModel()
       .getObjectDescription(typeId);
 
-    const parameters: string[] = [];
+    let parameters: string[] = [];
 
     for (const [index, name] of typeObject.parameterNames.entries()) {
       parameters[index] = name;
@@ -763,6 +763,11 @@ export class JavaScriptRandomSampler extends JavaScriptTestCaseSampler {
       }
     }
 
+    // filter duplicates
+    parameters = parameters.filter(
+      (item, index) => parameters.indexOf(item) === index
+    );
+
     if (typeObject.return.size === 0) {
       return new ArrowFunctionStatement(
         id,