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/**

* @name Duplicate variable declaration

* @description A variable declaration statement that declares the same variable twice is

* confusing and hard to maintain.

* @kind problem

* @problem.severity recommendation

* @id js/duplicate-variable-declaration

* @tags quality

* maintainability

* readability

* @precision very-high

*/

import javascript

from DeclStmt vds, VariableDeclarator vd1, int i, VariableDeclarator vd2, int j, Variable v

where

vd1 = vds.getDecl(i) and

vd2 = vds.getDecl(j) and

vd1.getBindingPattern().getAVariable() = v and

vd2.getBindingPattern().getAVariable() = v and

i < j

select vd2, "Variable " + v.getName() + " has already $@.", vd1, "been previously declared"