Rule: Avoid redeclaration of variables

Ref: JSC_REDECLARED_VARIABLE at https://developers.google.com/closure/compiler/docs/error-ref

Title

Avoid redeclaration of variables

Severity

Major

Description

This rule checks that the var keyword is not used to declare a variable with a name that is already in use. It applies to already defined variables as well as to function parameters.

This use of duplicate name is often unwanted and can lead to bugs and more generally to confusing code.

var a = 'foo';
var a = 'bar'; // Non-Compliant

function f(e) { 
  var e = "event"; // Non-Compliant
}

Message

Rename variable '

' as this name is already used.

Activated?

Yes

Cardinality

Single