disallowMultipleVarDecl

Disallows multiple var declaration (except for-loop).

Types: Boolean or Object

Values:

• true disallows multiple variable declarations except within a for loop
• Object:
  • 'strict' disallows all multiple variable declarations
  • 'allExcept' array of exceptions:
    • 'undefined' allows declarations where all variables are not defined
    • 'require' allows declarations where all variables are importing external modules with require

Example

"disallowMultipleVarDecl": true

Valid for true

var x = 1;
var y = 2;

for (var i = 0, j = arr.length; i < j; i++) {}

Valid for { strict: true }

var x = 1;
var y = 2;

Valid for { allExcept: ['undefined'] }

var a, b;
var x = 1;
var y = 2;

for (var i = 0, j = arr.length; i < j; i++) {}

Valid for { allExcept: ['require'] }

var a = require('a'),
    b = require('b');

var x = 1;
var y = 2;

for (var i = 0, j = arr.length; i < j; i++) {}

Invalid

var x = 1,
    y = 2;

var x, y = 2, z;