Rule: Either camelCase or UPPER_CASE styles must be used for all variable names

• Title
  Either camelCase or UPPER_CASE styles must be used for all variable names

• Description
  This rule allows you to force all variable names to use either camelCase style or UPPER_CASE style with underscores.

example :

var myName = "Joe Doe"; //Compliant
var MY_NAME = "Joe Doe"; //Compliant
var MYName = "Joe Doe"; //Non-Compliant
var my_name = "Joe Doe"; //Non-Compliant
var MyName = "Joe Doe"; //Non-Compliant

• Violation message
  Update this variable name to comply either with the camelCase or UPPER_CASE styles

• Default severity
  Minor

Origin: JSHint