Disallow Variables Deletion (no-delete-var)

This rule prevents the use of delete operator on variables:

/*eslint no-delete-var: 2*/

var x;
delete x;  /*error Variables should not be deleted.*/

The delete operator will only delete the properties of objects. It cannot “delete” variables or anything else. Using them on variables might lead to unexpected behavior.

Further Reading

• Only properties should be deleted

Version

This rule was introduced in ESLint 0.0.9.

Resources

• Rule source
• Documentation source