eslint/docs/rules/no-delete-var.md

   1 # disallow deleting variables (no-delete-var)
   2
   3 The purpose of the `delete` operator is to remove a property from an object. Using the `delete` operator on a variable might lead to unexpected behavior.
   4
   5 ## Rule Details
   6
   7 This rule disallows the use of the `delete` operator on variables.
   8
   9 If ESLint parses code in strict mode, the parser (instead of this rule) reports the error.
  10
  11 Examples of **incorrect** code for this rule:
  12
  13 ```js
  14 /*eslint no-delete-var: "error"*/
  15
  16 var x;
  17 delete x;
  18 ```