disallow deleting variables (no-delete-var)

The "extends": "eslint:recommended" property in a configuration file enables this rule.

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.

Rule Details

This rule disallows the use of the delete operator on variables.

If ESLint parses code in strict mode, the parser (instead of this rule) reports the error.

Examples of incorrect code for this rule:

/*eslint no-delete-var: "error"*/

var x;
delete x;

Version

This rule was introduced in ESLint 0.0.9.

Resources

• Rule source
• Documentation source