no-delete-var.js
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/**
* @fileoverview Rule to flag when deleting variables
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "disallow deleting variables",
category: "Variables",
recommended: true,
url: "https://eslint.org/docs/rules/no-delete-var"
},
schema: [],
messages: {
unexpected: "Variables should not be deleted."
}
},
create(context) {
return {
UnaryExpression(node) {
if (node.operator === "delete" && node.argument.type === "Identifier") {
context.report({ node, messageId: "unexpected" });
}
}
};
}
};