eslint/lib/rules/no-delete-var.js

   1 /**
   2  * @fileoverview Rule to flag when deleting variables
   3  * @author Ilya Volodin
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Rule Definition
  10 //------------------------------------------------------------------------------
  11
  12 module.exports = {
  13     meta: {
  14         type: "suggestion",
  15
  16         docs: {
  17             description: "disallow deleting variables",
  18             category: "Variables",
  19             recommended: true,
  20             url: "https://eslint.org/docs/rules/no-delete-var"
  21         },
  22
  23         schema: [],
  24
  25         messages: {
  26             unexpected: "Variables should not be deleted."
  27         }
  28     },
  29
  30     create(context) {
  31
  32         return {
  33
  34             UnaryExpression(node) {
  35                 if (node.operator === "delete" && node.argument.type === "Identifier") {
  36                     context.report({ node, messageId: "unexpected" });
  37                 }
  38             }
  39         };
  40
  41     }
  42 };