eslint/lib/rules/no-nested-ternary.js

   1 /**
   2  * @fileoverview Rule to flag nested ternary expressions
   3  * @author Ian Christian Myers
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Rule Definition
  10 //------------------------------------------------------------------------------
  11
  12 /** @type {import('../shared/types').Rule} */
  13 module.exports = {
  14     meta: {
  15         type: "suggestion",
  16
  17         docs: {
  18             description: "disallow nested ternary expressions",
  19             recommended: false,
  20             url: "https://eslint.org/docs/rules/no-nested-ternary"
  21         },
  22
  23         schema: [],
  24
  25         messages: {
  26             noNestedTernary: "Do not nest ternary expressions."
  27         }
  28     },
  29
  30     create(context) {
  31
  32         return {
  33             ConditionalExpression(node) {
  34                 if (node.alternate.type === "ConditionalExpression" ||
  35                         node.consequent.type === "ConditionalExpression") {
  36                     context.report({
  37                         node,
  38                         messageId: "noNestedTernary"
  39                     });
  40                 }
  41             }
  42         };
  43     }
  44 };