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 module.exports = {
  13     meta: {
  14         type: "suggestion",
  15
  16         docs: {
  17             description: "disallow nested ternary expressions",
  18             category: "Stylistic Issues",
  19             recommended: false,
  20             url: "https://eslint.org/docs/rules/no-nested-ternary"
  21         },
  22
  23         schema: []
  24     },
  25
  26     create(context) {
  27
  28         return {
  29             ConditionalExpression(node) {
  30                 if (node.alternate.type === "ConditionalExpression" ||
  31                         node.consequent.type === "ConditionalExpression") {
  32                     context.report({ node, message: "Do not nest ternary expressions." });
  33                 }
  34             }
  35         };
  36     }
  37 };