1/** 2 * @fileoverview Rule to disallow use of the new operator with the `Symbol` object 3 * @author Alberto Rodríguez 4 */ 5 6"use strict"; 7 8//------------------------------------------------------------------------------ 9// Rule Definition 10//------------------------------------------------------------------------------ 11 12module.exports = { 13 meta: { 14 type: "problem", 15 16 docs: { 17 description: "disallow `new` operators with the `Symbol` object", 18 category: "ECMAScript 6", 19 recommended: true, 20 url: "https://eslint.org/docs/rules/no-new-symbol" 21 }, 22 23 schema: [], 24 25 messages: { 26 noNewSymbol: "`Symbol` cannot be called as a constructor." 27 } 28 }, 29 30 create(context) { 31 32 return { 33 "Program:exit"() { 34 const globalScope = context.getScope(); 35 const variable = globalScope.set.get("Symbol"); 36 37 if (variable && variable.defs.length === 0) { 38 variable.references.forEach(ref => { 39 const node = ref.identifier; 40 const parent = node.parent; 41 42 if (parent && parent.type === "NewExpression" && parent.callee === node) { 43 context.report({ 44 node, 45 messageId: "noNewSymbol" 46 }); 47 } 48 }); 49 } 50 } 51 }; 52 53 } 54}; 55