eslint/tests/lib/rules/no-shadow-restricted-names.js

   1 /**
   2  * @fileoverview Disallow shadowing of NaN, undefined, and Infinity (ES5 section 15.1.1)
   3  * @author Michael Ficarra
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/no-shadow-restricted-names"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 const ruleTester = new RuleTester();
  16
  17 ruleTester.run("no-shadow-restricted-names", rule, {
  18     valid: [
  19         "function foo(bar){ var baz; }",
  20         "!function foo(bar){ var baz; }",
  21         "!function(bar){ var baz; }",
  22         "try {} catch(e) {}",
  23         { code: "export default function() {}", parserOptions: { ecmaVersion: 6, sourceType: "module" } },
  24         {
  25             code: "try {} catch {}",
  26             parserOptions: { ecmaVersion: 2019 }
  27         },
  28         "var undefined;",
  29         "var undefined; doSomething(undefined);",
  30         "var undefined; var undefined;",
  31         {
  32             code: "let undefined",
  33             parserOptions: { ecmaVersion: 2015 }
  34         }
  35     ],
  36     invalid: [
  37         {
  38             code: "function NaN(NaN) { var NaN; !function NaN(NaN) { try {} catch(NaN) {} }; }",
  39             errors: [
  40                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  41                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  42                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  43                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  44                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  45                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" }
  46             ]
  47         },
  48         {
  49             code: "function undefined(undefined) { !function undefined(undefined) { try {} catch(undefined) {} }; }",
  50             errors: [
  51                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  52                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  53                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  54                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  55                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
  56             ]
  57         },
  58         {
  59             code: "function Infinity(Infinity) { var Infinity; !function Infinity(Infinity) { try {} catch(Infinity) {} }; }",
  60             errors: [
  61                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  62                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  63                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  64                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  65                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  66                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" }
  67             ]
  68         },
  69         {
  70             code: "function arguments(arguments) { var arguments; !function arguments(arguments) { try {} catch(arguments) {} }; }",
  71             errors: [
  72                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  73                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  74                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  75                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  76                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  77                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" }
  78             ]
  79         },
  80         {
  81             code: "function eval(eval) { var eval; !function eval(eval) { try {} catch(eval) {} }; }",
  82             errors: [
  83                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  84                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  85                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  86                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  87                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  88                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" }
  89             ]
  90         },
  91         {
  92             code: "var eval = (eval) => { var eval; !function eval(eval) { try {} catch(eval) {} }; }",
  93             parserOptions: { ecmaVersion: 6 },
  94             errors: [
  95                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  96                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  97                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  98                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  99                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
 100                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" }
 101             ]
 102         },
 103         {
 104             code: "var [undefined] = [1]",
 105             parserOptions: { ecmaVersion: 6 },
 106             errors: [
 107                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
 108             ]
 109         },
 110         {
 111             code: "var {undefined} = obj; var {a: undefined} = obj; var {a: {b: {undefined}}} = obj; var {a, ...undefined} = obj;",
 112             parserOptions: { ecmaVersion: 9 },
 113             errors: [
 114                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
 115                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
 116                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
 117                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
 118             ]
 119         },
 120         {
 121             code: "var undefined; undefined = 5;",
 122             errors: [
 123                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
 124             ]
 125         }
 126     ]
 127 });