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 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester();
  20
  21 ruleTester.run("no-shadow-restricted-names", rule, {
  22     valid: [
  23         "function foo(bar){ var baz; }",
  24         "!function foo(bar){ var baz; }",
  25         "!function(bar){ var baz; }",
  26         "try {} catch(e) {}",
  27         { code: "export default function() {}", parserOptions: { ecmaVersion: 6, sourceType: "module" } },
  28         {
  29             code: "try {} catch {}",
  30             parserOptions: { ecmaVersion: 2019 }
  31         },
  32         "var undefined;",
  33         "var undefined; doSomething(undefined);",
  34         "var undefined; var undefined;",
  35         {
  36             code: "let undefined",
  37             parserOptions: { ecmaVersion: 2015 }
  38         }
  39     ],
  40     invalid: [
  41         {
  42             code: "function NaN(NaN) { var NaN; !function NaN(NaN) { try {} catch(NaN) {} }; }",
  43             errors: [
  44                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  45                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  46                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  47                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  48                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" },
  49                 { messageId: "shadowingRestrictedName", data: { name: "NaN" }, type: "Identifier" }
  50             ]
  51         },
  52         {
  53             code: "function undefined(undefined) { !function undefined(undefined) { try {} catch(undefined) {} }; }",
  54             errors: [
  55                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  56                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  57                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  58                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
  59                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
  60             ]
  61         },
  62         {
  63             code: "function Infinity(Infinity) { var Infinity; !function Infinity(Infinity) { try {} catch(Infinity) {} }; }",
  64             errors: [
  65                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  66                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  67                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  68                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  69                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" },
  70                 { messageId: "shadowingRestrictedName", data: { name: "Infinity" }, type: "Identifier" }
  71             ]
  72         },
  73         {
  74             code: "function arguments(arguments) { var arguments; !function arguments(arguments) { try {} catch(arguments) {} }; }",
  75             errors: [
  76                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  77                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  78                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  79                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  80                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" },
  81                 { messageId: "shadowingRestrictedName", data: { name: "arguments" }, type: "Identifier" }
  82             ]
  83         },
  84         {
  85             code: "function eval(eval) { var eval; !function eval(eval) { try {} catch(eval) {} }; }",
  86             errors: [
  87                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  88                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  89                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  90                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  91                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
  92                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" }
  93             ]
  94         },
  95         {
  96             code: "var eval = (eval) => { var eval; !function eval(eval) { try {} catch(eval) {} }; }",
  97             parserOptions: { ecmaVersion: 6 },
  98             errors: [
  99                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
 100                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
 101                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
 102                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
 103                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" },
 104                 { messageId: "shadowingRestrictedName", data: { name: "eval" }, type: "Identifier" }
 105             ]
 106         },
 107         {
 108             code: "var [undefined] = [1]",
 109             parserOptions: { ecmaVersion: 6 },
 110             errors: [
 111                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
 112             ]
 113         },
 114         {
 115             code: "var {undefined} = obj; var {a: undefined} = obj; var {a: {b: {undefined}}} = obj; var {a, ...undefined} = obj;",
 116             parserOptions: { ecmaVersion: 9 },
 117             errors: [
 118                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
 119                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
 120                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" },
 121                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
 122             ]
 123         },
 124         {
 125             code: "var undefined; undefined = 5;",
 126             errors: [
 127                 { messageId: "shadowingRestrictedName", data: { name: "undefined" }, type: "Identifier" }
 128             ]
 129         }
 130     ]
 131 });