eslint/tests/lib/rules/prefer-regex-literals.js

   1 /**
   2  * @fileoverview Tests for the prefer-regex-literals rule
   3  * @author Milos Djermanovic
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/prefer-regex-literals");
  13 const { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 2015 } });
  20
  21 ruleTester.run("prefer-regex-literals", rule, {
  22     valid: [
  23         "/abc/",
  24         "/abc/g",
  25
  26         // considered as dynamic
  27         "new RegExp(pattern)",
  28         "RegExp(pattern, 'g')",
  29         "new RegExp(f('a'))",
  30         "RegExp(prefix + 'a')",
  31         "new RegExp('a' + suffix)",
  32         "RegExp(`a` + suffix);",
  33         "new RegExp(String.raw`a` + suffix);",
  34         "RegExp('a', flags)",
  35         "RegExp('a', 'g' + flags)",
  36         "new RegExp(String.raw`a`, flags);",
  37         "RegExp(`${prefix}abc`)",
  38         "new RegExp(`a${b}c`);",
  39         "new RegExp(`a${''}c`);",
  40         "new RegExp(String.raw`a${b}c`);",
  41         "new RegExp(String.raw`a${''}c`);",
  42         "new RegExp('a' + 'b')",
  43         "RegExp(1)",
  44
  45         // invalid number of arguments
  46         "new RegExp;",
  47         "new RegExp();",
  48         "RegExp();",
  49         "new RegExp('a', 'g', 'b');",
  50         "RegExp('a', 'g', 'b');",
  51         "new RegExp(`a`, `g`, `b`);",
  52         "RegExp(`a`, `g`, `b`);",
  53         "new RegExp(String.raw`a`, String.raw`g`, String.raw`b`);",
  54         "RegExp(String.raw`a`, String.raw`g`, String.raw`b`);",
  55
  56         // not String.raw``
  57         "new RegExp(String`a`);",
  58         "RegExp(raw`a`);",
  59         "new RegExp(f(String.raw)`a`);",
  60         "RegExp(string.raw`a`);",
  61         "new RegExp(String.Raw`a`);",
  62         "new RegExp(String[raw]`a`);",
  63         "RegExp(String.raw.foo`a`);",
  64         "new RegExp(String.foo.raw`a`);",
  65         "RegExp(foo.String.raw`a`);",
  66         "new RegExp(String.raw);",
  67
  68         // not the global String in String.raw``
  69         "let String; new RegExp(String.raw`a`);",
  70         "function foo() { var String; new RegExp(String.raw`a`); }",
  71         "function foo(String) { RegExp(String.raw`a`); }",
  72         "if (foo) { const String = bar; RegExp(String.raw`a`); }",
  73         "/* globals String:off */ new RegExp(String.raw`a`);",
  74         {
  75             code: "RegExp('a', String.raw`g`);",
  76             globals: { String: "off" }
  77         },
  78
  79         // not RegExp
  80         "new Regexp('abc');",
  81         "Regexp(`a`);",
  82         "new Regexp(String.raw`a`);",
  83
  84         // not the global RegExp
  85         "let RegExp; new RegExp('a');",
  86         "function foo() { var RegExp; RegExp('a', 'g'); }",
  87         "function foo(RegExp) { new RegExp(String.raw`a`); }",
  88         "if (foo) { const RegExp = bar; RegExp('a'); }",
  89         "/* globals RegExp:off */ new RegExp('a');",
  90         {
  91             code: "RegExp('a');",
  92             globals: { RegExp: "off" }
  93         },
  94         "new globalThis.RegExp('a');",
  95         {
  96             code: "new globalThis.RegExp('a');",
  97             env: { es6: true }
  98         },
  99         {
 100             code: "new globalThis.RegExp('a');",
 101             env: { es2017: true }
 102         }
 103     ],
 104
 105     invalid: [
 106         {
 107             code: "new RegExp('abc');",
 108             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 109         },
 110         {
 111             code: "RegExp('abc');",
 112             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 113         },
 114         {
 115             code: "new RegExp('abc', 'g');",
 116             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 117         },
 118         {
 119             code: "RegExp('abc', 'g');",
 120             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 121         },
 122         {
 123             code: "new RegExp(`abc`);",
 124             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 125         },
 126         {
 127             code: "RegExp(`abc`);",
 128             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 129         },
 130         {
 131             code: "new RegExp(`abc`, `g`);",
 132             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 133         },
 134         {
 135             code: "RegExp(`abc`, `g`);",
 136             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 137         },
 138         {
 139             code: "new RegExp(String.raw`abc`);",
 140             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 141         },
 142         {
 143             code: "RegExp(String.raw`abc`);",
 144             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 145         },
 146         {
 147             code: "new RegExp(String.raw`abc`, String.raw`g`);",
 148             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 149         },
 150         {
 151             code: "RegExp(String.raw`abc`, String.raw`g`);",
 152             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 153         },
 154         {
 155             code: "new RegExp(String['raw']`a`);",
 156             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 157         },
 158         {
 159             code: "new RegExp('');",
 160             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 161         },
 162         {
 163             code: "RegExp('', '');",
 164             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 165         },
 166         {
 167             code: "new RegExp(String.raw``);",
 168             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 169         },
 170         {
 171             code: "new RegExp('a', `g`);",
 172             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 173         },
 174         {
 175             code: "RegExp(`a`, 'g');",
 176             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 177         },
 178         {
 179             code: "RegExp(String.raw`a`, 'g');",
 180             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 181         },
 182         {
 183             code: "new RegExp(String.raw`\\d`, `g`);",
 184             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 185         },
 186         {
 187             code: "RegExp('a', String.raw`g`);",
 188             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 189         },
 190         {
 191             code: "new globalThis.RegExp('a');",
 192             env: { es2020: true },
 193             errors: [{ messageId: "unexpectedRegExp", type: "NewExpression" }]
 194         },
 195         {
 196             code: "globalThis.RegExp('a');",
 197             env: { es2020: true },
 198             errors: [{ messageId: "unexpectedRegExp", type: "CallExpression" }]
 199         }
 200     ]
 201 });