eslint/tests/lib/rules/no-extra-bind.js

   1 /**
   2  * @fileoverview Tests for no-extra-bind rule
   3  * @author Bence Dányi <bence@danyi.me>
   4  */
   5 "use strict";
   6
   7 //------------------------------------------------------------------------------
   8 // Requirements
   9 //------------------------------------------------------------------------------
  10
  11 const rule = require("../../../lib/rules/no-extra-bind"),
  12     { RuleTester } = require("../../../lib/rule-tester");
  13
  14 //------------------------------------------------------------------------------
  15 // Tests
  16 //------------------------------------------------------------------------------
  17
  18 const ruleTester = new RuleTester();
  19 const errors = [{ messageId: "unexpected", type: "CallExpression" }];
  20
  21 ruleTester.run("no-extra-bind", rule, {
  22     valid: [
  23         "var a = function(b) { return b }.bind(c, d)",
  24         { code: "var a = function(b) { return b }.bind(...c)", parserOptions: { ecmaVersion: 6 } },
  25         "var a = function() { this.b }()",
  26         "var a = function() { this.b }.foo()",
  27         "var a = f.bind(a)",
  28         "var a = function() { return this.b }.bind(c)",
  29         { code: "var a = (() => { return b }).bind(c, d)", parserOptions: { ecmaVersion: 6 } },
  30         "(function() { (function() { this.b }.bind(this)) }.bind(c))",
  31         "var a = function() { return 1; }[bind](b)",
  32         { code: "var a = function() { return 1; }[`bi${n}d`](b)", parserOptions: { ecmaVersion: 6 } },
  33         { code: "var a = function() { return () => this; }.bind(b)", parserOptions: { ecmaVersion: 6 } }
  34     ],
  35     invalid: [
  36         {
  37             code: "var a = function() { return 1; }.bind(b)",
  38             output: "var a = function() { return 1; }",
  39             errors: [{
  40                 messageId: "unexpected",
  41                 type: "CallExpression",
  42                 line: 1,
  43                 column: 34,
  44                 endLine: 1,
  45                 endColumn: 38
  46             }]
  47         },
  48         {
  49             code: "var a = function() { return 1; }['bind'](b)",
  50             output: "var a = function() { return 1; }",
  51             errors: [{
  52                 messageId: "unexpected",
  53                 type: "CallExpression",
  54                 line: 1,
  55                 column: 34,
  56                 endLine: 1,
  57                 endColumn: 40
  58             }]
  59         },
  60         {
  61             code: "var a = function() { return 1; }[`bind`](b)",
  62             output: "var a = function() { return 1; }",
  63             parserOptions: { ecmaVersion: 6 },
  64             errors: [{
  65                 messageId: "unexpected",
  66                 type: "CallExpression",
  67                 line: 1,
  68                 column: 34,
  69                 endLine: 1,
  70                 endColumn: 40
  71             }]
  72         },
  73         {
  74             code: "var a = (() => { return 1; }).bind(b)",
  75             output: "var a = (() => { return 1; })",
  76             parserOptions: { ecmaVersion: 6 },
  77             errors
  78         },
  79         {
  80             code: "var a = (() => { return this; }).bind(b)",
  81             output: "var a = (() => { return this; })",
  82             parserOptions: { ecmaVersion: 6 },
  83             errors
  84         },
  85         {
  86             code: "var a = function() { (function(){ this.c }) }.bind(b)",
  87             output: "var a = function() { (function(){ this.c }) }",
  88             errors
  89         },
  90         {
  91             code: "var a = function() { function c(){ this.d } }.bind(b)",
  92             output: "var a = function() { function c(){ this.d } }",
  93             errors
  94         },
  95         {
  96             code: "var a = function() { return 1; }.bind(this)",
  97             output: "var a = function() { return 1; }",
  98             errors
  99         },
 100         {
 101             code: "var a = function() { (function(){ (function(){ this.d }.bind(c)) }) }.bind(b)",
 102             output: "var a = function() { (function(){ (function(){ this.d }.bind(c)) }) }",
 103             errors: [{ messageId: "unexpected", type: "CallExpression", column: 71 }]
 104         },
 105         {
 106             code: "var a = (function() { return 1; }).bind(this)",
 107             output: "var a = (function() { return 1; })",
 108             errors
 109         },
 110         {
 111             code: "var a = (function() { return 1; }.bind)(this)",
 112             output: "var a = (function() { return 1; })",
 113             errors
 114         },
 115
 116         // Should not autofix if bind expression args have side effects
 117         {
 118             code: "var a = function() {}.bind(b++)",
 119             output: null,
 120             errors
 121         },
 122         {
 123             code: "var a = function() {}.bind(b())",
 124             output: null,
 125             errors
 126         },
 127         {
 128             code: "var a = function() {}.bind(b.c)",
 129             output: null,
 130             errors
 131         },
 132
 133         // Should not autofix if it would remove comments
 134         {
 135             code: "var a = function() {}/**/.bind(b)",
 136             output: "var a = function() {}/**/",
 137             errors
 138         },
 139         {
 140             code: "var a = function() {}/**/['bind'](b)",
 141             output: "var a = function() {}/**/",
 142             errors
 143         },
 144         {
 145             code: "var a = function() {}//comment\n.bind(b)",
 146             output: "var a = function() {}//comment\n",
 147             errors
 148         },
 149         {
 150             code: "var a = function() {}./**/bind(b)",
 151             output: null,
 152             errors
 153         },
 154         {
 155             code: "var a = function() {}[/**/'bind'](b)",
 156             output: null,
 157             errors
 158         },
 159         {
 160             code: "var a = function() {}.//\nbind(b)",
 161             output: null,
 162             errors
 163         },
 164         {
 165             code: "var a = function() {}.bind/**/(b)",
 166             output: null,
 167             errors
 168         },
 169         {
 170             code: "var a = function() {}.bind(\n/**/b)",
 171             output: null,
 172             errors
 173         },
 174         {
 175             code: "var a = function() {}.bind(b/**/)",
 176             output: null,
 177             errors
 178         },
 179         {
 180             code: "var a = function() {}.bind(b//\n)",
 181             output: null,
 182             errors
 183         },
 184         {
 185             code: "var a = function() {}.bind(b\n/**/)",
 186             output: null,
 187             errors
 188         },
 189         {
 190             code: "var a = function() {}.bind(b)/**/",
 191             output: "var a = function() {}/**/",
 192             errors
 193         },
 194
 195         // Optional chaining
 196         {
 197             code: "var a = function() { return 1; }.bind?.(b)",
 198             output: "var a = function() { return 1; }",
 199             parserOptions: { ecmaVersion: 2020 },
 200             errors: [{ messageId: "unexpected" }]
 201         },
 202         {
 203             code: "var a = function() { return 1; }?.bind(b)",
 204             output: "var a = function() { return 1; }",
 205             parserOptions: { ecmaVersion: 2020 },
 206             errors: [{ messageId: "unexpected" }]
 207         },
 208         {
 209             code: "var a = (function() { return 1; }?.bind)(b)",
 210             output: "var a = (function() { return 1; })",
 211             parserOptions: { ecmaVersion: 2020 },
 212             errors: [{ messageId: "unexpected" }]
 213         },
 214         {
 215             code: "var a = function() { return 1; }['bind']?.(b)",
 216             output: "var a = function() { return 1; }",
 217             parserOptions: { ecmaVersion: 2020 },
 218             errors: [{ messageId: "unexpected" }]
 219         },
 220         {
 221             code: "var a = function() { return 1; }?.['bind'](b)",
 222             output: "var a = function() { return 1; }",
 223             parserOptions: { ecmaVersion: 2020 },
 224             errors: [{ messageId: "unexpected" }]
 225         },
 226         {
 227             code: "var a = (function() { return 1; }?.['bind'])(b)",
 228             output: "var a = (function() { return 1; })",
 229             parserOptions: { ecmaVersion: 2020 },
 230             errors: [{ messageId: "unexpected" }]
 231         }
 232     ]
 233 });