/
no-shadow.js
1129 lines (1123 loc) · 39.8 KB
/
no-shadow.js
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/**
* @fileoverview Tests for no-shadow rule.
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-shadow"),
RuleTester = require("../../../lib/rule-tester/rule-tester"),
globals = require("globals");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester({
languageOptions: {
ecmaVersion: 5,
sourceType: "script"
}
});
ruleTester.run("no-shadow", rule, {
valid: [
"var a=3; function b(x) { a++; return x + a; }; setTimeout(function() { b(a); }, 0);",
"(function() { var doSomething = function doSomething() {}; doSomething() }())",
"var arguments;\nfunction bar() { }",
{ code: "var a=3; var b = (x) => { a++; return x + a; }; setTimeout(() => { b(a); }, 0);", languageOptions: { ecmaVersion: 6 } },
{ code: "class A {}", languageOptions: { ecmaVersion: 6 } },
{ code: "class A { constructor() { var a; } }", languageOptions: { ecmaVersion: 6 } },
{ code: "(function() { var A = class A {}; })()", languageOptions: { ecmaVersion: 6 } },
{ code: "{ var a; } var a;", languageOptions: { ecmaVersion: 6 } }, // this case reports `no-redeclare`, not shadowing.
{ code: "{ let a; } let a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "{ let a; } var a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "{ let a; } function a() {}", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "{ const a = 0; } const a = 1;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "{ const a = 0; } var a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "{ const a = 0; } function a() {}", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { let a; } let a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { let a; } var a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { let a; } function a() {}", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { var a; } let a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { var a; } var a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { var a; } function a() {}", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo(a) { } let a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo(a) { } var a;", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "function foo(a) { } function a() {}", options: [{ hoist: "never" }], languageOptions: { ecmaVersion: 6 } },
{ code: "{ let a; } let a;", languageOptions: { ecmaVersion: 6 } },
{ code: "{ let a; } var a;", languageOptions: { ecmaVersion: 6 } },
{ code: "{ const a = 0; } const a = 1;", languageOptions: { ecmaVersion: 6 } },
{ code: "{ const a = 0; } var a;", languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { let a; } let a;", languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { let a; } var a;", languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { var a; } let a;", languageOptions: { ecmaVersion: 6 } },
{ code: "function foo() { var a; } var a;", languageOptions: { ecmaVersion: 6 } },
{ code: "function foo(a) { } let a;", languageOptions: { ecmaVersion: 6 } },
{ code: "function foo(a) { } var a;", languageOptions: { ecmaVersion: 6 } },
"function foo() { var Object = 0; }",
{ code: "function foo() { var top = 0; }", languageOptions: { globals: globals.browser } },
{ code: "var Object = 0;", options: [{ builtinGlobals: true }] },
{ code: "var top = 0;", options: [{ builtinGlobals: true }], languageOptions: { globals: globals.browser } },
{ code: "function foo(cb) { (function (cb) { cb(42); })(cb); }", options: [{ allow: ["cb"] }] },
{ code: "class C { foo; foo() { let foo; } }", languageOptions: { ecmaVersion: 2022 } },
{ code: "class C { static { var x; } static { var x; } }", languageOptions: { ecmaVersion: 2022 } },
{ code: "class C { static { let x; } static { let x; } }", languageOptions: { ecmaVersion: 2022 } },
{ code: "class C { static { var x; { var x; /* redeclaration */ } } }", languageOptions: { ecmaVersion: 2022 } },
{ code: "class C { static { { var x; } { var x; /* redeclaration */ } } }", languageOptions: { ecmaVersion: 2022 } },
{ code: "class C { static { { let x; } { let x; } } }", languageOptions: { ecmaVersion: 2022 } },
{ code: "const a = [].find(a => a)", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const a = [].find(function(a) { return a; })", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const [a = [].find(a => true)] = dummy", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const { a = [].find(a => true) } = dummy", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "function func(a = [].find(a => true)) {}", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "for (const a in [].find(a => true)) {}", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "for (const a of [].find(a => true)) {}", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const a = [].map(a => true).filter(a => a === 'b')", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const a = [].map(a => true).filter(a => a === 'b').find(a => a === 'c')", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const { a } = (({ a }) => ({ a }))();", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const person = people.find(item => {const person = item.name; return person === 'foo'})", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var y = bar || foo(y => y);", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var y = bar && foo(y => y);", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var z = bar(foo(z => z));", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var z = boo(bar(foo(z => z)));", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var match = function (person) { return person.name === 'foo'; };\nconst person = [].find(match);", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const a = foo(x || (a => {}))", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const { a = 1 } = foo(a => {})", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const person = {...people.find((person) => person.firstName.startsWith('s'))}", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 2021 } },
{ code: "const person = { firstName: people.filter((person) => person.firstName.startsWith('s')).map((person) => person.firstName)[0]}", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 2021 } },
{ code: "() => { const y = foo(y => y); }", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const x = (x => x)()", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var y = bar || (y => y)();", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var y = bar && (y => y)();", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "var x = (x => x)((y => y)());", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const { a = 1 } = (a => {})()", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "() => { const y = (y => y)(); }", options: [{ ignoreOnInitialization: true }], languageOptions: { ecmaVersion: 6 } },
{ code: "const [x = y => y] = [].map(y => y)", languageOptions: { ecmaVersion: 6 } }
],
invalid: [
{
code: "function a(x) { var b = function c() { var x = 'foo'; }; }",
errors: [{
messageId: "noShadow",
data: {
name: "x",
shadowedLine: 1,
shadowedColumn: 12
},
type: "Identifier",
line: 1,
column: 44
}]
},
{
code: "var a = (x) => { var b = () => { var x = 'foo'; }; }",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "x",
shadowedLine: 1,
shadowedColumn: 10
},
type: "Identifier",
line: 1,
column: 38
}]
},
{
code: "function a(x) { var b = function () { var x = 'foo'; }; }",
errors: [{
messageId: "noShadow",
data: {
name: "x",
shadowedLine: 1,
shadowedColumn: 12
},
type: "Identifier",
line: 1,
column: 43
}]
},
{
code: "var x = 1; function a(x) { return ++x; }",
errors: [{
messageId: "noShadow",
data: {
name: "x",
shadowedLine: 1,
shadowedColumn: 5
},
type: "Identifier",
line: 1,
column: 23
}]
},
{
code: "var a=3; function b() { var a=10; }",
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 5
},
type: "Identifier"
}]
},
{
code: "var a=3; function b() { var a=10; }; setTimeout(function() { b(); }, 0);",
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 5
},
type: "Identifier"
}]
},
{
code: "var a=3; function b() { var a=10; var b=0; }; setTimeout(function() { b(); }, 0);",
errors: [
{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 5
},
type: "Identifier"
}, {
messageId: "noShadow",
data: {
name: "b",
shadowedLine: 1,
shadowedColumn: 19
},
type: "Identifier"
}
]
},
{
code: "var x = 1; { let x = 2; }",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "x",
shadowedLine: 1,
shadowedColumn: 5
},
type: "Identifier"
}]
},
{
code: "let x = 1; { const x = 2; }",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "x",
shadowedLine: 1,
shadowedColumn: 5
},
type: "Identifier"
}]
},
{
code: "{ let a; } function a() {}",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 21
},
type: "Identifier"
}]
},
{
code: "{ const a = 0; } function a() {}",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 27
},
type: "Identifier"
}]
},
{
code: "function foo() { let a; } function a() {}",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 36
},
type: "Identifier"
}]
},
{
code: "function foo() { var a; } function a() {}",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 36
},
type: "Identifier"
}]
},
{
code: "function foo(a) { } function a() {}",
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 30
},
type: "Identifier"
}]
},
{
code: "{ let a; } let a;",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 16
},
type: "Identifier"
}]
},
{
code: "{ let a; } var a;",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 16
},
type: "Identifier"
}]
},
{
code: "{ let a; } function a() {}",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 21
},
type: "Identifier"
}]
},
{
code: "{ const a = 0; } const a = 1;",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 24
},
type: "Identifier"
}]
},
{
code: "{ const a = 0; } var a;",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 22
},
type: "Identifier"
}]
},
{
code: "{ const a = 0; } function a() {}",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 27
},
type: "Identifier"
}]
},
{
code: "function foo() { let a; } let a;",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
shadowedColumn: 31
},
type: "Identifier"
}]
},
{
code: "function foo() { let a; } var a;",
options: [{ hoist: "all" }],
languageOptions: { ecmaVersion: 6 },
errors: [{
messageId: "noShadow",
data: {
name: "a",
shadowedLine: 1,
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