/
no-undef.js
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/
no-undef.js
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/**
* @fileoverview Tests for no-undef rule.
* @author Mark Macdonald
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-undef"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("no-undef", rule, {
valid: [
"var a = 1, b = 2; a;",
"/*global b*/ function f() { b; }",
{ code: "function f() { b; }", globals: { b: false } },
"/*global b a:false*/ a; function f() { b; a; }",
"function a(){} a();",
"function f(b) { b; }",
"var a; a = 1; a++;",
"var a; function f() { a = 1; }",
"/*global b:true*/ b++;",
"/*eslint-env browser*/ window;",
"/*eslint-env node*/ require(\"a\");",
"Object; isNaN();",
"toString()",
"hasOwnProperty()",
"function evilEval(stuffToEval) { var ultimateAnswer; ultimateAnswer = 42; eval(stuffToEval); }",
"typeof a",
"typeof (a)",
"var b = typeof a",
"typeof a === 'undefined'",
"if (typeof a === 'undefined') {}",
{ code: "function foo() { var [a, b=4] = [1, 2]; return {a, b}; }", parserOptions: { ecmaVersion: 6 } },
{ code: "var toString = 1;", parserOptions: { ecmaVersion: 6 } },
{ code: "function myFunc(...foo) { return foo;}", parserOptions: { ecmaVersion: 6 } },
{ code: "var React, App, a=1; React.render(<App attr={a} />);", parserOptions: { ecmaVersion: 6, ecmaFeatures: { jsx: true } } },
{ code: "var console; [1,2,3].forEach(obj => {\n console.log(obj);\n});", parserOptions: { ecmaVersion: 6 } },
{ code: "var Foo; class Bar extends Foo { constructor() { super(); }}", parserOptions: { ecmaVersion: 6 } },
{ code: "import Warning from '../lib/warning'; var warn = new Warning('text');", parserOptions: { ecmaVersion: 6, sourceType: "module" } },
{ code: "import * as Warning from '../lib/warning'; var warn = new Warning('text');", parserOptions: { ecmaVersion: 6, sourceType: "module" } },
{ code: "var a; [a] = [0];", parserOptions: { ecmaVersion: 6 } },
{ code: "var a; ({a} = {});", parserOptions: { ecmaVersion: 6 } },
{ code: "var a; ({b: a} = {});", parserOptions: { ecmaVersion: 6 } },
{ code: "var obj; [obj.a, obj.b] = [0, 1];", parserOptions: { ecmaVersion: 6 } },
{ code: "URLSearchParams;", env: { browser: true } },
{ code: "Intl;", env: { browser: true } },
{ code: "IntersectionObserver;", env: { browser: true } },
{ code: "Credential;", env: { browser: true } },
{ code: "requestIdleCallback;", env: { browser: true } },
{ code: "customElements;", env: { browser: true } },
{ code: "PromiseRejectionEvent;", env: { browser: true } },
{ code: "(foo, bar) => { foo ||= WeakRef; bar ??= FinalizationRegistry; }", env: { es2021: true } },
// Notifications of readonly are removed: https://github.com/eslint/eslint/issues/4504
"/*global b:false*/ function f() { b = 1; }",
{ code: "function f() { b = 1; }", globals: { b: false } },
"/*global b:false*/ function f() { b++; }",
"/*global b*/ b = 1;",
"/*global b:false*/ var b = 1;",
"Array = 1;",
// new.target: https://github.com/eslint/eslint/issues/5420
{ code: "class A { constructor() { new.target; } }", parserOptions: { ecmaVersion: 6 } },
// Rest property
{
code: "var {bacon, ...others} = stuff; foo(others)",
parserOptions: {
ecmaVersion: 2018
},
globals: { stuff: false, foo: false }
},
// export * as ns from "source"
{
code: 'export * as ns from "source"',
parserOptions: { ecmaVersion: 2020, sourceType: "module" }
},
// import.meta
{
code: "import.meta",
parserOptions: { ecmaVersion: 2020, sourceType: "module" }
},
// class static blocks
{
code: "let a; class C { static {} } a;",
parserOptions: { ecmaVersion: 2022 },
errors: [{ messageId: "undef", data: { name: "a" } }]
},
{
code: "var a; class C { static {} } a;",
parserOptions: { ecmaVersion: 2022 },
errors: [{ messageId: "undef", data: { name: "a" } }]
},
{
code: "a; class C { static {} } var a;",
parserOptions: { ecmaVersion: 2022 },
errors: [{ messageId: "undef", data: { name: "a" } }]
},
{
code: "class C { static { C; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "const C = class { static { C; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { a; } } var a;",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { a; } } let a;",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { var a; a; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { a; var a; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { a; { var a; } } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { let a; a; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { a; let a; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { function a() {} a; } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
},
{
code: "class C { static { a; function a() {} } }",
parserOptions: { ecmaVersion: 2022, sourceType: "module" }
}
],
invalid: [
{ code: "a = 1;", errors: [{ messageId: "undef", data: { name: "a" }, type: "Identifier" }] },
{ code: "if (typeof anUndefinedVar === 'string') {}", options: [{ typeof: true }], errors: [{ messageId: "undef", data: { name: "anUndefinedVar" }, type: "Identifier" }] },
{ code: "var a = b;", errors: [{ messageId: "undef", data: { name: "b" }, type: "Identifier" }] },
{ code: "function f() { b; }", errors: [{ messageId: "undef", data: { name: "b" }, type: "Identifier" }] },
{ code: "window;", errors: [{ messageId: "undef", data: { name: "window" }, type: "Identifier" }] },
{ code: "require(\"a\");", errors: [{ messageId: "undef", data: { name: "require" }, type: "Identifier" }] },
{ code: "var React; React.render(<img attr={a} />);", parserOptions: { ecmaVersion: 6, ecmaFeatures: { jsx: true } }, errors: [{ messageId: "undef", data: { name: "a" } }] },
{ code: "var React, App; React.render(<App attr={a} />);", parserOptions: { ecmaVersion: 6, ecmaFeatures: { jsx: true } }, errors: [{ messageId: "undef", data: { name: "a" } }] },
{ code: "[a] = [0];", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "undef", data: { name: "a" } }] },
{ code: "({a} = {});", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "undef", data: { name: "a" } }] },
{ code: "({b: a} = {});", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "undef", data: { name: "a" } }] },
{ code: "[obj.a, obj.b] = [0, 1];", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "undef", data: { name: "obj" } }, { messageId: "undef", data: { name: "obj" } }] },
// Experimental
{
code: "const c = 0; const a = {...b, c};",
parserOptions: {
ecmaVersion: 2018
},
errors: [{ messageId: "undef", data: { name: "b" } }]
},
// class static blocks
{
code: "class C { static { a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" } }]
},
{
code: "class C { static { { let a; } a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 31 }]
},
{
code: "class C { static { { function a() {} } a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 40 }]
},
{
code: "class C { static { function foo() { var a; } a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 47 }]
},
{
code: "class C { static { var a; } static { a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 38 }]
},
{
code: "class C { static { let a; } static { a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 38 }]
},
{
code: "class C { static { function a(){} } static { a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 46 }]
},
{
code: "class C { static { var a; } foo() { a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 37 }]
},
{
code: "class C { static { let a; } foo() { a; } }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 37 }]
},
{
code: "class C { static { var a; } [a]; }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 30 }]
},
{
code: "class C { static { let a; } [a]; }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 30 }]
},
{
code: "class C { static { function a() {} } [a]; }",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 39 }]
},
{
code: "class C { static { var a; } } a;",
parserOptions: {
ecmaVersion: 2022
},
errors: [{ messageId: "undef", data: { name: "a" }, column: 31 }]
}
]
});