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/
no-constant-condition.js
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/
no-constant-condition.js
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/**
* @fileoverview Tests for no-constant-condition rule.
* @author Christian Schulz <http://rndm.de>
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-constant-condition"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 2021 } });
ruleTester.run("no-constant-condition", rule, {
valid: [
"if(a);",
"if(a == 0);",
"if(a = f());",
"if(a += 1);",
"if(a |= 1);",
"if(a |= true);",
"if(a |= false);",
"if(a &= 1);",
"if(a &= true);",
"if(a &= false);",
"if(a >>= 1);",
"if(a >>= true);",
"if(a >>= false);",
"if(a >>>= 1);",
"if(a ??= 1);",
"if(a ??= true);",
"if(a ??= false);",
"if(a ||= b);",
"if(a ||= false);",
"if(a ||= 0);",
"if(a ||= void 0);",
"if(+(a ||= 1));",
"if(f(a ||= true));",
"if((a ||= 1) + 2);",
"if(1 + (a ||= true));",
"if(a ||= '' || false);",
"if(a ||= void 0 || null);",
"if((a ||= false) || b);",
"if(a || (b ||= false));",
"if((a ||= true) && b);",
"if(a && (b ||= true));",
"if(a &&= b);",
"if(a &&= true);",
"if(a &&= 1);",
"if(a &&= 'foo');",
"if((a &&= '') + false);",
"if('' + (a &&= null));",
"if(a &&= 1 && 2);",
"if((a &&= true) && b);",
"if(a && (b &&= true));",
"if((a &&= false) || b);",
"if(a || (b &&= false));",
"if(a ||= b ||= false);",
"if(a &&= b &&= true);",
"if(a ||= b &&= false);",
"if(a ||= b &&= true);",
"if(a &&= b ||= false);",
"if(a &&= b ||= true);",
"if(1, a);",
"if ('every' in []);",
"if (`\\\n${a}`) {}",
"if (`${a}`);",
"if (`${foo()}`);",
"if (`${a === 'b' && b==='a'}`);",
"if (`foo${a}` === 'fooa');",
"if (tag`a`);",
"if (tag`${a}`);",
"if (+(a || true));",
"if (-(a || true));",
"if (~(a || 1));",
"if (+(a && 0) === +(b && 0));",
"while(~!a);",
"while(a = b);",
"while(`${a}`);",
"for(;x < 10;);",
"for(;;);",
"for(;`${a}`;);",
"do{ }while(x)",
"q > 0 ? 1 : 2;",
"`${a}` === a ? 1 : 2",
"`foo${a}` === a ? 1 : 2",
"tag`a` === a ? 1 : 2",
"tag`${a}` === a ? 1 : 2",
"while(x += 3) {}",
"while(tag`a`) {}",
"while(tag`${a}`) {}",
"while(`\\\n${a}`) {}",
// #5228, typeof conditions
"if(typeof x === 'undefined'){}",
"if(`${typeof x}` === 'undefined'){}",
"if(a === 'str' && typeof b){}",
"typeof a == typeof b",
"typeof 'a' === 'string'|| typeof b === 'string'",
"`${typeof 'a'}` === 'string'|| `${typeof b}` === 'string'",
// #5726, void conditions
"if (void a || a);",
"if (a || void a);",
// #5693
"if(xyz === 'str1' && abc==='str2'){}",
"if(xyz === 'str1' || abc==='str2'){}",
"if(xyz === 'str1' || abc==='str2' && pqr === 5){}",
"if(typeof abc === 'string' && abc==='str2'){}",
"if(false || abc==='str'){}",
"if(true && abc==='str'){}",
"if(typeof 'str' && abc==='str'){}",
"if(abc==='str' || false || def ==='str'){}",
"if(true && abc==='str' || def ==='str'){}",
"if(true && typeof abc==='string'){}",
// #11181, string literals
"if('str1' && a){}",
"if(a && 'str'){}",
// #11306
"if ((foo || true) === 'baz') {}",
"if ((foo || 'bar') === 'baz') {}",
"if ((foo || 'bar') !== 'baz') {}",
"if ((foo || 'bar') == 'baz') {}",
"if ((foo || 'bar') != 'baz') {}",
"if ((foo || 233) > 666) {}",
"if ((foo || 233) < 666) {}",
"if ((foo || 233) >= 666) {}",
"if ((foo || 233) <= 666) {}",
"if ((key || 'k') in obj) {}",
"if ((foo || {}) instanceof obj) {}",
"if ((foo || 'bar' || 'bar') === 'bar');",
{
code: "if ((foo || 1n) === 'baz') {}",
parserOptions: { ecmaVersion: 11 }
},
{
code: "if (a && 0n || b);",
parserOptions: { ecmaVersion: 11 }
},
{
code: "if(1n && a){};",
parserOptions: { ecmaVersion: 11 }
},
// #12225
"if ('' + [y] === '' + [ty]) {}",
"if ('a' === '' + [ty]) {}",
"if ('' + [y, m, d] === 'a') {}",
"if ('' + [y, 'm'] === '' + [ty, 'tm']) {}",
"if ('' + [y, 'm'] === '' + ['ty']) {}",
"if ([,] in\n\n($2))\n ;\nelse\n ;",
"if ([...x]+'' === 'y'){}",
// { checkLoops: false }
{ code: "while(true);", options: [{ checkLoops: false }] },
{ code: "for(;true;);", options: [{ checkLoops: false }] },
{ code: "do{}while(true)", options: [{ checkLoops: false }] },
"function* foo(){while(true){yield 'foo';}}",
"function* foo(){for(;true;){yield 'foo';}}",
"function* foo(){do{yield 'foo';}while(true)}",
"function* foo(){while (true) { while(true) {yield;}}}",
"function* foo() {for (; yield; ) {}}",
"function* foo() {for (; ; yield) {}}",
"function* foo() {while (true) {function* foo() {yield;}yield;}}",
"function* foo() { for (let x = yield; x < 10; x++) {yield;}yield;}",
"function* foo() { for (let x = yield; ; x++) { yield; }}",
"if (new Number(x) + 1 === 2) {}",
// #15467
"if([a]==[b]) {}",
"if (+[...a]) {}",
"if (+[...[...a]]) {}",
"if (`${[...a]}`) {}",
"if (`${[a]}`) {}",
"if (+[a]) {}",
"if (0 - [a]) {}",
"if (1 * [a]) {}"
],
invalid: [
{ code: "for(;true;);", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "for(;``;);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "for(;`foo`;);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "for(;`foo${bar}`;);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "do{}while(true)", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "do{}while('1')", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "do{}while(0)", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "do{}while(t = -2)", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "do{}while(``)", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "do{}while(`foo`)", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "do{}while(`foo${bar}`)", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "true ? 1 : 2;", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "1 ? 1 : 2;", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "q = 0 ? 1 : 2;", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "(q = 0) ? 1 : 2;", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "`` ? 1 : 2;", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "`foo` ? 1 : 2;", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "`foo${bar}` ? 1 : 2;", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(-2);", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(true);", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(1);", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if({});", errors: [{ messageId: "unexpected", type: "ObjectExpression" }] },
{ code: "if(0 < 1);", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(0 || 1);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(a, 1);", errors: [{ messageId: "unexpected", type: "SequenceExpression" }] },
{ code: "if(`foo`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(``);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`\\\n`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`${'bar'}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`${'bar' + `foo`}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`foo${false || true}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`foo${0 || 1}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`foo${bar}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(`${bar}foo`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "if(!(true || a));", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(!(a && void b && c));", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(0 || !(a && null));", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(1 + !(a || true));", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(!(null && a) > 1);", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(+(!(a && 0)));", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(!typeof a === 'string');", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(-('foo' || a));", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(+(void a && b) === ~(1 || c));", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(a ||= true);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a ||= 5);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a ||= 'foo' || b);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a ||= b || /regex/);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a ||= b ||= true);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a ||= b ||= c || 1);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(!(a ||= true));", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(!(a ||= 'foo') === true);", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(!(a ||= 'foo') === false);", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(a || (b ||= true));", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if((a ||= 1) || b);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if((a ||= true) && true);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(true && (a ||= true));", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(a &&= false);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a &&= null);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a &&= void b);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a &&= 0 && b);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a &&= b && '');", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a &&= b &&= false);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a &&= b &&= c && false);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(!(a &&= false));", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(!(a &&= 0) + 1);", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(a && (b &&= false));", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if((a &&= null) && b);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(false || (a &&= false));", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if((a &&= false) || false);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "while([]);", errors: [{ messageId: "unexpected", type: "ArrayExpression" }] },
{ code: "while(~!0);", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "while(x = 1);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "while(function(){});", errors: [{ messageId: "unexpected", type: "FunctionExpression" }] },
{ code: "while(true);", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "while(1);", errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "while(() => {});", errors: [{ messageId: "unexpected", type: "ArrowFunctionExpression" }] },
{ code: "while(`foo`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "while(``);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "while(`${'foo'}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
{ code: "while(`${'foo' + 'bar'}`);", errors: [{ messageId: "unexpected", type: "TemplateLiteral" }] },
// #5228 , typeof conditions
{ code: "if(typeof x){}", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(typeof 'abc' === 'string'){}", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(a = typeof b){}", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(a, typeof b){}", errors: [{ messageId: "unexpected", type: "SequenceExpression" }] },
{ code: "if(typeof 'a' == 'string' || typeof 'b' == 'string'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "while(typeof x){}", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
// #5726, void conditions
{ code: "if(1 || void x);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(void x);", errors: [{ messageId: "unexpected", type: "UnaryExpression" }] },
{ code: "if(y = void x);", errors: [{ messageId: "unexpected", type: "AssignmentExpression" }] },
{ code: "if(x, void x);", errors: [{ messageId: "unexpected", type: "SequenceExpression" }] },
{ code: "if(void x === void y);", errors: [{ messageId: "unexpected", type: "BinaryExpression" }] },
{ code: "if(void x && a);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(a && void x);", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
// #5693
{ code: "if(false && abc==='str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(true || abc==='str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(1 || abc==='str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(abc==='str' || true){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(abc==='str' || true || def ==='str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(false || true){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(typeof abc==='str' || true){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
// #11181, string literals
{ code: "if('str' || a){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if('str' || abc==='str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if('str1' || 'str2'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if('str1' && 'str2'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(abc==='str' || 'str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{ code: "if(a || 'str'){}", errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
{
code: "function* foo(){while(true){} yield 'foo';}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function* foo(){while(true){if (true) {yield 'foo';}}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function* foo(){while(true){yield 'foo';} while(true) {}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "var a = function* foo(){while(true){} yield 'foo';}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "while (true) { function* foo() {yield;}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function* foo(){if (true) {yield 'foo';}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function* foo() {for (let foo = yield; true;) {}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function* foo() {for (foo = yield; true;) {}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function foo() {while (true) {function* bar() {while (true) {yield;}}}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function foo() {while (true) {const bar = function*() {while (true) {yield;}}}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
{
code: "function* foo() { for (let foo = 1 + 2 + 3 + (yield); true; baz) {}}",
errors: [{ messageId: "unexpected", type: "Literal" }]
},
// #12225
{
code: "if([a]) {}",
errors: [{ messageId: "unexpected", type: "ArrayExpression" }]
},
{
code: "if([]) {}",
errors: [{ messageId: "unexpected", type: "ArrayExpression" }]
},
{
code: "if(''+['a']) {}",
errors: [{ messageId: "unexpected", type: "BinaryExpression" }]
},
{
code: "if(''+[]) {}",
errors: [{ messageId: "unexpected", type: "BinaryExpression" }]
},
{
code: "if(+1) {}",
errors: [{ messageId: "unexpected", type: "UnaryExpression" }]
},
{
code: "if ([,] + ''){}",
errors: [{ messageId: "unexpected", type: "BinaryExpression" }]
},
// #13238
{ code: "if(/foo/ui);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0b0n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0o0n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0x0n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0b1n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0o1n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0x1n);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "Literal" }] },
{ code: "if(0x1n || foo);", parserOptions: { ecmaVersion: 11 }, errors: [{ messageId: "unexpected", type: "LogicalExpression" }] },
// Classes and instances are always truthy
{ code: "if(class {}) {}", errors: [{ messageId: "unexpected" }] },
{ code: "if(new Foo()) {}", errors: [{ messageId: "unexpected" }] },
// Boxed primitives are always truthy
{ code: "if(new Boolean(foo)) {}", errors: [{ messageId: "unexpected" }] },
{ code: "if(new String(foo)) {}", errors: [{ messageId: "unexpected" }] },
{ code: "if(new Number(foo)) {}", errors: [{ messageId: "unexpected" }] },
// Spreading a constant array
{ code: "if(`${[...['a']]}`) {}", errors: [{ messageId: "unexpected" }] }
]
});