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no-extra-parens.js
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no-extra-parens.js
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/**
* @fileoverview Disallow parenthesesisng higher precedence subexpressions.
* @author Michael Ficarra
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-extra-parens"),
{ RuleTester } = require("../../../lib/rule-tester");
/**
* Create error message object for failure cases
* @param {string} code source code
* @param {string} output fixed source code
* @param {string} type node type
* @param {int} line line number
* @param {Object} config rule configuration
* @returns {Object} result object
* @private
*/
function invalid(code, output, type, line, config) {
const result = {
code,
output,
parserOptions: config && config.parserOptions || {},
errors: [
{
messageId: "unexpected",
type
}
],
options: config && config.options || []
};
if (line) {
result.errors[0].line = line;
}
return result;
}
const ruleTester = new RuleTester({
parserOptions: {
ecmaVersion: 2020,
ecmaFeatures: {
jsx: true
}
}
});
ruleTester.run("no-extra-parens", rule, {
valid: [
// all precedence boundaries
"foo",
"a = b, c = d",
"a = b ? c : d",
"a = (b, c)",
"a || b ? c = d : e = f",
"(a = b) ? (c, d) : (e, f)",
"a && b || c && d",
"(a ? b : c) || (d ? e : f)",
"a | b && c | d",
"(a || b) && (c || d)",
"a ^ b | c ^ d",
"(a && b) | (c && d)",
"a & b ^ c & d",
"(a | b) ^ (c | d)",
"a == b & c != d",
"(a ^ b) & (c ^ d)",
"a < b === c in d",
"(a & b) !== (c & d)",
"a << b >= c >>> d",
"(a == b) instanceof (c != d)",
"a + b << c - d",
"(a <= b) >> (c > d)",
"a * b + c / d",
"(a << b) - (c >> d)",
"+a % !b",
"(a + b) * (c - d)",
"-void+delete~typeof!a",
"!(a * b); typeof (a / b); +(a % b); delete (a * b); ~(a / b); void (a % b); -(a * b)",
"a(b = c, (d, e))",
"(++a)(b); (c++)(d);",
"new (A())",
"new (foo.Baz().foo)",
"new (foo.baz.bar().foo.baz)",
"new ({}.baz.bar.foo().baz)",
"new (doSomething().baz.bar().foo)",
"new ([][0].baz.foo().bar.foo)",
"new (foo\n.baz\n.bar()\n.foo.baz)",
"new A()()",
"(new A)()",
"(new (Foo || Bar))()",
"(new new foo())()",
"new (new new foo())(bar)",
"(new foo).bar",
"(new foo)[bar]",
"(new foo).bar.baz",
"(new foo.bar).baz",
"(new foo).bar()",
"(new foo.bar).baz()",
"new (new foo).bar",
"new (new foo.bar).baz",
"(new new foo()).baz",
"(2 + 3) ** 4",
"2 ** (2 + 3)",
"new (import(source))",
"import((s,t))",
// same precedence
"a, b, c",
"a = b = c",
"a ? b ? c : d : e",
"a ? b : c ? d : e",
"a || b || c",
"a || (b || c)",
"a && b && c",
"a && (b && c)",
"a | b | c",
"a | (b | c)",
"a ^ b ^ c",
"a ^ (b ^ c)",
"a & b & c",
"a & (b & c)",
"a == b == c",
"a == (b == c)",
"a < b < c",
"a < (b < c)",
"a << b << c",
"a << (b << c)",
"a + b + c",
"a + (b + c)",
"a * b * c",
"a * (b * c)",
"!!a; typeof +b; void -c; ~delete d;",
"a(b)",
"a(b)(c)",
"a((b, c))",
"new new A",
"2 ** 3 ** 4",
"(2 ** 3) ** 4",
// constructs that contain expressions
"if(a);",
"with(a){}",
"switch(a){ case 0: break; }",
"function a(){ return b; }",
"var a = () => { return b; }",
"throw a;",
"while(a);",
"do; while(a);",
"for(;;);",
"for(a in b);",
"for(a in b, c);",
"for(a of b);",
"for (a of (b, c));",
"var a = (b, c);",
"[]",
"[a, b]",
"!{a}",
"!{a: 0, b: 1}",
"!{[a]:0}",
"!{[(a, b)]:0}",
"!{a, ...b}",
"const {a} = {}",
"const {a:b} = {}",
"const {a:b=1} = {}",
"const {[a]:b} = {}",
"const {[a]:b=1} = {}",
"const {[(a, b)]:c} = {}",
"const {a, ...b} = {}",
"class foo {}",
"class foo { constructor(){} a(){} get b(){} set b(bar){} get c(){} set d(baz){} static e(){} }",
"class foo { [a](){} get [b](){} set [b](bar){} get [c](){} set [d](baz){} static [e](){} }",
"class foo { [(a,b)](){} }",
"class foo { a(){} [b](){} c(){} [(d,e)](){} }",
"class foo { [(a,b)](){} c(){} [d](){} e(){} }",
"const foo = class { constructor(){} a(){} get b(){} set b(bar){} get c(){} set d(baz){} static e(){} }",
// ExpressionStatement restricted productions
"({});",
"(function(){});",
"(let[a] = b);",
"(function*(){});",
"(class{});",
// special cases
"(0).a",
"(function(){ }())",
"({a: function(){}}.a());",
"({a:0}.a ? b : c)",
// RegExp literal is allowed to have parens (#1589)
"var isA = (/^a$/).test('a');",
"var regex = (/^a$/);",
"function a(){ return (/^a$/); }",
"function a(){ return (/^a$/).test('a'); }",
"var isA = ((/^a$/)).test('a');",
// IIFE is allowed to have parens in any position (#655)
"var foo = (function() { return bar(); }())",
"var o = { foo: (function() { return bar(); }()) };",
"o.foo = (function(){ return bar(); }());",
"(function(){ return bar(); }()), (function(){ return bar(); }())",
// IIFE is allowed to have outer parens (#1004)
"var foo = (function() { return bar(); })()",
"var o = { foo: (function() { return bar(); })() };",
"o.foo = (function(){ return bar(); })();",
"(function(){ return bar(); })(), (function(){ return bar(); })()",
"function foo() { return (function(){}()); }",
// parens are required around yield
"var foo = (function*() { if ((yield foo()) + 1) { return; } }())",
// arrow functions have the precedence of an assignment expression
"(() => 0)()",
"(_ => 0)()",
"_ => 0, _ => 1",
"a = () => b = 0",
"0 ? _ => 0 : _ => 0",
"(_ => 0) || (_ => 0)",
// Object literals as arrow function bodies need parentheses
"x => ({foo: 1})",
// Exponentiation operator `**`
"1 + 2 ** 3",
"1 - 2 ** 3",
"2 ** -3",
"(-2) ** 3",
"(+2) ** 3",
"+ (2 ** 3)",
// https://github.com/eslint/eslint/issues/5789
"a => ({b: c}[d])",
"a => ({b: c}.d())",
"a => ({b: c}.d.e)",
// "functions" enables reports for function nodes only
{ code: "(0)", options: ["functions"] },
{ code: "a + (b * c)", options: ["functions"] },
{ code: "(a)(b)", options: ["functions"] },
{ code: "a, (b = c)", options: ["functions"] },
{ code: "for(a in (0));", options: ["functions"] },
{ code: "var a = (b = c)", options: ["functions"] },
{ code: "_ => (a = 0)", options: ["functions"] },
// ["all", { conditionalAssign: false }] enables extra parens around conditional assignments
{ code: "while ((foo = bar())) {}", options: ["all", { conditionalAssign: false }] },
{ code: "if ((foo = bar())) {}", options: ["all", { conditionalAssign: false }] },
{ code: "do; while ((foo = bar()))", options: ["all", { conditionalAssign: false }] },
{ code: "for (;(a = b););", options: ["all", { conditionalAssign: false }] },
{ code: "var a = ((b = c)) ? foo : bar;", options: ["all", { conditionalAssign: false }] },
// ["all", { nestedBinaryExpressions: false }] enables extra parens around conditional assignments
{ code: "a + (b * c)", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "(a * b) + c", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "(a * b) / c", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "a || (b && c)", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "a + ((b * c))", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "((a * b)) + c", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "((a * b)) / c", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "a || ((b && c))", options: ["all", { nestedBinaryExpressions: false }] },
// ["all", { returnAssign: false }] enables extra parens around expressions returned by return statements
{ code: "function a(b) { return b || c; }", options: ["all", { returnAssign: false }] },
{ code: "function a(b) { return; }", options: ["all", { returnAssign: false }] },
{ code: "function a(b) { return (b = 1); }", options: ["all", { returnAssign: false }] },
{ code: "function a(b) { return (b = c) || (b = d); }", options: ["all", { returnAssign: false }] },
{ code: "function a(b) { return c ? (d = b) : (e = b); }", options: ["all", { returnAssign: false }] },
{ code: "b => b || c;", options: ["all", { returnAssign: false }] },
{ code: "b => (b = 1);", options: ["all", { returnAssign: false }] },
{ code: "b => (b = c) || (b = d);", options: ["all", { returnAssign: false }] },
{ code: "b => c ? (d = b) : (e = b);", options: ["all", { returnAssign: false }] },
{ code: "b => { return b || c };", options: ["all", { returnAssign: false }] },
{ code: "b => { return (b = 1) };", options: ["all", { returnAssign: false }] },
{ code: "b => { return (b = c) || (b = d) };", options: ["all", { returnAssign: false }] },
{ code: "b => { return c ? (d = b) : (e = b) };", options: ["all", { returnAssign: false }] },
{ code: "function a(b) { return ((b = 1)); }", options: ["all", { returnAssign: false }] },
{ code: "b => ((b = 1));", options: ["all", { returnAssign: false }] },
// https://github.com/eslint/eslint/issues/3653
"(function(){}).foo(), 1, 2;",
"(function(){}).foo++;",
"(function(){}).foo() || bar;",
"(function(){}).foo() + 1;",
"(function(){}).foo() ? bar : baz;",
"(function(){}).foo.bar();",
"(function(){}.foo());",
"(function(){}.foo.bar);",
"(class{}).foo(), 1, 2;",
"(class{}).foo++;",
"(class{}).foo() || bar;",
"(class{}).foo() + 1;",
"(class{}).foo() ? bar : baz;",
"(class{}).foo.bar();",
"(class{}.foo());",
"(class{}.foo.bar);",
// https://github.com/eslint/eslint/issues/4608
"function *a() { yield b; }",
"function *a() { yield yield; }",
"function *a() { yield b, c; }",
"function *a() { yield (b, c); }",
"function *a() { yield b + c; }",
"function *a() { (yield b) + c; }",
// https://github.com/eslint/eslint/issues/4229
[
"function a() {",
" return (",
" b",
" );",
"}"
].join("\n"),
[
"function a() {",
" return (",
" <JSX />",
" );",
"}"
].join("\n"),
[
"function a() {",
" return (",
" <></>",
" );",
"}"
].join("\n"),
[
"throw (",
" a",
");"
].join("\n"),
[
"function *a() {",
" yield (",
" b",
" );",
"}"
].join("\n"),
// async/await
"async function a() { await (a + b) }",
"async function a() { await (a + await b) }",
"async function a() { (await a)() }",
"async function a() { new (await a) }",
{ code: "(foo instanceof bar) instanceof baz", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "(foo in bar) in baz", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "(foo + bar) + baz", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "(foo && bar) && baz", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "foo instanceof (bar instanceof baz)", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "foo in (bar in baz)", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "foo + (bar + baz)", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "foo && (bar && baz)", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "((foo instanceof bar)) instanceof baz", options: ["all", { nestedBinaryExpressions: false }] },
{ code: "((foo in bar)) in baz", options: ["all", { nestedBinaryExpressions: false }] },
// https://github.com/eslint/eslint/issues/9019
"(async function() {});",
"(async function () { }());",
// ["all", { ignoreJSX: "all" }]
{ code: "const Component = (<div />)", options: ["all", { ignoreJSX: "all" }] },
{
code: [
"const Component = (<>",
" <p />",
"</>);"
].join("\n"),
options: ["all", { ignoreJSX: "all" }]
},
{
code: [
"const Component = (<div>",
" <p />",
"</div>);"
].join("\n"),
options: ["all", { ignoreJSX: "all" }]
},
{
code: [
"const Component = (",
" <div />",
");"
].join("\n"),
options: ["all", { ignoreJSX: "all" }]
},
{
code: [
"const Component =",
" (<div />)"
].join("\n"),
options: ["all", { ignoreJSX: "all" }]
},
// ["all", { ignoreJSX: "single-line" }]
{ code: "const Component = (<div />);", options: ["all", { ignoreJSX: "single-line" }] },
{
code: [
"const Component = (",
" <div />",
");"
].join("\n"),
options: ["all", { ignoreJSX: "single-line" }]
},
{
code: [
"const Component =",
"(<div />)"
].join("\n"),
options: ["all", { ignoreJSX: "single-line" }]
},
// ["all", { ignoreJSX: "multi-line" }]
{
code: [
"const Component = (",
"<div>",
" <p />",
"</div>",
");"
].join("\n"),
options: ["all", { ignoreJSX: "multi-line" }]
},
{
code: [
"const Component = (<div>",
" <p />",
"</div>);"
].join("\n"),
options: ["all", { ignoreJSX: "multi-line" }]
},
{
code: [
"const Component =",
"(<div>",
" <p />",
"</div>);"
].join("\n"),
options: ["all", { ignoreJSX: "multi-line" }]
},
{
code: [
"const Component = (<div",
" prop={true}",
"/>)"
].join("\n"),
options: ["all", { ignoreJSX: "multi-line" }]
},
// ["all", { enforceForArrowConditionals: false }]
{ code: "var a = b => 1 ? 2 : 3", options: ["all", { enforceForArrowConditionals: false }] },
{ code: "var a = (b) => (1 ? 2 : 3)", options: ["all", { enforceForArrowConditionals: false }] },
// ["all", { enforceForSequenceExpressions: false }]
{ code: "(a, b)", options: ["all", { enforceForSequenceExpressions: false }] },
{ code: "((a, b))", options: ["all", { enforceForSequenceExpressions: false }] },
{ code: "(foo(), bar());", options: ["all", { enforceForSequenceExpressions: false }] },
{ code: "((foo(), bar()));", options: ["all", { enforceForSequenceExpressions: false }] },
{ code: "if((a, b)){}", options: ["all", { enforceForSequenceExpressions: false }] },
{ code: "while ((val = foo(), val < 10));", options: ["all", { enforceForSequenceExpressions: false }] },
// ["all", { enforceForNewInMemberExpressions: false }]
{ code: "(new foo()).bar", options: ["all", { enforceForNewInMemberExpressions: false }] },
{ code: "(new foo())[bar]", options: ["all", { enforceForNewInMemberExpressions: false }] },
{ code: "(new foo()).bar()", options: ["all", { enforceForNewInMemberExpressions: false }] },
{ code: "(new foo(bar)).baz", options: ["all", { enforceForNewInMemberExpressions: false }] },
{ code: "(new foo.bar()).baz", options: ["all", { enforceForNewInMemberExpressions: false }] },
{ code: "(new foo.bar()).baz()", options: ["all", { enforceForNewInMemberExpressions: false }] },
{ code: "((new foo.bar())).baz()", options: ["all", { enforceForNewInMemberExpressions: false }] },
"let a = [ ...b ]",
"let a = { ...b }",
{
code: "let a = { ...b }",
parserOptions: { ecmaVersion: 2018 }
},
"let a = [ ...(b, c) ]",
"let a = { ...(b, c) }",
{
code: "let a = { ...(b, c) }",
parserOptions: { ecmaVersion: 2018 }
},
"var [x = (1, foo)] = bar",
"class A extends B {}",
"const A = class extends B {}",
"class A extends (B=C) {}",
"const A = class extends (B=C) {}",
"class A extends (++foo) {}",
"() => ({ foo: 1 })",
"() => ({ foo: 1 }).foo",
"() => ({ foo: 1 }.foo().bar).baz.qux()",
"() => ({ foo: 1 }.foo().bar + baz)",
{
code: "export default (function(){}).foo",
parserOptions: { ecmaVersion: 6, sourceType: "module" }
},
{
code: "export default (class{}).foo",
parserOptions: { ecmaVersion: 6, sourceType: "module" }
},
"({}).hasOwnProperty.call(foo, bar)",
"({}) ? foo() : bar()",
"({}) + foo",
"(function(){}) + foo",
"(let)\nfoo",
"(let[foo]) = 1", // setting the 'foo' property of the 'let' variable to 1
{
code: "((function(){}).foo.bar)();",
options: ["functions"]
},
{
code: "((function(){}).foo)();",
options: ["functions"]
},
"(let)[foo]",
"for ((let) in foo);",
"for ((let[foo]) in bar);",
"for ((let)[foo] in bar);",
"for ((let[foo].bar) in baz);",
// https://github.com/eslint/eslint/issues/11706 (also in invalid[])
"for (let a = (b in c); ;);",
"for (let a = (b && c in d); ;);",
"for (let a = (b in c && d); ;);",
"for (let a = (b => b in c); ;);",
"for (let a = b => (b in c); ;);",
"for (let a = (b in c in d); ;);",
"for (let a = (b in c), d = (e in f); ;);",
"for (let a = (b => c => b in c); ;);",
"for (let a = (b && c && d in e); ;);",
"for (let a = b && (c in d); ;);",
"for (let a = (b in c) && (d in e); ;);",
"for ((a in b); ;);",
"for (a = (b in c); ;);",
"for ((a in b && c in d && e in f); ;);",
"for (let a = [] && (b in c); ;);",
"for (let a = (b in [c]); ;);",
"for (let a = b => (c in d); ;);",
"for (let a = (b in c) ? d : e; ;);",
"for (let a = (b in c ? d : e); ;);",
"for (let a = b ? c : (d in e); ;);",
"for (let a = (b in c), d = () => { for ((e in f);;); for ((g in h);;); }; ;); for((i in j); ;);",
// https://github.com/eslint/eslint/issues/11706 regression tests (also in invalid[])
"for (let a = b; a; a); a; a;",
"for (a; a; a); a; a;",
"for (; a; a); a; a;",
"for (let a = (b && c) === d; ;);"
],
invalid: [
invalid("(0)", "0", "Literal"),
invalid("( 0 )", " 0 ", "Literal"),
invalid("if((0));", "if(0);", "Literal"),
invalid("if(( 0 ));", "if( 0 );", "Literal"),
invalid("with((0)){}", "with(0){}", "Literal"),
invalid("switch((0)){}", "switch(0){}", "Literal"),
invalid("switch(0){ case (1): break; }", "switch(0){ case 1: break; }", "Literal"),
invalid("for((0);;);", "for(0;;);", "Literal"),
invalid("for(;(0););", "for(;0;);", "Literal"),
invalid("for(;;(0));", "for(;;0);", "Literal"),
invalid("throw(0)", "throw 0", "Literal"),
invalid("while((0));", "while(0);", "Literal"),
invalid("do; while((0))", "do; while(0)", "Literal"),
invalid("for(a in (0));", "for(a in 0);", "Literal"),
invalid("for(a of (0));", "for(a of 0);", "Literal", 1),
invalid("const foo = {[(a)]:1}", "const foo = {[a]:1}", "Identifier", 1),
invalid("const foo = {[(a=b)]:1}", "const foo = {[a=b]:1}", "AssignmentExpression", 1),
invalid("const foo = {*[(Symbol.iterator)]() {}}", "const foo = {*[Symbol.iterator]() {}}", "MemberExpression", 1),
invalid("const foo = { get [(a)]() {}}", "const foo = { get [a]() {}}", "Identifier", 1),
invalid("const foo = {[(a+b)]:c, d}", "const foo = {[a+b]:c, d}", "BinaryExpression", 1),
invalid("const foo = {a, [(b+c)]:d, e}", "const foo = {a, [b+c]:d, e}", "BinaryExpression", 1),
invalid("const foo = {[(a+b)]:c, d:e}", "const foo = {[a+b]:c, d:e}", "BinaryExpression", 1),
invalid("const foo = {a:b, [(c+d)]:e, f:g}", "const foo = {a:b, [c+d]:e, f:g}", "BinaryExpression", 1),
invalid("const foo = {[(a+b)]:c, [d]:e}", "const foo = {[a+b]:c, [d]:e}", "BinaryExpression", 1),
invalid("const foo = {[a]:b, [(c+d)]:e, [f]:g}", "const foo = {[a]:b, [c+d]:e, [f]:g}", "BinaryExpression", 1),
invalid("const foo = {[(a+b)]:c, [(d,e)]:f}", "const foo = {[a+b]:c, [(d,e)]:f}", "BinaryExpression", 1),
invalid("const foo = {[(a,b)]:c, [(d+e)]:f, [(g,h)]:e}", "const foo = {[(a,b)]:c, [d+e]:f, [(g,h)]:e}", "BinaryExpression", 1),
invalid("const foo = {a, b:c, [(d+e)]:f, [(g,h)]:i, [j]:k}", "const foo = {a, b:c, [d+e]:f, [(g,h)]:i, [j]:k}", "BinaryExpression", 1),
invalid("const foo = {[a+(b*c)]:d}", "const foo = {[a+b*c]:d}", "BinaryExpression", 1),
invalid("const foo = {[(a, (b+c))]:d}", "const foo = {[(a, b+c)]:d}", "BinaryExpression", 1),
invalid("const {[(a)]:b} = {}", "const {[a]:b} = {}", "Identifier", 1),
invalid("const {[(a=b)]:c=1} = {}", "const {[a=b]:c=1} = {}", "AssignmentExpression", 1),
invalid("const {[(a+b)]:c, d} = {}", "const {[a+b]:c, d} = {}", "BinaryExpression", 1),
invalid("const {a, [(b+c)]:d, e} = {}", "const {a, [b+c]:d, e} = {}", "BinaryExpression", 1),
invalid("const {[(a+b)]:c, d:e} = {}", "const {[a+b]:c, d:e} = {}", "BinaryExpression", 1),
invalid("const {a:b, [(c+d)]:e, f:g} = {}", "const {a:b, [c+d]:e, f:g} = {}", "BinaryExpression", 1),
invalid("const {[(a+b)]:c, [d]:e} = {}", "const {[a+b]:c, [d]:e} = {}", "BinaryExpression", 1),
invalid("const {[a]:b, [(c+d)]:e, [f]:g} = {}", "const {[a]:b, [c+d]:e, [f]:g} = {}", "BinaryExpression", 1),
invalid("const {[(a+b)]:c, [(d,e)]:f} = {}", "const {[a+b]:c, [(d,e)]:f} = {}", "BinaryExpression", 1),
invalid("const {[(a,b)]:c, [(d+e)]:f, [(g,h)]:e} = {}", "const {[(a,b)]:c, [d+e]:f, [(g,h)]:e} = {}", "BinaryExpression", 1),
invalid("const {a, b:c, [(d+e)]:f, [(g,h)]:i, [j]:k} = {}", "const {a, b:c, [d+e]:f, [(g,h)]:i, [j]:k} = {}", "BinaryExpression", 1),
invalid("const {[a+(b*c)]:d} = {}", "const {[a+b*c]:d} = {}", "BinaryExpression", 1),
invalid("const {[(a, (b+c))]:d} = {}", "const {[(a, b+c)]:d} = {}", "BinaryExpression", 1),
invalid("class foo { [(a)](){} }", "class foo { [a](){} }", "Identifier"),
invalid("class foo {*[(Symbol.iterator)]() {}}", "class foo {*[Symbol.iterator]() {}}", "MemberExpression"),
invalid("class foo { get [(a)](){} }", "class foo { get [a](){} }", "Identifier"),
invalid("class foo { set [(a)](bar){} }", "class foo { set [a](bar){} }", "Identifier"),
invalid("class foo { static [(a)](bar){} }", "class foo { static [a](bar){} }", "Identifier"),
invalid("class foo { [(a=b)](){} }", "class foo { [a=b](){} }", "AssignmentExpression"),
invalid("class foo { constructor (){} [(a+b)](){} }", "class foo { constructor (){} [a+b](){} }", "BinaryExpression"),
invalid("class foo { [(a+b)](){} constructor (){} }", "class foo { [a+b](){} constructor (){} }", "BinaryExpression"),
invalid("class foo { [(a+b)](){} c(){} }", "class foo { [a+b](){} c(){} }", "BinaryExpression"),
invalid("class foo { a(){} [(b+c)](){} d(){} }", "class foo { a(){} [b+c](){} d(){} }", "BinaryExpression"),
invalid("class foo { [(a+b)](){} [c](){} }", "class foo { [a+b](){} [c](){} }", "BinaryExpression"),
invalid("class foo { [a](){} [(b+c)](){} [d](){} }", "class foo { [a](){} [b+c](){} [d](){} }", "BinaryExpression"),
invalid("class foo { [(a+b)](){} [(c,d)](){} }", "class foo { [a+b](){} [(c,d)](){} }", "BinaryExpression"),
invalid("class foo { [(a,b)](){} [(c+d)](){} }", "class foo { [(a,b)](){} [c+d](){} }", "BinaryExpression"),
invalid("class foo { [a+(b*c)](){} }", "class foo { [a+b*c](){} }", "BinaryExpression"),
invalid("const foo = class { [(a)](){} }", "const foo = class { [a](){} }", "Identifier"),
invalid(
"var foo = (function*() { if ((yield foo())) { return; } }())",
"var foo = (function*() { if (yield foo()) { return; } }())",
"YieldExpression",
1
),
invalid("f((0))", "f(0)", "Literal"),
invalid("f(0, (1))", "f(0, 1)", "Literal"),
invalid("!(0)", "!0", "Literal"),
invalid("a[(1)]", "a[1]", "Literal"),
invalid("(a)(b)", "a(b)", "Identifier"),
invalid("(async)", "async", "Identifier"),
invalid("(a, b)", "a, b", "SequenceExpression"),
invalid("var a = (b = c);", "var a = b = c;", "AssignmentExpression"),
invalid("function f(){ return (a); }", "function f(){ return a; }", "Identifier"),
invalid("[a, (b = c)]", "[a, b = c]", "AssignmentExpression"),
invalid("!{a: (b = c)}", "!{a: b = c}", "AssignmentExpression"),
invalid("typeof(0)", "typeof 0", "Literal"),
invalid("typeof (0)", "typeof 0", "Literal"),
invalid("typeof([])", "typeof[]", "ArrayExpression"),
invalid("typeof ([])", "typeof []", "ArrayExpression"),
invalid("typeof( 0)", "typeof 0", "Literal"),
invalid("typeof(typeof 5)", "typeof typeof 5", "UnaryExpression"),
invalid("typeof (typeof 5)", "typeof typeof 5", "UnaryExpression"),
invalid("+(+foo)", "+ +foo", "UnaryExpression"),
invalid("-(-foo)", "- -foo", "UnaryExpression"),
invalid("+(-foo)", "+-foo", "UnaryExpression"),
invalid("-(+foo)", "-+foo", "UnaryExpression"),
invalid("-((bar+foo))", "-(bar+foo)", "BinaryExpression"),
invalid("+((bar-foo))", "+(bar-foo)", "BinaryExpression"),
invalid("++(foo)", "++foo", "Identifier"),
invalid("--(foo)", "--foo", "Identifier"),
invalid("(a || b) ? c : d", "a || b ? c : d", "LogicalExpression"),
invalid("a ? (b = c) : d", "a ? b = c : d", "AssignmentExpression"),
invalid("a ? b : (c = d)", "a ? b : c = d", "AssignmentExpression"),
invalid("(c = d) ? (b) : c", "(c = d) ? b : c", "Identifier", null, { options: ["all", { conditionalAssign: false }] }),
invalid("(c = d) ? b : (c)", "(c = d) ? b : c", "Identifier", null, { options: ["all", { conditionalAssign: false }] }),
invalid("f((a = b))", "f(a = b)", "AssignmentExpression"),
invalid("a, (b = c)", "a, b = c", "AssignmentExpression"),
invalid("a = (b * c)", "a = b * c", "BinaryExpression"),
invalid("a + (b * c)", "a + b * c", "BinaryExpression"),
invalid("(a * b) + c", "a * b + c", "BinaryExpression"),
invalid("(a * b) / c", "a * b / c", "BinaryExpression"),
invalid("(2) ** 3 ** 4", "2 ** 3 ** 4", "Literal", null),
invalid("2 ** (3 ** 4)", "2 ** 3 ** 4", "BinaryExpression", null),
invalid("(2 ** 3)", "2 ** 3", "BinaryExpression", null),
invalid("(2 ** 3) + 1", "2 ** 3 + 1", "BinaryExpression", null),
invalid("1 - (2 ** 3)", "1 - 2 ** 3", "BinaryExpression", null),
invalid("-((2 ** 3))", "-(2 ** 3)", "BinaryExpression", null),
invalid("typeof ((a ** b));", "typeof (a ** b);", "BinaryExpression", null),
invalid("((-2)) ** 3", "(-2) ** 3", "UnaryExpression", null),
invalid("a = (b * c)", "a = b * c", "BinaryExpression", null, { options: ["all", { nestedBinaryExpressions: false }] }),
invalid("(b * c)", "b * c", "BinaryExpression", null, { options: ["all", { nestedBinaryExpressions: false }] }),
invalid("a = (b = c)", "a = b = c", "AssignmentExpression"),
invalid("(a).b", "a.b", "Identifier"),
invalid("(0)[a]", "0[a]", "Literal"),
invalid("(0.0).a", "0.0.a", "Literal"),
invalid("(0xBEEF).a", "0xBEEF.a", "Literal"),
invalid("(1e6).a", "1e6.a", "Literal"),
invalid("(0123).a", "0123.a", "Literal"),
invalid("a[(function() {})]", "a[function() {}]", "FunctionExpression"),
invalid("new (function(){})", "new function(){}", "FunctionExpression"),
invalid("new (\nfunction(){}\n)", "new \nfunction(){}\n", "FunctionExpression", 1),
invalid("((function foo() {return 1;}))()", "(function foo() {return 1;})()", "FunctionExpression"),
invalid("((function(){ return bar(); })())", "(function(){ return bar(); })()", "CallExpression"),
invalid("(foo()).bar", "foo().bar", "CallExpression"),
invalid("(foo.bar()).baz", "foo.bar().baz", "CallExpression"),
invalid("(foo\n.bar())\n.baz", "foo\n.bar()\n.baz", "CallExpression"),
invalid("(new foo()).bar", "new foo().bar", "NewExpression"),
invalid("(new foo())[bar]", "new foo()[bar]", "NewExpression"),
invalid("(new foo()).bar()", "new foo().bar()", "NewExpression"),
invalid("(new foo(bar)).baz", "new foo(bar).baz", "NewExpression"),
invalid("(new foo.bar()).baz", "new foo.bar().baz", "NewExpression"),
invalid("(new foo.bar()).baz()", "new foo.bar().baz()", "NewExpression"),
invalid("(a)()", "a()", "Identifier"),
invalid("(a.b)()", "a.b()", "MemberExpression"),
invalid("(a())()", "a()()", "CallExpression"),
invalid("(a.b())()", "a.b()()", "CallExpression"),
invalid("(a().b)()", "a().b()", "MemberExpression"),
invalid("(a().b.c)()", "a().b.c()", "MemberExpression"),
invalid("new (A)", "new A", "Identifier"),
invalid("(new A())()", "new A()()", "NewExpression"),
invalid("(new A(1))()", "new A(1)()", "NewExpression"),
invalid("((new A))()", "(new A)()", "NewExpression"),
invalid("new (foo\n.baz\n.bar\n.foo.baz)", "new foo\n.baz\n.bar\n.foo.baz", "MemberExpression"),
invalid("new (foo.baz.bar.baz)", "new foo.baz.bar.baz", "MemberExpression"),
invalid("0, (_ => 0)", "0, _ => 0", "ArrowFunctionExpression", 1),
invalid("(_ => 0), 0", "_ => 0, 0", "ArrowFunctionExpression", 1),
invalid("a = (_ => 0)", "a = _ => 0", "ArrowFunctionExpression", 1),
invalid("_ => (a = 0)", "_ => a = 0", "AssignmentExpression", 1),
invalid("x => (({}))", "x => ({})", "ObjectExpression", 1),
invalid("new (function(){})", "new function(){}", "FunctionExpression", null, { options: ["functions"] }),
invalid("new (\nfunction(){}\n)", "new \nfunction(){}\n", "FunctionExpression", 1, { options: ["functions"] }),
invalid("((function foo() {return 1;}))()", "(function foo() {return 1;})()", "FunctionExpression", null, { options: ["functions"] }),
invalid("a[(function() {})]", "a[function() {}]", "FunctionExpression", null, { options: ["functions"] }),
invalid("0, (_ => 0)", "0, _ => 0", "ArrowFunctionExpression", 1, { options: ["functions"] }),
invalid("(_ => 0), 0", "_ => 0, 0", "ArrowFunctionExpression", 1, { options: ["functions"] }),
invalid("a = (_ => 0)", "a = _ => 0", "ArrowFunctionExpression", 1, { options: ["functions"] }),
invalid("while ((foo = bar())) {}", "while (foo = bar()) {}", "AssignmentExpression"),
invalid("while ((foo = bar())) {}", "while (foo = bar()) {}", "AssignmentExpression", 1, { options: ["all", { conditionalAssign: true }] }),
invalid("if ((foo = bar())) {}", "if (foo = bar()) {}", "AssignmentExpression"),
invalid("do; while ((foo = bar()))", "do; while (foo = bar())", "AssignmentExpression"),
invalid("for (;(a = b););", "for (;a = b;);", "AssignmentExpression"),
// https://github.com/eslint/eslint/issues/3653
invalid("((function(){})).foo();", "(function(){}).foo();", "FunctionExpression"),
invalid("((function(){}).foo());", "(function(){}).foo();", "CallExpression"),
invalid("((function(){}).foo);", "(function(){}).foo;", "MemberExpression"),
invalid("0, (function(){}).foo();", "0, function(){}.foo();", "FunctionExpression"),
invalid("void (function(){}).foo();", "void function(){}.foo();", "FunctionExpression"),
invalid("++(function(){}).foo;", "++function(){}.foo;", "FunctionExpression"),
invalid("bar || (function(){}).foo();", "bar || function(){}.foo();", "FunctionExpression"),
invalid("1 + (function(){}).foo();", "1 + function(){}.foo();", "FunctionExpression"),
invalid("bar ? (function(){}).foo() : baz;", "bar ? function(){}.foo() : baz;", "FunctionExpression"),
invalid("bar ? baz : (function(){}).foo();", "bar ? baz : function(){}.foo();", "FunctionExpression"),
invalid("bar((function(){}).foo(), 0);", "bar(function(){}.foo(), 0);", "FunctionExpression"),
invalid("bar[(function(){}).foo()];", "bar[function(){}.foo()];", "FunctionExpression"),
invalid("var bar = (function(){}).foo();", "var bar = function(){}.foo();", "FunctionExpression"),
invalid("((class{})).foo();", "(class{}).foo();", "ClassExpression", null),
invalid("((class{}).foo());", "(class{}).foo();", "CallExpression", null),
invalid("((class{}).foo);", "(class{}).foo;", "MemberExpression", null),
invalid("0, (class{}).foo();", "0, class{}.foo();", "ClassExpression", null),
invalid("void (class{}).foo();", "void class{}.foo();", "ClassExpression", null),
invalid("++(class{}).foo;", "++class{}.foo;", "ClassExpression", null),
invalid("bar || (class{}).foo();", "bar || class{}.foo();", "ClassExpression", null),
invalid("1 + (class{}).foo();", "1 + class{}.foo();", "ClassExpression", null),
invalid("bar ? (class{}).foo() : baz;", "bar ? class{}.foo() : baz;", "ClassExpression", null),
invalid("bar ? baz : (class{}).foo();", "bar ? baz : class{}.foo();", "ClassExpression", null),
invalid("bar((class{}).foo(), 0);", "bar(class{}.foo(), 0);", "ClassExpression", null),
invalid("bar[(class{}).foo()];", "bar[class{}.foo()];", "ClassExpression", null),
invalid("var bar = (class{}).foo();", "var bar = class{}.foo();", "ClassExpression", null),
invalid("var foo = ((bar, baz));", "var foo = (bar, baz);", "SequenceExpression", null),
// https://github.com/eslint/eslint/issues/4608
invalid("function *a() { yield (b); }", "function *a() { yield b; }", "Identifier", null),
invalid("function *a() { (yield b), c; }", "function *a() { yield b, c; }", "YieldExpression", null),
invalid("function *a() { yield ((b, c)); }", "function *a() { yield (b, c); }", "SequenceExpression", null),
invalid("function *a() { yield (b + c); }", "function *a() { yield b + c; }", "BinaryExpression", null),
// https://github.com/eslint/eslint/issues/4229
invalid([
"function a() {",
" return (b);",
"}"
].join("\n"), [
"function a() {",
" return b;",
"}"
].join("\n"), "Identifier"),
invalid([
"function a() {",
" return",
" (b);",
"}"
].join("\n"), [
"function a() {",
" return",
" b;",
"}"
].join("\n"), "Identifier"),
invalid([
"function a() {",
" return ((",
" b",
" ));",
"}"
].join("\n"), [
"function a() {",
" return (",
" b",
" );",
"}"
].join("\n"), "Identifier"),
invalid([
"function a() {",
" return (<JSX />);",
"}"
].join("\n"), [
"function a() {",
" return <JSX />;",
"}"
].join("\n"), "JSXElement", null),
invalid([
"function a() {",
" return",
" (<JSX />);",
"}"
].join("\n"), [
"function a() {",
" return",
" <JSX />;",
"}"
].join("\n"), "JSXElement", null),
invalid([
"function a() {",
" return ((",
" <JSX />",
" ));",
"}"
].join("\n"), [
"function a() {",
" return (",
" <JSX />",
" );",
"}"
].join("\n"), "JSXElement", null),
invalid([
"function a() {",
" return ((",
" <></>",
" ));",
"}"
].join("\n"), [
"function a() {",
" return (",
" <></>",
" );",
"}"
].join("\n"), "JSXFragment", null),
invalid("throw (a);", "throw a;", "Identifier"),
invalid([
"throw ((",
" a",
"));"
].join("\n"), [
"throw (",
" a",
");"
].join("\n"), "Identifier"),
invalid([
"function *a() {",
" yield (b);",
"}"
].join("\n"), [
"function *a() {",
" yield b;",
"}"
].join("\n"), "Identifier", null),
invalid([
"function *a() {",
" yield",
" (b);",
"}"
].join("\n"), [
"function *a() {",
" yield",
" b;",
"}"
].join("\n"), "Identifier", null),
invalid([
"function *a() {",
" yield ((",
" b",
" ));",
"}"
].join("\n"), [
"function *a() {",
" yield (",
" b",
" );",
"}"
].join("\n"), "Identifier", null),
// returnAssign option
{
code: "function a(b) { return (b || c); }",
output: "function a(b) { return b || c; }",
options: ["all", { returnAssign: false }],
errors: [
{
messageId: "unexpected",
type: "LogicalExpression"
}
]
},
{
code: "function a(b) { return ((b = c) || (d = e)); }",
output: "function a(b) { return (b = c) || (d = e); }",
errors: [
{
messageId: "unexpected",
type: "LogicalExpression"
}
]
},
{
code: "function a(b) { return (b = 1); }",
output: "function a(b) { return b = 1; }",
errors: [
{
messageId: "unexpected",
type: "AssignmentExpression"
}
]
},
{
code: "function a(b) { return c ? (d = b) : (e = b); }",
output: "function a(b) { return c ? d = b : e = b; }",
errors: [
{
messageId: "unexpected",
type: "AssignmentExpression"
},
{
messageId: "unexpected",
type: "AssignmentExpression"
}
]
},
{
code: "b => (b || c);",
output: "b => b || c;",
options: ["all", { returnAssign: false }],
errors: [
{
messageId: "unexpected",
type: "LogicalExpression"
}
]
},
{
code: "b => ((b = c) || (d = e));",
output: "b => (b = c) || (d = e);",
errors: [
{
messageId: "unexpected",
type: "LogicalExpression"
}
]
},
{
code: "b => (b = 1);",
output: "b => b = 1;",
errors: [
{
messageId: "unexpected",
type: "AssignmentExpression"
}
]
},
{
code: "b => c ? (d = b) : (e = b);",
output: "b => c ? d = b : e = b;",
errors: [
{
messageId: "unexpected",
type: "AssignmentExpression"
},
{
messageId: "unexpected",
type: "AssignmentExpression"
}
]
},
{
code: "b => { return (b || c); }",
output: "b => { return b || c; }",
options: ["all", { returnAssign: false }],
errors: [
{
messageId: "unexpected",
type: "LogicalExpression"
}
]
},
{
code: "b => { return ((b = c) || (d = e)) };",
output: "b => { return (b = c) || (d = e) };",
errors: [
{
messageId: "unexpected",
type: "LogicalExpression"