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no-underscore-dangle.js
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no-underscore-dangle.js
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/**
* @fileoverview Test for no-underscore-dangle rule
* @author Matt DuVall <http://www.mattduvall.com>
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-underscore-dangle"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("no-underscore-dangle", rule, {
valid: [
"var foo_bar = 1;",
"function foo_bar() {}",
"foo.bar.__proto__;",
"console.log(__filename); console.log(__dirname);",
"var _ = require('underscore');",
"var a = b._;",
"function foo(_bar) {}",
"function foo(bar_) {}",
"(function _foo() {})",
{ code: "function foo(_bar) {}", options: [{}] },
{ code: "function foo( _bar = 0) {}", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = { onClick(_bar) { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = { onClick(_bar = 0) { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (_bar) => {}", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (_bar = 0) => {}", parserOptions: { ecmaVersion: 6 } },
{ code: "function foo( ..._bar) {}", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (..._bar) => {}", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = { onClick(..._bar) { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "export default function() {}", parserOptions: { ecmaVersion: 6, sourceType: "module" } },
{ code: "var _foo = 1", options: [{ allow: ["_foo"] }] },
{ code: "var __proto__ = 1;", options: [{ allow: ["__proto__"] }] },
{ code: "foo._bar;", options: [{ allow: ["_bar"] }] },
{ code: "function _foo() {}", options: [{ allow: ["_foo"] }] },
{ code: "this._bar;", options: [{ allowAfterThis: true }] },
{ code: "class foo { constructor() { super._bar; } }", options: [{ allowAfterSuper: true }], parserOptions: { ecmaVersion: 6 } },
{ code: "class foo { _onClick() { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "class foo { onClick_() { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "const o = { _onClick() { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "const o = { onClick_() { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "const o = { _onClick() { } }", options: [{ allow: ["_onClick"], enforceInMethodNames: true }], parserOptions: { ecmaVersion: 6 } },
{ code: "const o = { _foo: 'bar' }", parserOptions: { ecmaVersion: 6 } },
{ code: "const o = { foo_: 'bar' }", parserOptions: { ecmaVersion: 6 } },
{ code: "this.constructor._bar", options: [{ allowAfterThisConstructor: true }] },
{ code: "const foo = { onClick(bar) { } }", parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (bar) => {}", parserOptions: { ecmaVersion: 6 } },
{ code: "function foo(_bar) {}", options: [{ allowFunctionParams: true }] },
{ code: "function foo( _bar = 0) {}", options: [{ allowFunctionParams: true }], parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = { onClick(_bar) { } }", options: [{ allowFunctionParams: true }], parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (_bar) => {}", options: [{ allowFunctionParams: true }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo(bar) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = { onClick(bar) { } }", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (bar) => {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo(_bar) {}", options: [{ allowFunctionParams: false, allow: ["_bar"] }] },
{ code: "const foo = { onClick(_bar) { } }", options: [{ allowFunctionParams: false, allow: ["_bar"] }], parserOptions: { ecmaVersion: 6 } },
{ code: "const foo = (_bar) => {}", options: [{ allowFunctionParams: false, allow: ["_bar"] }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo([_bar]) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo([_bar] = []) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo( { _bar }) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo( { _bar = 0 } = {}) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 } },
{ code: "function foo(...[_bar]) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 2016 } },
{ code: "class foo { _field; }", parserOptions: { ecmaVersion: 2022 } },
{ code: "class foo { #_field; }", parserOptions: { ecmaVersion: 2022 } }
],
invalid: [
{ code: "var _foo = 1", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_foo" }, type: "VariableDeclarator" }] },
{ code: "var foo_ = 1", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "foo_" }, type: "VariableDeclarator" }] },
{ code: "function _foo() {}", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_foo" }, type: "FunctionDeclaration" }] },
{ code: "function foo_() {}", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "foo_" }, type: "FunctionDeclaration" }] },
{ code: "var __proto__ = 1;", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "__proto__" }, type: "VariableDeclarator" }] },
{ code: "foo._bar;", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "MemberExpression" }] },
{ code: "this._prop;", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_prop" }, type: "MemberExpression" }] },
{ code: "class foo { constructor() { super._prop; } }", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_prop" }, type: "MemberExpression" }] },
{ code: "class foo { constructor() { this._prop; } }", options: [{ allowAfterSuper: true }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_prop" }, type: "MemberExpression" }] },
{ code: "class foo { _onClick() { } }", options: [{ enforceInMethodNames: true }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_onClick" }, type: "MethodDefinition" }] },
{ code: "class foo { onClick_() { } }", options: [{ enforceInMethodNames: true }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "onClick_" }, type: "MethodDefinition" }] },
{ code: "const o = { _onClick() { } }", options: [{ enforceInMethodNames: true }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_onClick" }, type: "Property" }] },
{ code: "const o = { onClick_() { } }", options: [{ enforceInMethodNames: true }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "onClick_" }, type: "Property" }] },
{ code: "this.constructor._bar", errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "MemberExpression" }] },
{ code: "function foo(_bar) {}", options: [{ allowFunctionParams: false }], errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "Identifier" }] },
{ code: "(function foo(_bar) {})", options: [{ allowFunctionParams: false }], errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "Identifier" }] },
{ code: "function foo(bar, _foo) {}", options: [{ allowFunctionParams: false }], errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_foo" }, type: "Identifier" }] },
{ code: "const foo = { onClick(_bar) { } }", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "Identifier" }] },
{ code: "const foo = (_bar) => {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "Identifier" }] },
{ code: "function foo(_bar = 0) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "AssignmentPattern" }] },
{ code: "const foo = { onClick(_bar = 0) { } }", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "AssignmentPattern" }] },
{ code: "const foo = (_bar = 0) => {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "AssignmentPattern" }] },
{ code: "function foo(..._bar) {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "RestElement" }] },
{ code: "const foo = { onClick(..._bar) { } }", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "RestElement" }] },
{ code: "const foo = (..._bar) => {}", options: [{ allowFunctionParams: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "_bar" }, type: "RestElement" }] },
{
code: "class foo { #_bar() {} }",
options: [{ enforceInMethodNames: true }],
parserOptions: { ecmaVersion: 2022 },
errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "#_bar" } }]
}, {
code: "class foo { #bar_() {} }",
options: [{ enforceInMethodNames: true }],
parserOptions: { ecmaVersion: 2022 },
errors: [{ messageId: "unexpectedUnderscore", data: { identifier: "#bar_" } }]
}
]
});