Error empty block statement

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/*eslint no-empty: 2*/

if (foo) {         /*error Empty block statement.*/
}

while (foo) {      /*error Empty block statement.*/
}

switch(foo) {      /*error Empty switch statement.*/
}

try {
    doSomething();
} catch(ex) {      /*error Empty block statement.*/

} finally {        /*error Empty block statement.*/

}

/*eslint no-empty: 2*/

if (foo) {
    // empty
}

while (foo) {
    // test
}

try {
    doSomething();
} catch (ex) {
    // Do nothing
}

try {
    doSomething();
} finally {
    // Do nothing
}

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Disallow Empty Block Statements (no-empty)

Empty block statements usually occur due to refactoring that wasn’t completed, such as:

Empty block statements such as this are usually an indicator of an error, or at the very least, an indicator that some refactoring is likely needed.

This rule is aimed at eliminating empty block statements. While not technically an error, empty block statements can be a source of confusion when reading code. A block will not be considered a warning if it contains a comment line.

The following patterns are considered problems:

The following patterns are not considered problems:

Since you must always have at least a catch or a finally block for any try , it is common to have empty block statements when execution should continue regardless of error.

methods set to true will warn for empty methods. This option is set to false by default.

The following pattern is considered a problem when methods is set to true :

The following pattern is not considered a problem when methods is set to true :

When Not To Use It

If you intentionally use empty block statements then you can disable this rule.

Источник

Empty catch block and no-empty, // Do nothing doesn’t help #3315

Wow, a really bad title. Suggestions? 😆

I’m having an issue with the no-empty -rule. From the docs, putting in // Do nothing should make it not error, but I’m still getting the error.

Using eslint@1.0.0
eslint output:

The text was updated successfully, but these errors were encountered:

Thanks for the issue! We get a lot of issues, so this message is automatically posted to each one to help you check that you’ve included all of the information we need to help you.

Reporting a bug? Please be sure to include:

1. The version of ESLint you are using (run eslint -v )
2. The source code that caused the problem
3. The configuration you’re using (for the rule or your entire config file)
4. The actual ESLint output complete with line numbers

Requesting a new rule? Please be sure to include:

1. The use case for the rule — what is it trying to prevent or flag?
2. Whether the rule is trying to prevent an error or is purely stylistic
3. Why you believe this rule is generic enough to be included

Requesting a feature? Please be sure to include:

1. The problem you want to solve (don’t mention the solution)
2. Your take on the correct solution to problem

Including this information in your issue helps us to triage it and get you a response as quickly as possible.

Источник

no-empty

Запретить пустые утверждения блоков

Как отключить функцию отсутствия пробелов?

Что такое пустой блочный оператор?

Как отключить правило ESLint?

Как обойти ESLint?

Как написать пустую функцию?

Что делает пустое ()в Javascript?

Как вернуть пустую функцию?

«extends»: «eslint:recommended» property in a configuration file enables this rule’ onmousemove=»i18n(this)»>Свойство «extends»: «eslint:recommended» в файле конфигурации включает это правило .

Пустые блочные утверждения,хотя и не являются техническими ошибками,обычно возникают из-за незавершенного рефакторинга.Они могут вызвать путаницу при чтении кода.

Rule Details

catch or finally block of a try statement to indicate that execution should continue regardless of errors).» onmousemove=»i18n(this)»>Это правило запрещает использование пустых блоковых операторов. Это правило игнорирует блочные операторы, содержащие комментарий (например, в пустом блоке catch или finally в операторе try , чтобы указать, что выполнение должно продолжаться независимо от ошибок).

Примеры неправильного кода для этого правила:

Примеры правильного кода для этого правила:

Options

В этом правиле есть объектная опция для исключений:

• «allowEmptyCatch»: true allows empty catch clauses (that is, which do not contain a comment)’ onmousemove=»i18n(this)»> «allowEmptyCatch»: true разрешает пустые предложения catch (то есть те, которые не содержат комментариев)

allowEmptyCatch

< «allowEmptyCatch»: true >option:’ onmousemove=»i18n(this)»>Примеры дополнительного правильного кода для этого правила с параметром < «allowEmptyCatch»: true >:

Когда не использовать его

Если вы намеренно используете пустые блочные операторы,то можете отключить это правило.

Источник

Ignore catch block in the no-empty rule #2808

Problem

The following is very common pattern when you don’t care about an exception:

But it’s caught by the no-empty rule.

I want the rule to catch empty blocks, but ignore the catch block as it’s empty because it’s required by JS, not because I want it there.

I know I can put in a // empty comment there, but that feels like an unuseful reiteration of the obvious.

Possible solution 1

Ignore catch by default as it’s required to be empty and not really useful to require it not to be empty. This is the preferred solution.

Possible solution 2

Add an option that defines exceptions in the form of keywords:

The text was updated successfully, but these errors were encountered:

This has already been discussed at length here: #1841

tl;dr The rule used to omit catch by default, but then people were missing empty catches that should not have been empty and there was no way to differentiate. The best solution was to use a comment to mark the ones meant to be empty.

From reading that thread it seemed like everyone disagreed with your position. I realize it’s not a good default, but I thought ESLint favored configurability over being opinionated. This decision smells a lot like the latter. I don’t understand why a simple exceptions option is unacceptable.

The result of this is that the no-empty rule is useless for most user.

Sorry about not finding that ticket. I searched the issue tracker for a while before opening this.

@sindresorhus We provide a way to customize this behavior, if I’m not mistaken this code will lint just fine

Any comment inside a block will mark it as non-empty. Leaving comments in the cases where you used try catch but ignoring cache is a good idea, if somebody else is going to be looking at your code.
But in general, I do see your point.

@ilyavolodin I’m aware, as already explained in the issue description, but I don’t want to add an IMHO useless comment just to please ESLint.

From reading that thread it seemed like everyone disagreed with your position. I realize it’s not a good default, but I thought ESLint favored configurability over being opinionated. This decision smells a lot like the latter. I don’t understand why a simple exceptions option is unacceptable.

Being unopinionated doesn’t mean we automatically do everything everyone wants. It means we don’t prescribe styles or force you to do anything you don’t want to do. We also make no promises that your code will lint without any changes or that all of our rules are appropriate for all code. (Also discussed: #1841 (comment))

Here, we have provided a rule that you can choose to use or not use, and we have several ways of having one-off disabling of its warnings, including putting a comment in the block (an approach we use in other rules as well) or use eslint-disable comments. You also have the option of writing your own rule to use instead of this one.

The problem with adding an exception (and the exception we had at one time) is that there’s no way to distinguish intentional and unintentional empty catch blocks. This is a far more dangerous circumstance than any other, as swallowing errors can hide significant problems. I don’t like having an option that is this much of a landmine for developers, because I can tell you exactly what will happen: someone will miss a swallowed error using this exception and then they will come back and ask for a way to opt out of the exception somehow. In which case, we are now back to square one where we need comments to indicate which catch blocks should be omitted. This is exactly how #1841 came about.

This is part of our challenge, sometimes pure static analysis isn’t good enough to figure out intent and we need to do something to augment it.

At this point, I don’t see a good argument for adding an option that could result in false negatives. If you have an idea for solving the false negative problem with the exception you’re requesting, I’ll gladly consider it.

I don’t like having an option that is this much of a landmine for developers, because I can tell you exactly what will happen: someone will miss a swallowed error using this exception

The dev can just as easily disable the whole rule. Same result. The dev is in control of both. If you start thinking like this pretty much all the exceptions in the other rules are a mistake. Even ability to disable rules would be a mistake with that logic.

But it’s clear we’re seeing things differently, so I’m going to stop here, disable the rule, and look into making a plugin 🙂

Источник

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Источник

Disallow empty block statements

Empty block statements, while not technically errors, usually occur due to refactoring that wasn’t completed. They can cause confusion when reading code.

Rule Details

This rule disallows empty block statements. This rule ignores block statements which contain a comment (for example, in an empty catch or finally block of a try statement to indicate that execution should continue regardless of errors).

Examples of incorrect code for this rule:

/*eslint no-empty: "error"*/
if (foo) {
}
while (foo) {
}
switch(foo) {
}



  


                       
  



try {
    doSomething();
} catch(ex) {
} finally {
}

Examples of correct code for this rule:

/*eslint no-empty: "error"*/
if (foo) {
    // empty
}
while (foo) {
    /* empty */
}
try {
    doSomething();
} catch (ex) {
    // continue regardless of error
}
try {
    doSomething();
} finally {
    /* continue regardless of error */
}

Options

This rule has an object option for exceptions:

• "allowEmptyCatch": true allows empty catch clauses (that is, which do not contain a comment)

allowEmptyCatch

Examples of additional correct code for this rule with the { "allowEmptyCatch": true } option:

/* eslint no-empty: ["error", { "allowEmptyCatch": true }] */
try {
    doSomething();
} catch (ex) {}
try {
    doSomething();
}
catch (ex) {}
finally {
    /* continue regardless of error */
}

When Not To Use It

If you intentionally use empty block statements then you can disable this rule.

Version

This rule was introduced in ESLint v0.0.2.

Resources

• Rule source
• Tests source