jshint根据函数是否无效给出“缺少分号”？

Question

I am using jshint in VSCode. jshint gives a "missing semicolon" warning at the end '}' of the function below

void function doSomething(){
    console.log('Hello, World');
}

And adding the semicolon satisfies jshint:

But after I remove void , the warning goes away without the semicolon:

void function doSomething(){
    console.log('Hello, World');
}

What is the logic behind this? More generally, is there official style guidance such as PEP8 in Python for Javascript addressing the best practice for semicolon?

Answer 1

With the linting rules you have:

• Function declarations do not need to be followed by a semi-colon.
• Expressions, including those which include a function expression, do.

By putting the void operator before the function keyword, you force it into expression context.

Since it is in expression context, you do nothing with the function in the expression, and you void the result, it becomes pointless. The expression doesn't do anything at all. It doesn't even create a variable with the function stored in it, which is why this errors:

 void function x() { console.log(1) }; x(); 

More generally, what's the best practice rule on semicolns in javascript?

A highly opinionated subject.