no-wrap-func.md

title
no-wrap-func

Disallows unnecessary parentheses around function expressions.

::: important This rule was removed in ESLint v1.0.0 and replaced by the no-extra-parens rule. The "functions" option in the new rule is equivalent to the removed rule. :::

Although it's possible to wrap functions in parentheses, this can be confusing when the code also contains immediately-invoked function expressions (IIFEs) since parentheses are often used to make this distinction. For example:

var foo = (function() {
    // IIFE
}());

var bar = (function() {
    // not an IIFE
});

Rule Details

This rule will raise a warning when it encounters a function expression wrapped in parentheses with no following invoking parentheses.

Example of incorrect code for this rule:

::: incorrect

var a = (function() {/*...*/});

:::

Examples of correct code for this rule:

::: correct

var a = function() {/*...*/};

(function() {/*...*/})();

:::