eslint/no-extra-boolean-cast Correctness ​
What it does ​
This rule disallows unnecessary boolean casts.
Why is this bad? ​
In contexts such as an if statement’s test where the result of the expression will already be coerced to a Boolean, casting to a Boolean via double negation (!!) or a Boolean call is unnecessary.
Example ​
javascript
var foo = !!!bar;
var foo = Boolean(!!bar);
if (!!foo) {
}
if (Boolean(foo)) {
}
// with "enforceForLogicalOperands" option enabled
if (!!foo || bar) {
}