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Consider to disallow extra boolean casts

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 (!!) is unnecessary.

CheckId SPC018905
TypeName NoExtraBooleanCasts
Severity Warning
Type JavaScriptFile

Bad Practice

if(!!foo) {
  return false;

Good Practice
if(foo) {
  return true;
if(!foo) {
  return false;

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