no-extra-boolean-cast

NOTE: this rule is part of the recommended rule set.

Enable full set in deno.json:

{
  "lint": {
    "rules": {
      "tags": ["recommended"]
    }
  }
}

Enable full set using the Deno CLI:

deno lint --rules-tags=recommended

This rule can be explictly included to or excluded from the rules present in the current tag by adding it to the include or exclude array in deno.json:

{
  "lint": {
    "rules": {
      "include": ["no-extra-boolean-cast"],
      "exclude": ["no-extra-boolean-cast"]
    }
  }
}

Disallows unnecessary boolean casts.

In certain contexts, such as if, while or for statements, expressions are automatically coerced into a boolean. Therefore, techniques such as double negation (!!foo) or casting (Boolean(foo)) are unnecessary and produce the same result as without the negation or casting.

Invalid:

if (!!foo) {}
if (Boolean(foo)) {}
while (!!foo) {}
for (; Boolean(foo);) {}

Valid:

if (foo) {}
while (foo) {}
for (; foo;) {}

no-extra-boolean-cast

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