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no-unsafe-negation

NOTE: this rule is part of the 推荐 rule set.
Enable full set in deno.json:
{
  "lint": {
    "rules": {
      "tags": ["推荐"]
    }
  }
}
Enable full set using the Deno CLI:
deno lint --rules-tags=推荐
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-unsafe-negation"],
      "exclude": ["no-unsafe-negation"]
    }
  }
}

禁止将否定运算符 ! 作为关系运算符的左操作数。

出现在以下运算符左操作数中的 ! 运算符有时会由于运算符优先级而导致意外行为:

  • in 运算符
  • instanceof 运算符

例如,当开发者编写代码 !key in someObject 时,他们最有可能希望它的行为与 !(key in someObject) 一致,但实际上它表现得像 (!key) in someObject。这个 lint 规则会警告这种 ! 运算符的使用,以减少混淆。

无效:

if (!key in object) {}
if (!foo instanceof Foo) {}

有效:

if (!(key in object)) {}
if (!(foo instanceof Foo)) {}
if ((!key) in object) {}
if ((!foo) instanceof Foo) {}

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