当您将方法用作布尔值时，是否存在打字稿夹住的规则会提醒您? [英] Is there a typescript-eslint rule that alerts you when you use a method as a boolean?

问题描述

在Javascript中，有时我会不小心写:

In Javascript, I sometimes accidentally write:

if (obj.method) {  // <-- bad
  ...
}

代替

if (obj.method()) { // <-- good
  ...
}

鉴于typescript-eslint是typeaware，是否存在检测此用法的规则?我想说的是99/100次，我不是想将这种方法用作布尔值.

Given that typescript-eslint is typeaware, is there a rule that detects this usage? I would say that 99/100 times, I am not trying to use the method as a boolean.

推荐答案

如果打开打字机的 strictNullChecks 编译器选项(或全部使用 strict 编译器选项)，TS会自动为您执行此特定检查！

If you turn on typescript's strictNullChecks compiler option (or the catch-all strict compiler option), TS will do this specific check for you automatically!

示例: https://www.typescriptlang.org/play/#code/CYUwxgNghgTiAEYD2A7AzgF3kgRgKwC54BveAWxAwAslgAKASiJySQhChXgF8AoXgJYAzeHVx4AdBWq0GJXvEXxe3IA

否则，如注释中提到的@ x4rf41一样，您可以使用短绒棉毛抓起它.
有两种打字稿保留规则，可以在这里为您提供帮助:

Otherwise as @x4rf41 mentioned in the comment, you can use a linter to catch it.
There are two typescript-eslint rules which will help you here:

• no-unnecessary-condition will ensure all your conditions are actually required (i.e. it would catch this case because the function is not nullable).
• strict-boolean-expressions will ensure all your if conditions are booleans (i.e. it would catch this case because the function is not a boolean).

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