noMisleadingInstantiator

诊断类别：lint/suspicious/noMisleadingInstantiator

¥Diagnostic Category: lint/suspicious/noMisleadingInstantiator

TypeScript and TSX

自从：v1.3.0

¥Since: v1.3.0

来源：

¥Sources:

与以下相同：@typescript-eslint/no-misused-new

¥Same as: @typescript-eslint/no-misused-new

强制在创建内置错误时传递消息值。

¥Enforce proper usage of new and constructor.

在 JavaScript 中，类利用 constructor 方法来初始化新实例。另一方面，TypeScript 接口可以描述具有 new() 方法签名的类类型，尽管这种模式在实际代码中并不常见。开发者，尤其是 JavaScript 或 TypeScript 新手，可能偶尔会混淆 constructor 和 new 的使用。此规则在以下情况下触发警告：

¥In JavaScript, classes utilize the constructor method to initialize a new instance. On the other hand, TypeScript interfaces can describe a class type with a new() method signature, though this pattern is not commonly seen in real-world code. Developers, especially those new to JavaScript or TypeScript, might occasionally confuse the use of constructor with new. This rule triggers warnings in the following scenarios:

当类具有名为 new 的方法时。

¥When a class has a method named new.
当接口定义返回接口类型的名为 constructor 或 new 的方法时。

¥When an interface defines a method named constructor or new that returns the interface type.
当类型别名具有 constructor 方法时。

¥When a type alias has a constructor method.

如果你有意想要一个带有 new 方法的类，并且你确信没有人会在你的代码中将其误认为是 constructor，则不应使用此规则。

¥You should not use this rule if you intentionally want a class with a new method, and you’re confident nobody working in your code will mistake it with an constructor.

示例

¥Examples

无效

¥Invalid

interface I {
  new (): I;
  constructor(): void;
}

code-block.ts:2:3 lint/suspicious/noMisleadingInstantiator ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Don’t use the new method in interfaces.
  
    1 │ interface I {
  > 2 │   new (): I;
      │   ^^^^^^^^^^
    3 │   constructor(): void;
    4 │ }
  
  ℹ new in an interface suggests it’s instantiable, which is incorrect. The returned type should different from the constructor’s type.

class C {
  new(): C;
}

code-block.ts:2:3 lint/suspicious/noMisleadingInstantiator ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Don’t use the new method in classes.
  
    1 │ class C {
  > 2 │   new(): C;
      │   ^^^^^^^^^
    3 │ }
    4 │ 
  
  ℹ new is typically used to instantiate objects. In classes, its usage can be misleading.

有效

¥Valid

declare class C {
  constructor();
}

interface I {
  new (): C;
}

noMisleadingInstantiator

示例

无效

有效

相关链接