Skip to main content

method-signature-style

强制使用特定方法签名语法.

🔧

此规则报告的一些问题可通过 --fix ESLint 命令行选项自动修复。

TypeScript 提供了两种定义对象/接口函数属性的方法：

¥TypeScript provides two ways to define an object/interface function property:

interface Example {
  // method shorthand syntax
  func(arg: string): number;

  // regular property with function type
  func: (arg: string) => number;
}

两者非常相似；大多数时候，使用哪一个并不重要。

¥The two are very similar; most of the time it doesn't matter which one you use.

一种好的做法是使用 TypeScript 的 strict 选项（这意味着 strictFunctionTypes），它仅对函数属性启用正确的类型检查（方法签名会获得旧行为）。

¥A good practice is to use the TypeScript's strict option (which implies strictFunctionTypes) which enables correct typechecking for function properties only (method signatures get old behavior).

TypeScript 常见问题解答：

¥TypeScript FAQ:

同一类型的方法和函数属性的行为不同。在 strictFunctionTypes 下，方法的参数始终是双变的，而函数属性的参数是逆变的。

¥A method and a function property of the same type behave differently. Methods are always bivariant in their argument, while function properties are contravariant in their argument under strictFunctionTypes.

有关背后的原因，请参阅 编译器选项的 TypeScript PR。

¥See the reasoning behind that in the TypeScript PR for the compiler option.

eslint.config.mjs
export default tseslint.config({
  rules: {
    "@typescript-eslint/method-signature-style": "error"
  }
});

在线运行试试这个规则 ↗

选项​

该规则接受以下选项:

type Options = ['method' | 'property'];

const defaultOptions: Options = ['property'];

¥Options

此规则接受一个字符串选项：

¥This rule accepts one string option:

  • "property"：强制使用函数的属性签名。使用它与 TypeScript 的严格模式一起强制执行最大正确性。

    ¥"property": Enforce using property signature for functions. Use this to enforce maximum correctness together with TypeScript's strict mode.

  • "method"：强制使用函数的方法签名。如果你不使用 TypeScript 的严格模式并且更喜欢这种风格，请使用此选项。

    ¥"method": Enforce using method signature for functions. Use this if you aren't using TypeScript's strict mode and prefer this style.

property​

带有 property 选项的代码示例。

¥Examples of code with property option.

interface T1 {
  func(arg: string): number;
}
type T2 = {
  func(arg: boolean): void;
};
interface T3 {
  func(arg: number): void;
  func(arg: string): void;
  func(arg: boolean): void;
}
Open in Playground

method​

带有 method 选项的代码示例。

¥Examples of code with method option.

interface T1 {
  func: (arg: string) => number;
}
type T2 = {
  func: (arg: boolean) => void;
};
Open in Playground

何时不使用它​

¥When Not To Use It

如果你不想强制执行对象/接口函数类型的特定样式，和/或如果你不使用 strictFunctionTypes，那么你不需要此规则。

¥If you don't want to enforce a particular style for object/interface function types, and/or if you don't use strictFunctionTypes, then you don't need this rule.

但是，请记住，不一致的风格可能会损害项目的可读性。我们建议为此规则选择一个最适合你的项目的选项。

¥However, keep in mind that inconsistent style can harm readability in a project. We recommend picking a single option for this rule that works best for your project.

资源​