noExplicitAny

TypeScript and TSX

摘要

¥Summary

规则生效日期：v1.0.0

¥Rule available since: v1.0.0
诊断类别：lint/suspicious/noExplicitAny

¥Diagnostic Category: lint/suspicious/noExplicitAny
此规则为推荐规则，默认启用。

¥This rule is recommended, which means is enabled by default.
此规则没有修复方案。

¥This rule doesn’t have a fix.
此规则的默认严重级别为 warning。

¥The default severity of this rule is warning.
来源：

¥Sources:
- 与 @typescript-eslint/no-explicit-any 相同
  
  ¥Same as @typescript-eslint/no-explicit-any

如何配置

¥How to configure

1
{
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  "linter": {
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    "rules": {
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      "suspicious": {
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        "noExplicitAny": "error"
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      }
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    }
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  }
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}

描述

¥Description

禁止使用 any 类型。

¥Disallow the any type usage.

TypeScript 中的 any 类型是类型系统中的危险 “应急方案”。使用 any 会禁用许多类型检查规则，通常最好只作为最后的手段或在原型代码时使用。

¥The any type in TypeScript is a dangerous “escape hatch” from the type system. Using any disables many type checking rules and is generally best used only as a last resort or when prototyping code.

TypeScript 的 --noImplicitAny 编译器选项可防止隐含的 any，但不会阻止 any 按照此规则的方式显式使用。

¥TypeScript’s --noImplicitAny compiler option prevents an implied any, but doesn’t prevent any from being explicitly used the way this rule does.

有时你可以使用类型 unknown 而不是类型 any。它还接受任何值，但是需要在调用属性之前检查属性是否存在。

¥Sometimes you can use the type unknown instead of the type any. It also accepts any value, however it requires to check that a property exists before calling it.

示例

¥Examples

无效

¥Invalid

1
let variable: any = 1;

code-block.ts:1:15 lint/suspicious/noExplicitAny ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Unexpected any. Specify a different type.
  
  > 1 │ let variable: any = 1;
      │               ^^^
    2 │ 
  
  ℹ any disables many type checking rules. Its use should be avoided.

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class SomeClass {
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   message: Array<Array<any>>;
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}

code-block.ts:2:25 lint/suspicious/noExplicitAny ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Unexpected any. Specify a different type.
  
    1 │ class SomeClass {
  > 2 │    message: Array<Array<any>>;
      │                         ^^^
    3 │ }
    4 │ 
  
  ℹ any disables many type checking rules. Its use should be avoided.

1
function fn(param: Array<any>): void {}

code-block.ts:1:26 lint/suspicious/noExplicitAny ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Unexpected any. Specify a different type.
  
  > 1 │ function fn(param: Array<any>): void {}
      │                          ^^^
    2 │ 
  
  ℹ any disables many type checking rules. Its use should be avoided.

有效

¥Valid

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let variable: number = 1;
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let variable2 = 1;

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class SomeClass<T extends any> {
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   message: Array<Array<unknown>>;
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}

1
function fn(param: Array<Array<unknown>>): Array<unknown> {}

noExplicitAny

摘要

如何配置

描述

示例

无效

有效

相关链接