typescript/prefer-as-const 正确性

✅ This rule is turned on by default.

🛠️ An auto-fix is available for this rule for some violations.

强制优先使用 as const，而不是字面量类型。

有两种常见方式可以告诉 TypeScript，一个字面量值应当被解释为其字面量类型（例如 2），而不是通用的基本类型（例如 number）；

as const：告诉 TypeScript 自动推断字面量类型 as 加字面量类型：显式告诉 TypeScript 该字面量类型

通常更推荐使用 as const，因为它不需要重新输入字面量值。当显式字面量类型的 as 可以被 as const 替换时，此规则会报告。

此规则的错误代码示例：

let bar: 2 = 2;
let foo = { bar: "baz" as "baz" };

此规则的正确代码示例：

let foo = "bar";
let foo = "bar" as const;
let foo: "bar" = "bar" as const;
let bar = "bar" as string;
let foo = { bar: "baz" };

如何使用

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)Config (oxlint.config.ts)CLI

json

{
  "rules": {
    "typescript/prefer-as-const": "error"
  }
}

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "typescript/prefer-as-const": "error",
  },
});

bash

oxlint --deny typescript/prefer-as-const

此规则是在 v0.0.8 中添加的。