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no-unsafe-unary-minus

Require unary negation to take a number.

✅

在 ESLint 配置 中扩展"plugin:@typescript-eslint/recommended-type-checked" 可启用此规则。

💭

该规则需要 类型信息 才能运行，但这会带来性能方面的权衡。

TypeScript 不会阻止你在数字以外的内容前添加减号：

¥TypeScript does not prevent you from putting a minus sign before things other than numbers:

const s = 'hello';
const x = -s; // x is NaN

此规则将一元 - 运算符限制为 number | bigint。

¥This rule restricts the unary - operator to number | bigint.

eslint.config.mjs
export default tseslint.config({
  rules: {
    "@typescript-eslint/no-unsafe-unary-minus": "error"
  }
});

在线运行试试这个规则 ↗

示例​

¥Examples

declare const a: string;
-a;

declare const b: {};
-b;
Open in Playground

选项​

该规则不可配置。

何时不使用它​

Type checked lint rules are more powerful than traditional lint rules, but also require configuring type checked linting.

See Troubleshooting > Linting with Type Information > Performance if you experience performance degradations after enabling type checked rules.

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