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no-unsafe-unary-minus

Require unary negation to take a number.

💭

该规则需要 类型信息 才能运行。


TypeScript 不会阻止你在数字以外的内容前添加减号：

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

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

该规则将一元 - 运算符限制为 number | bigint。

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

.eslintrc.cjs
module.exports = {
  "rules": {
    "@typescript-eslint/no-unsafe-unary-minus": "error"
  }
};
在线运行试试这个规则 ↗

示例​

❌ 不正确​

declare const a: string;
-a;

declare const b: {};
-b;

✅ 正确​

-42;
-42n;

declare const a: number;
-a;

declare const b: number;
-b;

declare const c: number | bigint;
-c;

declare const d: any;
-d;

declare const e: 1 | 2;
-e;

选项​

该规则不可配置。

资源​