--- description: 'Require unary negation to take a number.' --- import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem'; > 🛑 This file is source code, not the primary documentation location! 🛑 > > See **https://typescript-eslint.io/rules/no-unsafe-unary-minus** for documentation. TypeScript does not prevent you from putting a minus sign before things other than numbers: ```ts const s = 'hello'; const x = -s; // x is NaN ``` This rule restricts the unary `-` operator to `number | bigint`. ## Examples ```ts declare const a: string; -a; declare const b: {}; -b; ``` ```ts -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; ``` {/* Intentionally Omitted: When Not To Use It */}