#no-unsafe-unary-minus

#Configuration

import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/no-unsafe-unary-minus': 'error',
    },
  },
]);

#Rule Details

Disallow unary negation of a value that is not a number or bigint.

Applying the unary minus operator (-) to a value that is not a number or bigint type is a likely mistake. JavaScript will coerce the value to a number, often resulting in NaN. This rule ensures the operand of unary negation is always number or bigint.

Examples of incorrect code for this rule:

declare const str: string;
-str;

declare const bool: boolean;
-bool;

declare const obj: object;
-obj;

Examples of correct code for this rule:

-42;
-someNumber;

declare const big: bigint;
-big;

declare const val: number | bigint;
-val;

#Original Documentation

• typescript-eslint no-unsafe-unary-minus