type/no-unsafe-unary-minus

Disallow unary negation on non-number and non-bigint values.

Applies to: Type information in Vue SFC scripts and templates, for the constructs shown below.

This rule reads type information from your TypeScript project (tsconfig.json), so the configuration sets typeAware: true. typeAware does not turn on opt-in rules by itself.

Bad

label is a string, so the unary minus does not negate a number or bigint.

<script setup lang="ts">
const label = "a";
const negated = -label;
</script>

Good

count is a number, so the unary minus negates that number.

<script setup lang="ts">
const count = 1;
const negated = -count;
</script>

Configuration (Vite+)

import { defineConfig } from "@vizejs/vite-plugin/vite-plus";

export default defineConfig({}).withVue({
  linter: {
    "preset": "incremental",
    "rules": {
      "type/no-unsafe-unary-minus": "warn"
    },
    "typeAware": true
  },
});

Then run vp run lint.

Related

• Type and script rules
• All rules
• Source code