no-empty-vitest-coverage-reporter

Disallow empty test.coverage.reporter arrays in Vitest config.

Rule catalog ID: R031

Targeted pattern scope

• vitest.config.*
• vitest.workspace.*
• vite.config.* when Vitest coverage options are used
• test.coverage.reporter

What this rule reports

This rule reports test.coverage.reporter: [].

Why this rule exists

An empty reporter list usually means no meaningful coverage report output is produced. This rule catches a high-impact but easy-to-miss coverage misconfiguration.

❌ Incorrect

import { defineConfig } from "vitest/config";

export default defineConfig({
    test: {
        coverage: {
            reporter: [],
        },
    },
});

✅ Correct

import { defineConfig } from "vitest/config";

export default defineConfig({
    test: {
        coverage: {
            reporter: ["text", "html"],
        },
    },
});

Behavior and migration notes

• this rule checks static empty arrays only
• it does not enforce any specific reporter choice

ESLint flat config example

import vite from "@typpi/eslint-plugin-vite";

export default [vite.configs.strict, vite.configs.vitest];

When not to use it

Disable this rule only if your coverage reporting is fully delegated to runtime CLI flags and committed reporter arrays are intentionally empty placeholders.

Package documentation

• Vitest config reference

Further reading

• no-empty-vitest-coverage-reports-directory