vitest-profiler-plugin

A Vitest plugin to profile test execution time.

Installation

npm install --save-dev vitest-profiler-plugin

Usage

Add the plugin to your vitest.config.js file:

import { defineConfig } from 'vitest/config'
import { profilerPlugin } from 'vitest-profiler-plugin'

export default defineConfig({
  plugins: [
    profilerPlugin(),
  ]
})

What it does

This plugin uses the v8-profiler-next library to generate CPU profiles for your tests.

For each test, a .cpuprofile file is generated in the test-profile directory. The file path mirrors the test file path and the test's suite structure.

Disabling the plugin

You can disable the plugin by setting the VITEST_PROFILER_DISABLE environment variable to a truthy value.

VITEST_PROFILER_DISABLE=1 vitest

Viewing the profiles

To examine the generated profile:

1. Open Chrome and navigate to chrome://inspect.
2. Click "Open dedicated DevTools for Node".
3. Select the "Performance" tab.
4. Click "Load profile" and import your .cpuprofile file.

License

MIT