@tracecov/jest

Multi-file OpenAPI coverage reporting for Jest.

Jest runs each test file in its own worker, so a single coverage map never sees every file's requests. This package collects each worker's fetch interactions and merges them into one report at the end of the run. Self-contained CommonJS — no --experimental-vm-modules, works on Jest 29 and 30.

Installation

npm install -D @tracecov/jest

Quick Start

// jest.config.js
module.exports = {
  setupFilesAfterEnv: ['./tracecov.setup.js'],
  reporters: [
    'default',
    ['@tracecov/jest/reporter', { schema: 'openapi.json', report: { html: 'coverage.html' } }],
  ],
};

// tracecov.setup.js
const { collectCoverage, instrumentFetch } = require('@tracecov/jest');

instrumentFetch(collectCoverage());

Every fetch your tests make is recorded, merged across workers, and written to the configured report(s) when the run ends. A thresholds breach sets a non-zero exit code.

Documentation

• Integration guide
• API reference