Getting Started

diff-cover-ts provides two command line tools:

• diff-cover checks coverage on changed lines.
• diff-quality checks static analysis violations on changed lines.

Install

npm install --save-dev diff-cover

or with Bun:

bun add -d diff-cover

Coverage Gate

Generate a coverage report with your test runner, then run:

diff-cover coverage/lcov.info --compare-branch origin/main --fail-under 90

For Vite or Vitest projects, diff-cover can detect common coverage reports from vite.config.* or vitest.config.*:

diff-cover

Quality Gate

Run your linter or analyzer first, then pass its report to diff-quality:

diff-quality eslint-report.json --violations eslint --fail-under 95

Reports

Generate HTML and JSON coverage reports:

diff-cover coverage/lcov.info --format html:coverage.html,json:coverage.json

Generate an HTML quality report:

diff-quality eslint-report.json --violations eslint --html-report quality.html