How can I check the coverage of my npm package?

How can I check the coverage of my npm package?

You can use tools like Istanbul or Jest to check the coverage of your npm package. Would you like to know how to set them up?

Yes, please explain how to set up Jest for coverage.

To set up Jest for coverage, first install it using npm: npm install --save-dev jest. Then, add a script in your package.json: "test": "jest --coverage". This will generate a coverage report when you run your tests.

What kind of output can I expect from the coverage report?

The coverage report will show you the percentage of code covered by tests, including details on which lines, functions, and branches are covered or missed.