nyc

What it is

nyc is a code coverage tool that works with subprocesses and is built on top of Istanbul. It helps developers measure the effectiveness of their test suites by identifying which parts of the code are being tested and which are not.

nyc stands out as an open-source tool specifically designed to work seamlessly with subprocesses, offering detailed and accurate code coverage reports for JavaScript and TypeScript projects.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Steep learning curve for new users

   nyc's configuration options and integration with test runners can be complex, requiring significant time to fully understand.

2. 02

   Limited documentation on advanced usage

   The official documentation focuses mainly on basic setup and usage but lacks detailed examples for more complex scenarios such as custom reporters or integrations with CI/CD pipelines.

3. 03

   Performance overhead during testing

   nyc can introduce significant performance overhead, especially in large projects, which may slow down the test suite execution time.

4. 04

   Issues with subprocesses and coverage reporting

   Subprocess code coverage might not be accurately reported due to limitations in how nyc handles child processes and external modules.

What it does well

• Works with subprocesses to measure code coverage.

• Built on top of Istanbul for robust coverage analysis.

• Supports both JavaScript and TypeScript.

Pricing

Free tier

YesOpen source — free to use

Paid from

$0

Model

Flat rate

Enterprise plan

No

Pricing not independently confirmed — check the vendor’s page.