Aggregating Unit Test Coverage for All Monorepo’s Packages

• pedalboard

  23 18 7.8 TypeScript

  A collection of packages to make you software sound better (by mbarzeev)

In this post join me as I will be adding an aggregated unit test code coverage report for my Pedalboard monorepo. Monorepos contain many packages, and for each you (should) have tests for and a way to generate a code coverage report from them, but what if you’d like to have a single place where you can see the overall coverage status of the entire monorepo? Let me show you how…

• lerna

  162 35,328 9.1 TypeScript

  :dragon: Lerna is a fast, modern build system for managing and publishing multiple JavaScript/TypeScript packages from the same repository.

  

It is a good time to mention that my Pedalboard monorepo uses the Jest testing framework. The first step is to add a script at the root project level, with which I can run my test coverage for all the nested packages. Should be straightforward, using Lerna for that. Here is how my scripts look like now:

• SurveyJS

  surveyjs.io sponsored

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• nyc

  16 5,520 4.7 JavaScript

  the Istanbul command line interface

  

So let’s see if nyc (the code coverage generator) can help with that. Hmm… this documentation seems interesting! So basically what I understand from it is that I need to collect all the reports from the different packages and then run the nyc report over it. The flow should be like this:

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