To obtain coverage reports for code running in web browsers, you can configure code coverage with TypeScript and Karma.
This tutorial teaches you how to include all source files for code coverage reporting in an Electron app. It covers steps such as using `babel` with `electron-mocha`, registering plugins in `babel` to instrument code, and running `nyc` to create a coverage report. The article also provides code snippets and configuration files to help you implement these steps.
In TypeScript, you can define custom properties on the `window` namespace by declaring them as global properties. For example, if you want to make TypeScript aware of the property `window.__coverage__`, you can declare it in your code using the `declare global` syntax.