TSCover - code coverage for TypeScript

TSCover is a Typescript compiler that produces instrumented javascript used to collect code coverage information. Code coverage is saved in the form of LCOV files, JSON files or as an HTML report.

Features

• Works as a drop-in replacement for tsc. All tsc options work as expected.
• Instruments .ts files during compilation. Does not require .map files.
• Reports coverage as lcov.info, json files or as an html report.
• Supports statement, branch and file coverage.

Usage

TSCover requires typescript library so first step is to make sure that typescript is installed globally. After that install tscover as the global library:

npm install -g typescript
npm install -g tscover

You can run tscover the same way that you would run tsc, all tsc options will work as expected. Or you can use tsconfig.json to specify compiler options:

tscover program.ts
tscover -p project/tsconfig.json

Run the program as you normally would and upon exit it will produce a coverage folder with lcov, json and html files in it.

Instrumented files

Normally tscover produces compiled javascript files only. However if you would like to see instrumented typescript files too pass --tscover-instrument flag:

tscover --tscover-instrument -p project/tsconfig.json

This will instruct the compiler to produce .ts.cover files that can be used for troubleshooting.