Mocha + TypeScript + Istanbul = No coverage information was collected, exit without writing coverage information

[thitemple]

I'm trying to get code coverage on my TypeScript code. The tests are written using mocha
I'm compiling the code to a directory using

tsc --outDir test

For those not used to TypeScript this is the same as doing this with babel:

babel src --out-dir lib

The the code is compiled and source map files are generated.

After that, I try to run istanbul with the command:

node_modules/.bin/istanbul cover node_modules/mocha/bin/_mocha test/**/*.spec.js

All the tests are passing, but the result is always:

No coverage information was collected, exit without writing coverage information

Is there something special I should do after compiling the TS code? Thanks.

PS: I tried versions 0.4.2 and 1.0.0-alpha.2

[xogeny]

Same question... 😢

[xogeny]

I eventually got this working. You can see my salvage repository to see what I had to do. Specifically, look in package.json for the cover script definition.

[awwong1]

Hello! Has any progress been made on this since the issue opened on May 2nd 2016?

[iconnor]

I also have the same issue here in a learning/play app we are working on https://github.com/jacepatel/typescript-express-api maybe having an easy example will help narrow down the issue?