Code coverage with Istanbul

[blakeembrey]

I spent a long time trying to resolve this already, but can't find a decent solution. I started based on https://github.com/babel/babel/blob/master/packages/babel/src/api/register/node.js with process.env.running_under_istanbul and got it executing but got stuck with no coverage information coming out.

[blakeembrey]

Istanbul 1.0 alpha.

[silviogutierrez]

So I'm trying the alpha as you suggested, but I still get no info coming out. Here's the command:

./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha -- --compilers ts:ts-node/register client/test.ts

Test passes fine, but it prints:

No coverage information was collected, exit without writing coverage information at the bottom.

Am I missing something? I'm on istanbul 1.0 alpha 2.

Thanks,

Silvio

[silviogutierrez]

Think I solved it! For the curious, you need an .istanbul.yml file. Mine is currently:

instrumentation:
  extensions:
    - .tsx
    - .ts

And it seemed to work.

[sinedied]

I still can't make it work with istanbul@1.1.0-alpha.1 and jasmine: sourcemaps are broken for the jasmine reporters and something crash after the test executions :(

Without istanbul the tests run fin with jasmine.

[jonaskello]

I found this comment very helpful. Basically use nyc command to run instanbul instead of the istanbul command and it works.

[sinedied]

@jonaskello that's what I end up using, nyc works fine with ts-node without any pain.