Code coverage reports show coverage of transpiled code as opposed to the original ES6 code

[catamphetamine]

I use it like this:

  "scripts": {
    "test": "mocha --compilers js:babel/register-without-polyfill --colors --bail --reporter spec test/",
    "test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --compilers js:babel/register-without-polyfill --colors --reporter dot test/",
    "test-travis": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --compilers js:babel/register-without-polyfill --colors --reporter spec test/",

And when I look at the code coverage reports they show coverage for the transpiled code. How can I generate coverage for the original ES6 code? I guess Babel should output some source maps. Or does istanbul support ES6 natively? (and what's the command)

[iamstarkov]

faced the same issue

[sivakumar-kailasam]

Was facing the same issue and came across isparta. After a bit of meddling around I made it work for my repo https://github.com/sivakumar-kailasam/broccoli-leasot/commit/ff5f848b4104b131fcb47fc494d6455cf32182c4 . You can see it working at https://codeclimate.com/github/sivakumar-kailasam/broccoli-leasot/coverage/55b70ac20d7e0c07370386ad

[justindalton]

@sivakumar-kailasam I was able to get it working with isparta as well. The only problem I still have with it is that it won't cover .jsx files which istanbul is able to do.

[madbence]

@justincdalton My setup:

• test files are test/**/*.es6
• source files are src/**/*.es6
• dist files are dist/**/*.js

Relevant package.json entry:

{
  "cover": "babel-node node_modules/.bin/isparta cover --include '**/*.es6' node_modules/.bin/_mocha -- 'test/**/*.es6' --reporter dot"
}

Relevant .istanbul.yml entry:

instrumentation:
  root: src
  extensions:
    - .es6

I guess you can replace es6 with jsx and it Just Works™.