[coverage] ES6 import and Flow pragma have issues with coverage

[migueloller]

Using jest@18.0.0 with babel-jest@18.0.0.

Here is my .babelrc:

{
  "presets": [
    ["env", {
      "targets": {
        "node": 7.2
      },
      "whitelist": [
        "transform-class-properties",
        "transform-object-rest-spread",
        "transform-flow-strip-types"
      ]
    }]
  ]
}

Here is another screenshot but separating import and export into different lines:

Any ideas what might be going on?

[thymikee]

We use istanbul to generate the coverage, so maybe it's better to file an issue there?

[thymikee]

cc: @DmitriiAbramov

[aaronabramov]

unfortunately we instrument already transpiled code, so there can be a lot of invisible things that mess up the coverage report like that.
i really hope this #2290 will solve this isuue

[migueloller]

@DmitriiAbramov, would it help if I ran the tests on the transpiled code and posted a screenshot of that instead?

[aaronabramov]

@migueloller i have an idea of what the resulting code looks like and there's nothing we can really do now.
good thing is that it usually only messes up the top of the file (imports) and they are not that important.
Does it provide a readable coverage report for the rest of the file for you?

[migueloller]

@DmitriiAbramov,

I haven't had any other coverage issues with other files. 😄

The screenshot I posted is a single file, it's just exporting some utilities as named exports for easier access.

EDIT: For now I'm just ignoring that file specifically when generating coverage reports.

[aaronabramov]

@migueloller let's wait for #2290 and see if it fixes it :)

[migueloller]

@DmitriiAbramov, sounds good!

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