support for per-each file coverage check

[ciekawy]

Please use the template provided below, when reporting bugs:

Expected Behavior

support to provide and require thresholds per-each file like in
gotwarlost/istanbul#30

Observed Behavior

not possible to define per-each file coverage checks

Bonus Points! Code (or Repository) that Reproduces Issue

Forensic Information

I believe this is just not supported yet so skipping following sections, can add this info anytime

Operating System: the operating system you observed the issue on.
Environment Information: information about your project's environment, see instructions below:

1. run the following script:

sh -c 'node --version; npm --version; npm ls' > output.txt

2. share a gist with the contents of output.txt.

[ciekawy]

seems like this can be relatively simple to implement by enhancing NYC::checkCoverage

nyc/index.js

Line 444 in 213206f

NYC.prototype.checkCoverage = function (thresholds) {

[JaKXz]

I think this is addressed in #591. Feel free to test it out by installing:

npm cache clear; npm install 1and1/nyc#coverage_per_file

[ciekawy]

Looks like exactly what I was looking for. Thanks @JaKXz for pointing this out!

[bcoe]

@ciekawy this feature is now landed 👍

[mkonikov]

Is there a way to do it both per file and globally like it was done previously in Istanbul?
https://github.com/gotwarlost/istanbul/blob/master/test/cli/sample-project/config-check-mixed.istanbul.yml

Can this be set in an .nycrc file?

[mkonikov]

I see this was outlined here - #468 - but doesn't seem possible yet.