I have a JavaScript file that generates a code-coverage report via karma-coverage. Karma-coverage generates reports via Istanbul from my understanding. At this time, istanbul generates two files of interest: an html report, and a .json file.
The HTML report has percentages around statement coverage, branch coverage, function coverage, and line coverage. A sample of the HTML report can be seen here: http://gotwarlost.github.io/istanbul/public/coverage/lcov-report/index.html
The .json file gets generated in a file called coverage.json. A sample of the coverage.json file can bee seen here: http://gotwarlost.github.io/istanbul/public/coverage/coverage.json.
For the life of me, I can't figure how the HTML report gets the statement, coverage, branch and function coverage percentages from the .json file. However, I to get the statement, coverage, branch, and function coverage percentages from the .json file.
Am I misunderstanding what the .json file is? Isn't there just a summarization in the .json file?