Rerun Test Coverage Multiple Times Produce Different Coverage Results

Link to bug demonstration repository

I’ve followed this link in nyc npm, since we use typescript

Run tests multiple times with test coverage enabled results in different results-

Expected Behavior

Observed Behavior

Half times is 85%

Half times is 68%

Interesting fact When the percentage is higher, which is correct, I could see each code file coverage But when the percentage is lower, which is incorrect, when I click each code file, some files instead of showing the code and coverage for each line, shows below message

Troubleshooting steps

• still occurring when I put cache: false in my nyc config This does nothing for me

Environment Information

# paste the output here

System:
    OS: macOS 10.14.4
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 567.67 MB / 16.00 GB
  Binaries:
    Node: 12.3.1 - /usr/local/bin/node
    Yarn: 1.16.0 - /usr/local/bin/yarn
    npm: 6.9.0 - /usr/local/bin/npm
  npmPackages:
    nyc: ^14.1.1 => 14.1.1 
    source-map-support: ^0.5.12 => 0.5.12 
    ts-node: ^8.1.0 => 8.2.0 
    typescript: ^3.1.1 => 3.5.1 

[godu]

I may have a solution :

• .nycrc

{
	...
	"require": ["ts-node/register"]
}

[corradopetrelliunicam]

@godu thank you so much! It works