Typescript reports with error: property 'start' of undefined

[ozum]

Expected Behavior

Same report during repeated execution.

Observed Behavior

I have a code with 100% coverage. Using typescript and without changing any file, when I execute nyc repeatedly, I get different coverage reports.

(See repo below) I executed npm run test:cover 6-7 times repeatedly and once every few I got reports below 100%. Reports below 100% has following error in HTML reports:

Cannot read property 'start' of undefined
TypeError: Cannot read property 'start' of undefined
    at ...node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:50:29
    at Array.forEach ()
    at annotateStatements (...node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:46:33)
    at Object.annotateSourceCode (...node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:190:9)
    at HtmlReport.onDetail (...node_modules/nyc/node_modules/istanbul-reports/lib/html/index.js:217:39)
    at Visitor.(anonymous function) [as onDetail] (...node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:34:30)
    at ReportNode.Node.visit (...node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:123:17)
    at ...node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:116:23
    at Array.forEach ()
    at visitChildren (...node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:115:32)

Bonus Points! Code (or Repository) that Reproduces Issue

https://github.com/ozum/fix-set/tree/typescript-try

Forensic Information

Operating System: MacOS 10.12.6
Environment Information:

node v9.2.0
npm v5.5.1
nyc v11.3.0 or nyc v11.4.0 (Repo has v11.4.0 in package.json)

[bcoe]

@ozum are you still running into this issue? I haven't been able to reproduce so far running npm run test:cover.

[ozum]

@bcoe, I was away from that code for a while. Currently, I also cannot reproduce. I'm closing this issue. I will open another ticket, if it happens again.

Thanks,

[bcoe]

@ozum great, might have been something that was fixed upstream 👍

[ZehuaZhang]

I've encountered the same problem, I don't think it's a good practice just to close the bug rather than fixing it?

[alihassan0]

I have encountered the same problem as well. nyc keeps giving different results everytime I run it (alternating between 100% coverage & 50% coverage) and I am faced with the same error when it fails. (However I don't use typescript)

[coreyfarrell]

No action will be taken without a reproduction against latest nyc. If you are experiencing an issue please post a new issue and include all required information.

[ZehuaZhang]

@coreyfarrell Thanks for the reply, I've created a ticket for it #1124