Coverage for semaphore/index.ts shows errors

[ComFreek]

Coverage for semaphore/index.ts shows error information, which also seems to decrease coverage percentage for no reason.

How to reproduce

1. async-playground at commit fa32e5e.

2. Optional: produce coverage info

3. Go to coverage/semaphore/index.ts.html. Live: https://comfreek.github.io/async-playground/coverage/semaphore/index.ts.html

4. The following error message is shown there:

   Cannot read property 'start' of undefined
   TypeError: Cannot read property 'start' of undefined
       at /home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:50:29
       at Array.forEach ()
       at annotateStatements (/home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:46:33)
       at Object.annotateSourceCode (/home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:190:9)
       at HtmlReport.onDetail (/home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-reports/lib/html/index.js:237:39)
       at Visitor.(anonymous function) [as onDetail] (/home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:34:30)
       at ReportNode.Node.visit (/home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:123:17)
       at /home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:116:23
       at Array.forEach ()
       at visitChildren (/home/travis/build/ComFreek/async-playground/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:115:32)
   

Related bug reports

• Typescript reports with error: property 'start' of undefined istanbuljs/nyc#733
• Cannot read property 'start' of undefined istanbuljs/nyc#239
• Issues with meta.loc.start.line when running lcov reports istanbuljs/nyc#677
• [7.0.0] Cannot read property 'start' of undefined istanbuljs/nyc#306
• Error when trying to generate html reports. gotwarlost/istanbul#702

Summary:

• Sometimes due to old Babel plugins being used. We don't use Babel here. (We only use TypeScript.)
• Sometimes non-deterministic due to cached data. This is reproducible on Travis CI, which should not cache any data.
• Sometimes unsolved.

[ComFreek]

This seems to be magically resolved with Greenkeeper's PR #8.