istanbuljs/nyc

Coverage fails when run with OxProject

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#1035 opened on Mar 19, 2019

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Description

Hello everybody, When generating an html coverage report with nyc report --reporter=html I am getting the html files in a folder, but trying to open a specific file, the following error is occured:

Cannot read property 'start' of undefined
TypeError: Cannot read property 'start' of undefined
    at /Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:92:34
    at Array.forEach ()
    at annotateFunctions (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:88:26)
    at Object.annotateSourceCode (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-reports/lib/html/annotator.js:239:9)
    at HtmlReport.onDetail (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-reports/lib/html/index.js:269:23)
    at Visitor.(anonymous function) [as onDetail] (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:34:30)
    at ReportNode.Node.visit (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:121:17)
    at /Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:114:23
    at Array.forEach ()
    at visitChildren (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:113:32)
    at ReportNode.Node.visit (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:124:5)
    at Tree.visit (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/node_modules/istanbul-lib-report/lib/tree.js:155:20)
    at reporter.forEach (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/index.js:454:10)
    at Array.forEach ()
    at NYC.report (/Users/ognyanchikov/Etherlime/etherlime/node_modules/nyc/index.js:453:17)
    at showCoverageResults (/Users/ognyanchikov/Etherlime/etherlime/cli-commands/etherlime-test/etherlime-coverage.js:206:13)
    at Timeout.setTimeout (/Users/ognyanchikov/Etherlime/etherlime/cli-commands/etherlime-test/etherlime-coverage.js:73:9)
    at ontimeout (timers.js:482:11)
    at tryOnTimeout (timers.js:317:5)
    at Timer.listOnTimeout (timers.js:277:5

The text table report works and shows results, but the HTML is broken.

Contributor guide

Tech stack
javascriptnodejs
Domain
clitesting
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Node.jsJavaScriptnyc basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
The error occurs in annotator.js at line 92 in annotateFunctions where 'start' is undefined. Investigate why the function metadata lacks this property. Check the data flow from nyc to istanbul reports, focusing on how coverage maps are built. Review issue comments for proposed fixes or additional context. Consider adding a null check or ensuring the function object is complete before annotation.