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Fix concurrent access to result map when merging coverage #1425

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Fix concurrent access to result map when merging coverage #1425

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14 changes: 8 additions & 6 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -418,17 +418,19 @@ class NYC {
}

async getCoverageMapFromAllCoverageFiles (baseDirectory) {
const map = libCoverage.createCoverageMap({})
const files = await this.coverageFiles(baseDirectory)

await pMap(
const reports = await pMap(
files,
async f => {
const report = await this.coverageFileLoad(f, baseDirectory)
map.merge(report)
},
f => this.coverageFileLoad(f, baseDirectory),
{ concurrency: os.cpus().length }
)
const map = reports.reduce((m, report) => {
m.merge(report)
return m
},
libCoverage.createCoverageMap({})
)

map.data = await this.sourceMaps.remapCoverage(map.data)

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