| 1 | import libCoverage from "istanbul-lib-coverage";
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| 2 |
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| 3 | export function mergeCovMaps(covMaps: ReadonlyArray<libCoverage.CoverageMapData>): libCoverage.CoverageMapData {
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| 4 | const merged: libCoverage.CoverageMapData = Object.create(null);
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| 5 | for (const covMap of covMaps) {
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| 6 | for (const fileCov of Object.values(covMap)) {
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| 7 | if (Reflect.get(merged, fileCov.path) !== undefined) {
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| 8 | throw new Error(`DuplicateFileCoverage: ${fileCov.path}`);
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| 9 | }
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| 10 | Reflect.set(merged, fileCov.path, fileCov);
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| 11 | }
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| 12 | }
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| 13 | return merged;
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| 14 | }
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