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| 1 | ## istanbul-lib-coverage
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| 2 |
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| 3 | [](https://greenkeeper.io/)
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| 4 | [](https://travis-ci.org/istanbuljs/istanbul-lib-coverage)
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| 5 |
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| 6 | An API that provides a read-only view of coverage information with the ability
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| 7 | to merge and summarize coverage info.
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| 8 |
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| 9 | Supersedes `object-utils` and `collector` from the v0 istanbul API.
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| 10 |
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| 11 | See the docs for the full API.
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| 12 |
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| 13 | ```js
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| 14 | var libCoverage = require('istanbul-lib-coverage');
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| 15 | var map = libCoverage.createCoverageMap(globalCoverageVar);
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| 16 | var summary = libCoverage.createCoverageSummary();
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| 17 |
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| 18 | // merge another coverage map into the one we created
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| 19 | map.merge(otherCoverageMap);
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| 20 |
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| 21 | // inspect and summarize all file coverage objects in the map
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| 22 | map.files().forEach(function(f) {
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| 23 | var fc = map.fileCoverageFor(f),
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| 24 | s = fc.toSummary();
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| 25 | summary.merge(s);
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| 26 | });
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| 27 |
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| 28 | console.log('Global summary', summary);
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| 29 | ```
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