istanbul-lib-coverage
Advanced tools
An API that provides a read-only view of coverage information with the ability to merge and summarize coverage info.
Supersedes object-utils and collector from the v0 istanbul API.
See the docs for the full API.
var libCoverage = require('istanbul-lib-coverage');
var map = libCoverage.createCoverageMap(globalCoverageVar);
var summary = libCoverage.createCoverageSummary();
// merge another coverage map into the one we created
map.merge(otherCoverageMap);
// inspect and summarize all file coverage objects in the map
map.files().forEach(function(f) {
var fc = map.fileCoverageFor(f),
s = fc.toSummary();
summary.merge(s);
});
console.log('Global summary', summary);
nyc is a command-line-interface tool that wraps istanbul-lib-coverage and other Istanbul libraries to provide a simplified user experience for instrumenting code, running tests, and generating coverage reports. It's more of a complete toolset compared to the lower-level API functionality provided by istanbul-lib-coverage.
c8 leverages the built-in V8 coverage tool to collect test coverage. Unlike istanbul-lib-coverage, which instruments the source code to track coverage, c8 works at the V8 engine level, providing potentially more accurate coverage metrics without the need to modify the source code. This difference in approach makes c8 a compelling alternative for projects that can benefit from native coverage collection.
Jest is a popular testing framework that includes built-in coverage reporting capabilities. While istanbul-lib-coverage is focused solely on coverage collection and reporting, Jest provides a comprehensive testing solution that includes assertions, mocks, and coverage. Jest uses Istanbul under the hood for coverage reporting, making it a higher-level alternative that integrates testing and coverage.
FAQs
Data library for istanbul coverage objects
The npm package istanbul-lib-coverage receives a total of 38,562,473 weekly downloads. As such, istanbul-lib-coverage popularity was classified as popular.
We found that istanbul-lib-coverage demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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