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# istanbul-lib-report
[](https://greenkeeper.io/)
[](https://travis-ci.org/istanbuljs/istanbul-lib-report)
Core reporting utilities for istanbul.
## Example usage
```js
const libReport = require('istanbul-lib-report');
const reports = require('istanbul-reports');
// coverageMap, for instance, obtained from istanbul-lib-coverage
const coverageMap;
const configWatermarks = {
statements: [50, 80],
functions: [50, 80],
branches: [50, 80],
lines: [50, 80]
};
// create a context for report generation
const context = libReport.createContext({
dir: 'report/output/dir',
// The summarizer to default to (may be overridden by some reports)
// values can be nested/flat/pkg. Defaults to 'pkg'
defaultSummarizer: 'nested',
watermarks: configWatermarks,
coverageMap,
})
// create an instance of the relevant report class, passing the
// report name e.g. json/html/html-spa/text
const report = reports.create('json', {
skipEmpty: configSkipEmpty,
skipFull: configSkipFull
})
// call execute to synchronously create and write the report to disk
report.execute(context)
```
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