istanbul-api

Creating Coverage Reports

This feature allows you to create coverage reports in various formats such as HTML. The code sample demonstrates how to create an HTML coverage report using the 'istanbul-api' package.

const istanbul = require('istanbul-api');
const reports = istanbul.reports;
const collector = new istanbul.Collector();
const reporter = reports.create('html', { dir: './coverage' });

collector.add(global.__coverage__);
reporter.writeReport(collector, true);

Managing Coverage Data

This feature allows you to manage and manipulate coverage data. The code sample shows how to create a coverage map and add file coverage data to it.

const istanbul = require('istanbul-api');
const coverageMap = istanbul.libCoverage.createCoverageMap();

coverageMap.addFileCoverage(global.__coverage__);
console.log(coverageMap.toJSON());

Instrumenting Code for Coverage

This feature allows you to instrument code for coverage analysis. The code sample demonstrates how to read a JavaScript file, instrument it for coverage, and write the instrumented code to a new file.

const istanbul = require('istanbul-api');
const instrumenter = istanbul.libInstrument.createInstrumenter();
const fs = require('fs');

const code = fs.readFileSync('path/to/your/file.js', 'utf8');
const instrumentedCode = instrumenter.instrumentSync(code, 'path/to/your/file.js');

fs.writeFileSync('path/to/your/instrumented-file.js', instrumentedCode);