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v8-to-istanbul
Advanced tools
The v8-to-istanbul package is a tool that converts V8 coverage information into a format that is compatible with Istanbul's coverage reports. It allows developers to generate coverage reports for JavaScript code executed in the V8 JavaScript engine, which is used by Node.js and Chrome.
Convert V8 coverage to Istanbul format
This feature allows you to convert V8 coverage information into the Istanbul format. You can then use this data to generate reports with Istanbul-compatible tools.
const v8toIstanbul = require('v8-to-istanbul');
const scriptPath = './path/to/script.js';
const v8Coverage = require('./path/to/v8-coverage.json');
const converter = v8toIstanbul(scriptPath);
converter.load();
converter.applyCoverage(v8Coverage);
const istanbulCoverage = converter.toIstanbul();
console.log(JSON.stringify(istanbulCoverage, null, 2));
Exclude specific functions or lines from coverage
This feature allows you to exclude specific functions or ranges of lines from the coverage report. This is useful for ignoring code that you do not want to include in your coverage metrics.
const v8toIstanbul = require('v8-to-istanbul');
const scriptPath = './path/to/script.js';
const converter = v8toIstanbul(scriptPath, {
exclude: ['**/node_modules/**', '**/test/**']
});
converter.exclude('functionName');
converter.excludeRange([startLine, endLine]);
nyc is a command-line tool and library for instrumenting code with Istanbul's coverage tracking and reporting. It is a more comprehensive tool that includes v8-to-istanbul's functionality as part of its coverage processing pipeline.
c8 is a higher-level tool that uses v8-to-istanbul under the hood to collect and report V8 code coverage. It provides a simple command-line interface to generate coverage reports without needing to manually convert V8 coverage data.
istanbul-lib-instrument is part of the Istanbul API and is responsible for instrumenting JavaScript code. It differs from v8-to-istanbul in that it modifies the code to track coverage, rather than converting coverage data from the V8 engine.
converts from v8 coverage format to istanbul's coverage format.
const v8toIstanbul = require('v8-to-istanbul')
// create a script object from a source-file. the source file
// is loaded from disk and this is used to determine the original
// line count.
const script = v8toIstanbul('./path-to-instrumented-file.js')
// provide an array of coverage information in v8 format.
script.applyCoverage([
{
"functionName": "",
"ranges": [
{
"startOffset": 0,
"endOffset": 520,
"count": 1
}
],
"isBlockCoverage": true
},
// ...
])
// output coverage information in a form that can
// be consumed by Istanbul.
console.info(JSON.stringify(script.toIstanbul()))
To execute tests, simply run:
npm test
2.0.3 (2019-04-07)
<a name="2.0.2"></a>
FAQs
convert from v8 coverage format to istanbul's format
The npm package v8-to-istanbul receives a total of 14,731,779 weekly downloads. As such, v8-to-istanbul popularity was classified as popular.
We found that v8-to-istanbul demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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