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91 lines
2.3 KiB
91 lines
2.3 KiB
2 years ago
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# v8-to-istanbul
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[](https://travis-ci.org/istanbuljs/v8-to-istanbul)
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[](https://conventionalcommits.org)
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converts from v8 coverage format to [istanbul's coverage format](https://github.com/gotwarlost/istanbul/blob/master/coverage.json.md).
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## Usage
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```js
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const v8toIstanbul = require('v8-to-istanbul')
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// the path to the original source-file is required, as its contents are
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// used during the conversion algorithm.
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const converter = v8toIstanbul('./path-to-instrumented-file.js')
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await converter.load() // this is required due to the async source-map dependency.
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// provide an array of coverage information in v8 format.
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converter.applyCoverage([
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{
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"functionName": "",
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"ranges": [
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{
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"startOffset": 0,
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"endOffset": 520,
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"count": 1
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}
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],
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"isBlockCoverage": true
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},
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// ...
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])
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// output coverage information in a form that can
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// be consumed by Istanbul.
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console.info(JSON.stringify(converter.toIstanbul()))
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// cleanup resources allocated in "load" (i.e. by the source-map dependency),
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// the converter may not be used anymore afterwards
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converter.destroy()
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```
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## Ignoring Uncovered Lines
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Sometimes you might find yourself wanting to ignore uncovered lines
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in your application (for example, perhaps you run your tests in Linux, but
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there's code that only executes on Windows).
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To ignore lines, use the special comment `/* c8 ignore next */`.
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### ignoring the next line
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```js
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const myVariable = 99
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/* c8 ignore next */
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if (process.platform === 'win32') console.info('hello world')
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```
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### ignoring the next N lines
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```js
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const myVariable = 99
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/* c8 ignore next 3 */
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if (process.platform === 'win32') {
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console.info('hello world')
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}
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```
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### ignoring all lines until told
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```js
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/* c8 ignore start */
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function dontMindMe() {
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// ...
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}
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/* c8 ignore stop */
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```
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### ignoring the same line as the comment
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```js
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const myVariable = 99
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const os = process.platform === 'darwin' ? 'OSXy' /* c8 ignore next */ : 'Windowsy'
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```
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## Testing
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To execute tests, simply run:
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```bash
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npm test
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```
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