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feat: support monocart report #521

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Jun 11, 2024
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12 changes: 12 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ Here is a list of common options. Run `c8 --help` for the full list and document
| `--per-file` | check thresholds per file | `boolean` | `false` |
| `--temp-directory` | directory V8 coverage data is written to and read from | `string` | `process.env.NODE_V8_COVERAGE` |
| `--clean` | should temp files be deleted before script execution | `boolean` | `true` |
| `--experimental-monocart` | see [section below](#using-monocart-coverage-reports-experimental) for more info | `boolean` | `false` |

## Checking for "full" source coverage using `--all`

Expand Down Expand Up @@ -119,6 +120,17 @@ The `--100` flag can be set for the `check-coverage` as well:
c8 check-coverage --100
```

## Using Monocart coverage reports (experimental)
Monocart will bring additional support for native V8 coverage reports, for example:
```sh
c8 --experimental-monocart --reporter=v8 --reporter=console-details node foo.js
```
There are some differences as follows:
- `c8` uses `v8-to-istanbul` by default to convert V8 coverage data and generate Istanbul reports.
- `c8 --experimental-monocart` will use Monocart's new converter to convert V8 coverage data and generate Istanbul reports, it could provide better data for reports. Moreover, it can also directly generate V8 coverage reports (based on Bytes), such as available reports: `v8`, `console-details`, etc.

See [monocart-coverage-reports](https://github.com/cenfun/monocart-coverage-reports) for more info.
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## Ignoring Uncovered Lines, Functions, and Blocks

Sometimes you might find yourself wanting to ignore uncovered portions of your
Expand Down
3 changes: 2 additions & 1 deletion lib/commands/report.js
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,8 @@ exports.outputReport = async function (argv) {
src: argv.src,
skipFull: argv.skipFull,
excludeNodeModules: argv.excludeNodeModules,
mergeAsync: argv.mergeAsync
mergeAsync: argv.mergeAsync,
monocartArgv: (argv.experimentalMonocart || process.env.EXPERIMENTAL_MONOCART) ? argv : null
})
await report.run()
if (argv.checkCoverage) await checkCoverages(argv, report)
Expand Down
5 changes: 5 additions & 0 deletions lib/parse-args.js
Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,11 @@ function buildYargs (withCommands = false) {
describe: 'supplying --merge-async will merge all v8 coverage reports asynchronously and incrementally. ' +
'This is to avoid OOM issues with Node.js runtime.'
})
.option('experimental-monocart', {
default: false,
type: 'boolean',
describe: 'Using Monocart coverage reports'
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})
.pkgConf('c8')
.demandCommand(1)
.check((argv) => {
Expand Down
130 changes: 129 additions & 1 deletion lib/report.js
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ const getSourceMapFromFile = require('./source-map-from-file')
const v8toIstanbul = require('v8-to-istanbul')
const util = require('util')
const debuglog = util.debuglog('c8')
const { CoverageReport } = require('monocart-coverage-reports')
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we should move this into a try/catch.

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Perhaps we should move if into a try/catch in a separate monocart.js helper file, then we can mock that file to test the help output.


class Report {
constructor ({
Expand All @@ -36,7 +37,8 @@ class Report {
allowExternal = false,
skipFull,
excludeNodeModules,
mergeAsync
mergeAsync,
monocartArgv
}) {
this.reporter = reporter
this.reporterOptions = reporterOptions || {}
Expand All @@ -60,6 +62,7 @@ class Report {
this.src = this._getSrc(src)
this.skipFull = skipFull
this.mergeAsync = mergeAsync
this.monocartArgv = monocartArgv
}

_getSrc (src) {
Expand All @@ -73,6 +76,9 @@ class Report {
}

async run () {
if (this.monocartArgv) {
return this.runMonocart()
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If we were unable to require Monocart, we should print the install instructions here and exit with 1.

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I have made the following improvements based on your suggestion

  • Move the import library to try/catch. see function getMonocart ()
  • Use the import("xxx") function to load the lib asynchronously. It should be good enough without creating a new help file, and added new test case to cover it (rename the lib entry file can mock it).
  • Print the install instructions and exit with 1 when failed to load the lib.

Please review, thanks.

}
const context = libReport.createContext({
dir: this.reportsDirectory,
watermarks: this.watermarks,
Expand All @@ -89,6 +95,128 @@ class Report {
}
}

async runMonocart () {
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👍 I prefer now that we're sharing some of the same behaviour in report.js.

const argv = this.monocartArgv
const exclude = this.exclude

function getEntryFilter () {
if (argv.entryFilter) {
return argv.entryFilter
}
if (argv.filter) {
return argv.filter
}
return (entry) => {
return exclude.shouldInstrument(fileURLToPath(entry.url))
}
}

function getSourceFilter () {
if (argv.sourceFilter) {
return argv.sourceFilter
}
if (argv.filter) {
return argv.filter
}
return (sourcePath) => {
if (argv.excludeAfterRemap) {
// console.log(sourcePath)
return exclude.shouldInstrument(sourcePath)
}
return true
}
}

function getReports () {
const reports = Array.isArray(argv.reporter) ? argv.reporter : [argv.reporter]
const reporterOptions = argv.reporterOptions || {}

return reports.map((reportName) => {
const reportOptions = {
...reporterOptions[reportName]
}
if (reportName === 'text') {
reportOptions.skipEmpty = false
reportOptions.skipFull = argv.skipFull
reportOptions.maxCols = process.stdout.columns || 100
}
return [reportName, reportOptions]
})
}

// --all: add empty coverage for all files
function getAllOptions () {
if (!argv.all) {
return
}

const src = argv.src
const workingDirs = Array.isArray(src) ? src : (typeof src === 'string' ? [src] : [process.cwd()])
return {
dir: workingDirs,
filter: (filePath) => {
return exclude.shouldInstrument(filePath)
}
}
}

function initPct (summary) {
Object.keys(summary).forEach(k => {
if (summary[k].pct === '') {
summary[k].pct = 100
}
})
return summary
}

// adapt coverage options
const coverageOptions = {
logging: argv.logging,
name: argv.name,
inline: argv.inline,
lcov: argv.lcov,
outputDir: argv.reportsDir,
clean: argv.clean,

reports: getReports(),
all: getAllOptions(),

// use default value for istanbul
defaultSummarizer: 'pkg',

entryFilter: getEntryFilter(),
sourceFilter: getSourceFilter(),

onEnd: (coverageResults) => {
// for check coverage
this._allCoverageFiles = {
files: () => {
return coverageResults.files.map(it => it.sourcePath)
},
fileCoverageFor: (file) => {
const fileCoverage = coverageResults.files.find(it => it.sourcePath === file)
return {
toSummary: () => {
return initPct(fileCoverage.summary)
}
}
},
getCoverageSummary: () => {
return initPct(coverageResults.summary)
}
}
}
}
const coverageReport = new CoverageReport(coverageOptions)
coverageReport.cleanCache()

// read v8 coverage data from tempDirectory
await coverageReport.addFromDir(argv.tempDirectory)

// generate report
await coverageReport.generate()
}

async getCoverageMapFromAllCoverageFiles () {
// the merge process can be very expensive, and it's often the case that
// check-coverage is called immediately after a report. We memoize the
Expand Down
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