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provider.ts
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provider.ts
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/* eslint-disable no-restricted-imports */
import { existsSync, promises as fs } from 'fs'
import { relative, resolve } from 'pathe'
import type { TransformPluginContext } from 'rollup'
import type { AfterSuiteRunMeta, CoverageIstanbulOptions, CoverageProvider, ResolvedCoverageOptions, Vitest } from 'vitest'
import { configDefaults, defaultExclude, defaultInclude } from 'vitest/config'
import libReport from 'istanbul-lib-report'
import reports from 'istanbul-reports'
import type { CoverageMap } from 'istanbul-lib-coverage'
import libCoverage from 'istanbul-lib-coverage'
import libSourceMaps from 'istanbul-lib-source-maps'
import { type Instrumenter, createInstrumenter } from 'istanbul-lib-instrument'
// @ts-expect-error missing types
import _TestExclude from 'test-exclude'
import { COVERAGE_STORE_KEY } from './constants'
type Threshold = 'lines' | 'functions' | 'statements' | 'branches'
interface TestExclude {
new(opts: {
cwd?: string | string[]
include?: string | string[]
exclude?: string | string[]
extension?: string | string[]
excludeNodeModules?: boolean
}): {
shouldInstrument(filePath: string): boolean
glob(cwd: string): Promise<string[]>
}
}
export class IstanbulCoverageProvider implements CoverageProvider {
name = 'istanbul'
ctx!: Vitest
options!: ResolvedCoverageOptions & CoverageIstanbulOptions & { provider: 'istanbul' }
instrumenter!: Instrumenter
testExclude!: InstanceType<TestExclude>
/**
* Coverage objects collected from workers.
* Some istanbul utilizers write these into file system instead of storing in memory.
* If storing in memory causes issues, we can simply write these into fs in `onAfterSuiteRun`
* and read them back when merging coverage objects in `onAfterAllFilesRun`.
*/
coverages: any[] = []
initialize(ctx: Vitest) {
this.ctx = ctx
this.options = resolveIstanbulOptions(ctx.config.coverage, ctx.config.root)
this.instrumenter = createInstrumenter({
produceSourceMap: true,
autoWrap: false,
esModules: true,
compact: false,
coverageVariable: COVERAGE_STORE_KEY,
// @ts-expect-error missing type
coverageGlobalScope: 'globalThis',
coverageGlobalScopeFunc: false,
ignoreClassMethods: this.options.ignoreClassMethods,
})
this.testExclude = new _TestExclude({
cwd: ctx.config.root,
include: typeof this.options.include === 'undefined' ? undefined : [...this.options.include],
exclude: [...defaultExclude, ...defaultInclude, ...this.options.exclude],
excludeNodeModules: true,
extension: configDefaults.coverage.extension,
})
}
resolveOptions(): ResolvedCoverageOptions {
return this.options
}
onFileTransform(sourceCode: string, id: string, pluginCtx: TransformPluginContext) {
if (!this.testExclude.shouldInstrument(id))
return
const sourceMap = pluginCtx.getCombinedSourcemap()
const code = this.instrumenter.instrumentSync(sourceCode, id, sourceMap as any)
const map = this.instrumenter.lastSourceMap() as any
return { code, map }
}
onAfterSuiteRun({ coverage }: AfterSuiteRunMeta) {
this.coverages.push(coverage)
}
async clean(clean = true) {
if (clean && existsSync(this.options.reportsDirectory))
await fs.rm(this.options.reportsDirectory, { recursive: true, force: true })
this.coverages = []
}
async reportCoverage() {
const mergedCoverage: CoverageMap = this.coverages.reduce((coverage, previousCoverageMap) => {
const map = libCoverage.createCoverageMap(coverage)
map.merge(previousCoverageMap)
return map
}, {})
if (this.options.all)
await this.includeUntestedFiles(mergedCoverage)
const sourceMapStore = libSourceMaps.createSourceMapStore()
const coverageMap: CoverageMap = await sourceMapStore.transformCoverage(mergedCoverage)
const context = libReport.createContext({
dir: this.options.reportsDirectory,
coverageMap,
sourceFinder: sourceMapStore.sourceFinder,
watermarks: this.options.watermarks,
})
for (const reporter of this.options.reporter) {
reports.create(reporter as any, {
skipFull: this.options.skipFull,
projectRoot: this.ctx.config.root,
}).execute(context)
}
if (this.options.branches
|| this.options.functions
|| this.options.lines
|| this.options.statements) {
this.checkThresholds(coverageMap, {
branches: this.options.branches,
functions: this.options.functions,
lines: this.options.lines,
statements: this.options.statements,
})
}
}
checkThresholds(coverageMap: CoverageMap, thresholds: Record<Threshold, number | undefined>) {
// Construct list of coverage summaries where thresholds are compared against
const summaries = this.options.perFile
? coverageMap.files()
.map((file: string) => ({
file,
summary: coverageMap.fileCoverageFor(file).toSummary(),
}))
: [{
file: null,
summary: coverageMap.getCoverageSummary(),
}]
// Check thresholds of each summary
for (const { summary, file } of summaries) {
for (const thresholdKey of ['lines', 'functions', 'statements', 'branches'] as const) {
const threshold = thresholds[thresholdKey]
if (threshold !== undefined) {
const coverage = summary.data[thresholdKey].pct
if (coverage < threshold) {
process.exitCode = 1
/*
* Generate error message based on perFile flag:
* - ERROR: Coverage for statements (33.33%) does not meet threshold (85%) for src/math.ts
* - ERROR: Coverage for statements (50%) does not meet global threshold (85%)
*/
let errorMessage = `ERROR: Coverage for ${thresholdKey} (${coverage}%) does not meet`
if (!this.options.perFile)
errorMessage += ' global'
errorMessage += ` threshold (${threshold}%)`
if (this.options.perFile && file)
errorMessage += ` for ${relative('./', file).replace(/\\/g, '/')}`
console.error(errorMessage)
}
}
}
}
}
async includeUntestedFiles(coverageMap: CoverageMap) {
// Load, instrument and collect empty coverages from all files which
// are not already in the coverage map
const includedFiles = await this.testExclude.glob(this.ctx.config.root)
const uncoveredFiles = includedFiles
.map(file => resolve(this.ctx.config.root, file))
.filter(file => !coverageMap.data[file])
const transformResults = await Promise.all(uncoveredFiles.map(async (filename) => {
const transformResult = await this.ctx.vitenode.transformRequest(filename)
return { transformResult, filename }
}))
for (const { transformResult, filename } of transformResults) {
const sourceMap = transformResult?.map
if (sourceMap) {
this.instrumenter.instrumentSync(
transformResult.code,
filename,
sourceMap as any,
)
const lastCoverage = this.instrumenter.lastFileCoverage()
if (lastCoverage)
coverageMap.addFileCoverage(lastCoverage)
}
}
}
}
function resolveIstanbulOptions(options: CoverageIstanbulOptions, root: string) {
const reportsDirectory = resolve(root, options.reportsDirectory || configDefaults.coverage.reportsDirectory!)
const resolved = {
...configDefaults.coverage,
...options,
provider: 'istanbul',
reportsDirectory,
tempDirectory: resolve(reportsDirectory, 'tmp'),
reporter: Array.isArray(options.reporter) ? options.reporter : [options.reporter],
}
return resolved as ResolvedCoverageOptions & { provider: 'istanbul' }
}