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istanbul.ts
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istanbul.ts
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import { existsSync, promises as fs } from 'fs'
import { createRequire } from 'module'
import { resolve } from 'pathe'
import type { ExistingRawSourceMap, TransformPluginContext } from 'rollup'
import { configDefaults, defaultExclude, defaultInclude } from '../../defaults'
import type { Vitest } from '../../node'
import type { IstanbulOptions, ResolvedCoverageOptions } from '../../types'
import type { BaseCoverageReporter } from './base'
const require = createRequire(import.meta.url)
const coverageVariable = '__VITEST_COVERAGE__'
interface Instrumenter {
/* Instrument the supplied code and track coverage against the supplied filename. It throws if invalid code is passed to it. ES5 and ES6 syntax is supported. To instrument ES6 modules, make sure that you set the esModules property to true when creating the instrumenter. */
instrumentSync(
/* The code to instrument */
code: string,
/* The filename against which to track coverage. */
filename: string,
/* The source map that maps the not instrumented code back to it's original form. Is assigned to the coverage object and therefore, is available in the json output and can be used to remap the coverage to the untranspiled source.): string; */
inputSourceMap: object
): string
/* Returns the file coverage object for the last file instrumented. */
lastSourceMap(): ExistingRawSourceMap
}
interface TestExclude {
new(opts: {
cwd?: string | string[]
include?: string | string[]
exclude?: string | string[]
extension?: string | string[]
excludeNodeModules?: boolean
}): { shouldInstrument(filePath: string): boolean }
}
export class IstanbulReporter implements BaseCoverageReporter {
ctx!: Vitest
options!: ResolvedCoverageOptions & { provider: 'istanbul' }
instrumenter!: Instrumenter
testExclude!: InstanceType<TestExclude>
coverages: any[] = []
initialize(ctx: Vitest) {
this.ctx = ctx
this.options = resolveIstanbulOptions(ctx.config.coverage, ctx.config.root)
const { createInstrumenter } = require('istanbul-lib-instrument')
this.instrumenter = createInstrumenter(this.options)
const TestExclude = require('test-exclude')
this.testExclude = new TestExclude({
cwd: ctx.config.root,
exclude: [...defaultExclude, ...defaultInclude],
extension: ['.js', '.cjs', '.mjs', '.ts', '.tsx', '.jsx', '.vue', '.svelte'],
excludeNodeModules: true,
})
}
resolveOptions(): ResolvedCoverageOptions {
return this.options
}
onFileTransform(sourceCode: string, id: string, pluginCtx: TransformPluginContext) {
if (!this.testExclude.shouldInstrument(id))
return
// TODO: Sourcemaps are not accurate.
// The c8 is using some "magic number" of 224 as offset. Maybe that one is required here.
// eslint-disable-next-line @typescript-eslint/no-unused-vars -- ignoreRestSiblings should be enabled
const { sourcesContent, ...sourceMap } = pluginCtx.getCombinedSourcemap()
const code = this.instrumenter.instrumentSync(sourceCode, id, sourceMap)
const map = this.instrumenter.lastSourceMap()
return { code, map }
}
onAfterSuiteRun(coverage: any) {
// TODO: Some implementations write these into file system instead of storing in memory.
// Then when merging the results, JSONs are read & deleted from fs and convert into coverageMap
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 = []
}
onAfterAllFilesRun() {
const libReport = require('istanbul-lib-report')
const reports = require('istanbul-reports')
const libCoverage = require('istanbul-lib-coverage')
const coverageMap = this.coverages.reduce((coverage, previousCoverageMap) => {
const map = libCoverage.createCoverageMap(coverage)
map.merge(previousCoverageMap)
return map
}, {})
const context = libReport.createContext({
dir: this.options.reportsDirectory,
coverageMap,
})
for (const reporter of this.options.reporter)
reports.create(reporter).execute(context)
}
}
function resolveIstanbulOptions(options: IstanbulOptions, root: string) {
const reportsDirectory = resolve(root, options.reportsDirectory || configDefaults.coverage.reportsDirectory!)
const resolved = {
...configDefaults.coverage,
// Custom
provider: 'istanbul',
coverageVariable,
coverageGlobalScope: 'globalThis',
coverageGlobalScopeFunc: false,
esModules: true,
// Defaults from nyc, https://github.com/istanbuljs/nyc/blob/master/lib/instrumenters/istanbul.js#L7
preserveComments: true,
produceSourceMap: true,
autoWrap: true,
// Overrides
...options,
reportsDirectory,
tempDirectory: resolve(reportsDirectory, 'tmp'),
}
return resolved as ResolvedCoverageOptions & { provider: 'istanbul' }
}