feat(vitest): include coverageMap in json report (#6606)

docs/guide/reporters.md

@@ -263,7 +263,7 @@ export default defineConfig({
 
 ### JSON Reporter
 
-Outputs a report of the test results in JSON format. Can either be printed to the terminal or written to a file using the [`outputFile`](/config/#outputfile) configuration option.
+Generates a report of the test results in a JSON format compatible with Jest's `--json` option. Can either be printed to the terminal or written to a file using the [`outputFile`](/config/#outputfile) configuration option.
 
 :::code-group
 ```bash [CLI]
@@ -322,10 +322,15 @@ Example of a JSON report:
       "message": "",
       "name": "/root-directory/__tests__/test-file-1.test.ts"
     }
-  ]
+  ],
+  "coverageMap": {}
 }
 ```
 
+::: info
+Since Vitest 2.2, the JSON reporter includes coverage information in `coverageMap` if coverage is enabled.
+:::
+
 ### HTML Reporter
 
 Generates an HTML file to view test results through an interactive [GUI](/guide/ui). After the file has been generated, Vitest will keep a local development server running and provide a link to view the report in a browser.

packages/vitest/src/node/reporters/json.ts

@@ -1,5 +1,6 @@
 import type { File, Suite, TaskMeta, TaskState } from '@vitest/runner'
 import type { SnapshotSummary } from '@vitest/snapshot'
+import type { CoverageMap } from 'istanbul-lib-coverage'
 import type { Vitest } from '../core'
 import type { Reporter } from '../types/reporter'
 import { existsSync, promises as fs } from 'node:fs'
@@ -63,7 +64,7 @@ export interface JsonTestResults {
   success: boolean
   testResults: Array<JsonTestResult>
   snapshot: SnapshotSummary
-  // coverageMap?: CoverageMap | null | undefined
+  coverageMap?: CoverageMap | null | undefined
   // numRuntimeErrorTestSuites: number
   // wasInterrupted: boolean
 }
@@ -86,7 +87,7 @@ export class JsonReporter implements Reporter {
     this.start = Date.now()
   }
 
-  protected async logTasks(files: File[]) {
+  protected async logTasks(files: File[], coverageMap?: CoverageMap | null) {
     const suites = getSuites(files)
     const numTotalTestSuites = suites.length
     const tests = getTests(files)
@@ -188,13 +189,14 @@ export class JsonReporter implements Reporter {
       startTime: this.start,
       success,
       testResults,
+      coverageMap,
     }
 
     await this.writeReport(JSON.stringify(result))
   }
 
-  async onFinished(files = this.ctx.state.getFiles()) {
-    await this.logTasks(files)
+  async onFinished(files = this.ctx.state.getFiles(), _errors: unknown[] = [], coverageMap?: unknown) {
+    await this.logTasks(files, coverageMap as CoverageMap)
   }
 
   /**

test/workspaces/globalTest.ts

@@ -37,6 +37,7 @@ export async function teardown() {
     assert.equal(results.numTotalTestSuites, 28)
     assert.equal(results.numTotalTests, 31)
     assert.equal(results.numPassedTests, 31)
+    assert.ok(results.coverageMap)
 
     const shared = results.testResults.filter((r: any) => r.name.includes('space_shared/test.spec.ts'))