fix: review fixes

packages/coverage-v8/src/browser.ts

@@ -2,11 +2,9 @@ import { cdp } from '@vitest/browser/context'
 import type { V8CoverageProvider } from './provider'
 import { loadProvider } from './load-provider'
 
-interface ScriptCoverage {
-  result: Array<{ url: string }>
-}
+const session = cdp()
 
-const session = cdp() as { send: (...options: any[]) => any }
+type ScriptCoverage = Awaited<ReturnType<typeof session.send<'Profiler.takePreciseCoverage'>>>
 
 export default {
   async startCoverage() {
@@ -17,8 +15,8 @@ export default {
     })
   },
 
-  async takeCoverage() {
-    const coverage: ScriptCoverage = await session.send('Profiler.takePreciseCoverage')
+  async takeCoverage(): Promise<{ result: any[] }> {
+    const coverage = await session.send('Profiler.takePreciseCoverage')
     const result: typeof coverage.result = []
 
     // Reduce amount of data sent over rpc by doing some early result filtering

packages/coverage-v8/src/provider.ts

@@ -73,6 +73,7 @@ const VITE_EXPORTS_LINE_PATTERN
 const DECORATOR_METADATA_PATTERN
   = /_ts_metadata\("design:paramtypes", \[[^\]]*\]\),*/g
 const DEFAULT_PROJECT: unique symbol = Symbol.for('default-project')
+const FILE_PROTOCOL = 'file://'
 
 const debug = createDebug('vitest:coverage')
 let uniqueId = 0
@@ -441,7 +442,7 @@ export class V8CoverageProvider extends BaseCoverageProvider implements Coverage
 
     if (!transformResult) {
       isExecuted = false
-      transformResult = await onTransform(url.replace('file://', '')).catch(() => undefined)
+      transformResult = await onTransform(removeRoot(url, FILE_PROTOCOL)).catch(() => undefined)
     }
 
     const map = transformResult?.map as EncodedSourceMap | undefined
@@ -499,7 +500,7 @@ export class V8CoverageProvider extends BaseCoverageProvider implements Coverage
 
     async function onTransform(filepath: string) {
       if (transformMode === 'browser' && project.browser) {
-        const result = await project.browser.vite.transformRequest(filepath.replace(project.config.root, ''))
+        const result = await project.browser.vite.transformRequest(removeRoot(filepath, project.config.root))
 
         if (result) {
           return { ...result, code: `${result.code}// <inline-source-map>` }
@@ -512,11 +513,11 @@ export class V8CoverageProvider extends BaseCoverageProvider implements Coverage
 
     for (const result of coverage.result) {
       if (transformMode === 'browser') {
-        if (result.url.includes('@fs/')) {
-          result.url = `file://${result.url.replace('@fs/', '')}`
+        if (result.url.startsWith('/@fs')) {
+          result.url = `${FILE_PROTOCOL}${removeRoot(result.url, '/@fs')}`
         }
         else {
-          result.url = `file://${project.config.root}${result.url}`
+          result.url = `${FILE_PROTOCOL}${project.config.root}${result.url}`
         }
       }
 
@@ -635,3 +636,11 @@ function normalizeTransformResults(
 
   return normalized
 }
+
+function removeRoot(filepath: string, root: string) {
+  if (filepath.startsWith(root)) {
+    return filepath.slice(root.length)
+  }
+
+  return filepath
+}

packages/coverage-v8/tsconfig.json

@@ -1,7 +1,8 @@
 {
   "extends": "../../tsconfig.base.json",
   "compilerOptions": {
-    "moduleResolution": "Bundler"
+    "moduleResolution": "Bundler",
+    "types": ["@vitest/browser/providers/playwright"]
   },
   "include": ["./src/**/*.ts"],
   "exclude": ["./dist"]