feat: remove monocart-coverage-reports dependency

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.5.0] - 2026-07-04
+
+### Changed
+
+- **Remove `monocart-coverage-reports` dependency** — The CDP client is now implemented directly in `src/collector/cdp-client.ts` using Node.js 22's built-in `WebSocket` global, eliminating a large transitive dependency. The public API is unchanged.
+
+- **Bump `engines.node` to `>=22.0.0`** — Required for the native `WebSocket` global used by the new CDP client.
+
+- **Disable worker threads on Windows by default** — Worker threads are now automatically set to 0 on Windows (`process.platform === 'win32'`) to avoid a `STATUS_OBJECT_NAME_NOT_FOUND` (0xC0000034) crash caused by Rollup's native Rust binary (`@rollup/rollup-win32-x64-msvc`) failing to initialise in worker thread context. Processing falls back to single-threaded mode via the existing `runTaskDirect` path. Override with `NEXTCOV_WORKERS=<n>` or the `workers` fixture option if needed.
+
 ## [1.4.3] - 2026-06-30
 
 ### Added

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nextcov",
-  "version": "1.4.3",
+  "version": "1.5.0",
   "description": "Collect test coverage for Playwright E2E tests in Next.js applications",
   "author": "Steve Zhang",
   "license": "MIT",
@@ -49,7 +49,7 @@
     "vitest"
   ],
   "engines": {
-    "node": ">=20.19.0"
+    "node": ">=22.0.0"
   },
   "peerDependencies": {
     "@playwright/test": "^1.40.0"
@@ -68,7 +68,6 @@
     "istanbul-lib-report": "^3.0.1",
     "istanbul-lib-source-maps": "^5.0.0",
     "istanbul-reports": "^3.1.0",
-    "monocart-coverage-reports": "^2.12.12",
     "vite": "^8.1.2"
   },
   "devDependencies": {

src/__tests__/worker-pool.test.ts

@@ -229,18 +229,26 @@ describe('worker-pool', () => {
       await terminateWorkerPool() // Reset global pool
 
       const pool = getWorkerPool()
-      // Should fall back to auto-detection (min 2, max 8)
-      expect(pool.poolSize).toBeGreaterThanOrEqual(2)
-      expect(pool.poolSize).toBeLessThanOrEqual(8)
+      // Should fall back to auto-detection (min 2, max 8 on non-Windows; 0 on Windows)
+      if (process.platform === 'win32') {
+        expect(pool.poolSize).toBe(0)
+      } else {
+        expect(pool.poolSize).toBeGreaterThanOrEqual(2)
+        expect(pool.poolSize).toBeLessThanOrEqual(8)
+      }
     })
 
     it('should ignore negative NEXTCOV_WORKERS values', async () => {
       process.env.NEXTCOV_WORKERS = '-1'
       await terminateWorkerPool() // Reset global pool
 
       const pool = getWorkerPool()
-      // Should fall back to auto-detection
-      expect(pool.poolSize).toBeGreaterThanOrEqual(2)
+      // Should fall back to auto-detection (0 on Windows)
+      if (process.platform === 'win32') {
+        expect(pool.poolSize).toBe(0)
+      } else {
+        expect(pool.poolSize).toBeGreaterThanOrEqual(2)
+      }
     })
   })
 })

src/cli/commands/merge.ts

@@ -119,7 +119,7 @@ export function stripCoverageDirectives(coverageJson: Record<string, FileCoverag
 
   for (const [file, data] of Object.entries(coverageJson)) {
     // Read source file to check line content
-    let lines: string[] = []
+    let lines: string[]
     try {
       lines = readFileSync(file, 'utf-8').split('\n')
     } catch {