Fix Playwright coverage collection and merge

e2e/fixtures.ts

@@ -0,0 +1,45 @@
+import fs from 'fs/promises';
+import path from 'path';
+import type { TestInfo } from '@playwright/test';
+import { expect, test as base, Page } from '@bgotink/playwright-coverage';
+
+const coverageDir = path.join(process.cwd(), 'coverage-reports', 'e2e', '.nyc_output');
+
+async function writeCoverageFile(page: Page, testInfo: TestInfo) {
+  try {
+    const coverage = await page.evaluate(() => (globalThis as any).__coverage__ ?? null);
+    if (!coverage || Object.keys(coverage).length === 0) return;
+
+    await fs.mkdir(coverageDir, { recursive: true });
+
+    const titleParts =
+      typeof testInfo.titlePath === 'function'
+        ? testInfo.titlePath()
+        : Array.isArray((testInfo as any).titlePath)
+          ? (testInfo as any).titlePath
+          : [testInfo.title];
+    const safeTitle = titleParts
+      .filter(Boolean)
+      .map((part) => part.replace(/[^a-zA-Z0-9-_]+/g, '_'))
+      .join('--')
+      .slice(0, 200);
+    const worker = typeof testInfo.workerIndex === 'number' ? `w${testInfo.workerIndex}` : 'w';
+    const filename = path.join(coverageDir, `coverage-${worker}-${Date.now()}-${safeTitle || 'test'}.json`);
+
+    await fs.writeFile(filename, JSON.stringify(coverage));
+    console.log('Wrote coverage file:', path.relative(process.cwd(), filename));
+  } catch (error) {
+    const msg = error instanceof Error ? error.message : String(error);
+    console.warn('Failed to collect coverage from page:', msg);
+  }
+}
+
+export const test = base.extend({
+  page: async ({ page }, use, testInfo) => {
+    await use(page);
+    await writeCoverageFile(page, testInfo);
+  },
+});
+
+export { expect };
+export type { Page };

e2e/picklist.spec.ts

@@ -1,5 +1,4 @@
-import { expect, test } from '@bgotink/playwright-coverage';
-import type { Page } from '@playwright/test';
+import { expect, test, Page } from './fixtures';
 
 import {
   areaName,

e2e/playwright-collect-coverage.spec.ts

@@ -1,57 +0,0 @@
-// e2e/playwright-collect-coverage.spec.ts
-import fs from 'fs';
-import path from 'path';
-import { test } from '@playwright/test';
-
-const EVAL_TIMEOUT_MS = 5000;
-const WRITE_TIMEOUT_MS = 15000;
-
-function withTimeout<T>(p: Promise<T>, ms: number, onTimeout?: () => void) {
-  let timer: NodeJS.Timeout | undefined;
-  const timeout = new Promise<T>((res) => {
-    timer = setTimeout(() => {
-      onTimeout?.();
-      // @ts-ignore resolve null on timeout
-      res(null);
-    }, ms);
-  });
-  return Promise.race([p, timeout]).then((r) => {
-    if (timer) clearTimeout(timer);
-    return r;
-  });
-}
-
-test.afterEach(async ({ page }, testInfo) => {
-  try {
-    console.log(`Collecting coverage for: ${testInfo.title}`);
-
-    // Evaluate coverage in page, but don't hang forever
-    const evalPromise = page.evaluate(() => (globalThis as any).__coverage__ || null);
-    const coverage = await withTimeout(evalPromise, EVAL_TIMEOUT_MS, () => {
-      console.warn('page.evaluate for coverage timed out');
-    });
-
-    if (!coverage || Object.keys(coverage).length === 0) {
-      console.log('No coverage collected (empty or timed out).');
-      return;
-    }
-
-    const dir = path.join(process.cwd(), '.nyc_output');
-    await fs.promises.mkdir(dir, { recursive: true });
-
-    const safeTitle = (testInfo.title || 'test').replace(/[^a-zA-Z0-9-_]/g, '_').slice(0, 120);
-    const worker = typeof testInfo.workerIndex === 'number' ? testInfo.workerIndex : process.pid;
-    const filename = path.join(dir, `coverage-e2e-w${worker}-${Date.now()}-${safeTitle}.json`);
-
-    // write asynchronously, bounded by timeout
-    const writePromise = fs.promises.writeFile(filename, JSON.stringify(coverage));
-    await withTimeout(writePromise, WRITE_TIMEOUT_MS, () => {
-      console.warn('Writing coverage file timed out');
-    });
-
-    console.log('Wrote coverage:', filename);
-  } catch (error: unknown) {
-    const msg = error instanceof Error ? error.message : String(error);
-    console.warn('Failed to collect coverage from page:', msg);
-  }
-});

e2e/product-filter.spec.ts

@@ -1,4 +1,4 @@
-import { expect, test } from '@bgotink/playwright-coverage';
+import { expect, test } from './fixtures';
 import {
   ensureProductsExist,
   areaName,

e2e/test-helpers.ts

@@ -1,5 +1,6 @@
 // e2e/test-helpers.ts
-import { expect, Page } from '@playwright/test';
+import { expect } from './fixtures';
+import type { Page } from '@playwright/test';
 
 /* -----------------------
    Shared constants

package.json

@@ -12,8 +12,8 @@
     "test:coverage": "vitest run --coverage",
     "test:e2e": "playwright test",
     "coverage:unit": "npm run test:coverage",
-    "coverage:e2e": "npm run test:e2e",
-    "coverage:merge": "node scripts/merge-lcov.cjs 'coverage-reports/unit/lcov.info' 'coverage-reports/e2e/coverage.lcov' > coverage-reports/merged/merged.lcov && node scripts/normalize-lcov.cjs coverage-reports/merged/merged.lcov && genhtml coverage-reports/merged/merged.normalized.lcov -o coverage-reports/merged",
+    "coverage:e2e": "node -e \"const fs=require('fs'); const path=require('path'); const target=path.join('coverage-reports','e2e'); fs.rmSync(target,{recursive:true,force:true});\" && npm run test:e2e && node scripts/remap-and-report.cjs",
+    "coverage:merge": "node -e \"const fs=require('fs'); fs.mkdirSync('coverage-reports/merged',{recursive:true});\" && node scripts/merge-lcov.cjs 'coverage-reports/unit/lcov.info' 'coverage-reports/e2e/lcov.info' > coverage-reports/merged/merged.lcov && node scripts/normalize-lcov.cjs coverage-reports/merged/merged.lcov && (command -v genhtml >/dev/null 2>&1 && genhtml coverage-reports/merged/merged.normalized.lcov -o coverage-reports/merged || echo 'genhtml not found, skipping HTML merge output')",
     "coverage:ci": "npm run coverage:unit && npm run coverage:e2e && npm run coverage:merge"
   },
   "dependencies": {

scripts/playwright-collect-coverage.cjs

@@ -8,7 +8,7 @@ test.afterEach(async ({ page }, testInfo) => {
     // evaluate coverage from the page
     const coverage = await page.evaluate(() => (globalThis.__coverage__ || {}));
     if (coverage && Object.keys(coverage).length) {
-      const dir = path.join(process.cwd(), '.nyc_output');
+      const dir = path.join(process.cwd(), 'coverage-reports', 'e2e', '.nyc_output');
       fs.mkdirSync(dir, { recursive: true });
 
       // unique file per worker/test

scripts/remap-and-report.cjs

@@ -6,10 +6,11 @@ const libSourceMaps = require('istanbul-lib-source-maps');
 const libReport = require('istanbul-lib-report');
 const reports = require('istanbul-reports');
 
+async function main() {
   const out = libCoverage.createCoverageMap({});
-const dir = path.join(process.cwd(), '.nyc_output');
+  const dir = path.join(process.cwd(), 'coverage-reports', 'e2e', '.nyc_output');
   if (!fs.existsSync(dir)) {
-  console.error('.nyc_output not found');
+    console.error('.nyc_output not found at', dir);
     process.exit(2);
   }
   const files = fs.readdirSync(dir).filter(f => f.endsWith('.json'));
@@ -18,18 +19,26 @@ for (const f of files) {
     out.merge(data);
   }
 
-// Remap using source maps
+  if (out.size === 0) {
+    console.error('No coverage entries were merged.');
+    process.exit(3);
+  }
+
   const sourceMapStore = libSourceMaps.createSourceMapStore();
-const transformed = sourceMapStore.transformCoverage(out);
-const remapped = transformed.map;
+  const transformed = await sourceMapStore.transformCoverage(out);
+  const remapped = libCoverage.createCoverageMap(transformed.map || transformed.data || {});
 
-// Write reports
   const outDir = path.join(process.cwd(), 'coverage-reports', 'e2e');
   fs.mkdirSync(outDir, { recursive: true });
   const context = libReport.createContext({ dir: outDir, coverageMap: remapped });
 
-// lcov + html
   reports.create('lcovonly', {}).execute(context);
   reports.create('html', {}).execute(context);
 
   console.log('Wrote remapped e2e coverage to', outDir);
+}
+
+main().catch(err => {
+  console.error(err);
+  process.exit(1);
+});