set type module, simplify tests, update deps

test/coverage.js

@@ -0,0 +1,36 @@
+import { randomUUID } from 'crypto';
+import { promises as fs } from 'fs';
+import * as path from 'path';
+import { test } from 'playwright/test';
+
+// See also https://playwright.dev/docs/api/class-coverage
+
+if (process.env.COVERAGE) {
+  test.beforeEach(async ({ page }) => {
+    await page.coverage.startJSCoverage();
+  });
+
+  test.afterEach(async ({ page }) => {
+    const coverage = await page.coverage.stopJSCoverage();
+
+    const output = {
+      result: coverage.map((entry) => ({
+        ...entry,
+        url: resolveFileUrl(entry.url),
+      })),
+    };
+
+    await fs.mkdir('coverage/tmp', { recursive: true });
+    await fs.writeFile(
+      `coverage/tmp/coverage-${randomUUID()}.json`,
+      JSON.stringify(output),
+    );
+  });
+}
+
+function resolveFileUrl(url) {
+  return url.replace(
+    'http://localhost:8080',
+    `file://${path.resolve('public')}`,
+  );
+}