fix: comprehensive type import fixes and test migration

- Fix integration test-runner .js -> .ts imports
- Migrate test-runner-core tests from mocha to node:test
- Migrate test-runner-chrome/playwright/puppeteer from mocha to node --test
- Add node:test describe/it imports to all test files missing them
- Fix all type-only imports across 25+ files (BrowserLauncher,
  TestRunnerCoreConfig, Logger, EntrypointBundle, etc.)
- Fix playwright type imports (Browser, Page, LaunchOptions)
- Fix polyfills-loader regenerator-runtime path (.js extension)
- Add rollup-plugin-html test fixtures from fix/node24
- Remove unused beforeEach/afterEach imports
- Fix BufferedLogger/TestSessionManager back to value imports

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

integration/test-runner/index.ts

@@ -1,11 +1,11 @@
-import { BrowserLauncher, TestRunnerCoreConfig } from '@web/test-runner-core';
-import { runBasicTest } from './tests/basic/runBasicTest.js';
-import { runConfigGroupsTest } from './tests/config-groups/runConfigGroupsTest.js';
-import { runParallelTest } from './tests/parallel/runParallelTest.js';
-import { runTestFailureTest } from './tests/test-failure/runTestFailureTest.js';
-import { runLocationChangeTest } from './tests/location-change/runLocationChangeTest.js';
-import { runFocusTest } from './tests/focus/runFocusTest.js';
-import { runManyTests } from './tests/many/runManyTests.js';
+import type { BrowserLauncher, TestRunnerCoreConfig } from '@web/test-runner-core';
+import { runBasicTest } from './tests/basic/runBasicTest.ts';
+import { runConfigGroupsTest } from './tests/config-groups/runConfigGroupsTest.ts';
+import { runParallelTest } from './tests/parallel/runParallelTest.ts';
+import { runTestFailureTest } from './tests/test-failure/runTestFailureTest.ts';
+import { runLocationChangeTest } from './tests/location-change/runLocationChangeTest.ts';
+import { runFocusTest } from './tests/focus/runFocusTest.ts';
+import { runManyTests } from './tests/many/runManyTests.ts';
 
 export interface Tests {
   basic: boolean;

integration/test-runner/tests/basic/runBasicTest.ts

@@ -1,8 +1,8 @@
-import { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
+import { describe, it } from 'node:test';
+import type { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve } from 'path';
-import { expect } from 'chai';
 
 export function runBasicTest(
   config: Partial<TestRunnerCoreConfig> & { browsers: BrowserLauncher[] },

integration/test-runner/tests/config-groups/runConfigGroupsTest.ts

@@ -1,12 +1,12 @@
+import { describe, it } from 'node:test';
 import {
-  BrowserLauncher,
-  TestRunnerCoreConfig,
-  TestRunnerGroupConfig,
+  type BrowserLauncher,
+  type TestRunnerCoreConfig,
+  type TestRunnerGroupConfig,
 } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve } from 'path';
-import { expect } from 'chai';
 
 export function runConfigGroupsTest(
   config: Partial<TestRunnerCoreConfig> & { browsers: BrowserLauncher[] },

integration/test-runner/tests/focus/runFocusTest.ts

@@ -1,8 +1,8 @@
-import { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
+import { describe, it } from 'node:test';
+import type { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve } from 'path';
-import { expect } from 'chai';
 
 export function runFocusTest(
   config: Partial<TestRunnerCoreConfig> & { browsers: BrowserLauncher[] },

integration/test-runner/tests/location-change/runLocationChangeTest.ts

@@ -1,8 +1,8 @@
-import { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
+import { describe, it } from 'node:test';
+import type { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve } from 'path';
-import { expect } from 'chai';
 
 export function runLocationChangeTest(
   config: Partial<TestRunnerCoreConfig> & { browsers: BrowserLauncher[] },

integration/test-runner/tests/many/runManyTests.ts

@@ -1,4 +1,5 @@
-import { BrowserLauncher, TestRunnerCoreConfig } from '@web/test-runner-core';
+import { describe, it } from 'node:test';
+import type { BrowserLauncher, TestRunnerCoreConfig } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve } from 'path';

integration/test-runner/tests/parallel/runParallelTest.ts

@@ -1,4 +1,5 @@
-import { BrowserLauncher, TestRunnerCoreConfig } from '@web/test-runner-core';
+import { describe, it } from 'node:test';
+import type { BrowserLauncher, TestRunnerCoreConfig } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve } from 'path';

integration/test-runner/tests/test-failure/runTestFailureTest.ts

@@ -1,8 +1,8 @@
-import { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
+import { describe, it } from 'node:test';
+import type { BrowserLauncher, TestRunnerCoreConfig, TestSession } from '@web/test-runner-core';
 import { runTests } from '@web/test-runner-core/test-helpers';
 import { legacyPlugin } from '@web/dev-server-legacy';
 import { resolve, sep } from 'path';
-import { expect } from 'chai';
 
 const ERROR_NOT_IMPORTABLE = {
   message:

packages/dev-server-core/src/plugins/Plugin.ts

@@ -1,7 +1,7 @@
 import { FSWatcher } from 'chokidar';
 import type { Context } from 'koa';
 import Koa from 'koa';
-import { Server } from 'net';
+import { type Server } from 'net';
 
 import type { DevServerCoreConfig } from '../server/DevServerCoreConfig.ts';
 import type { Logger } from '../logger/Logger.ts';

packages/dev-server-core/test/server/DevServer.test.ts

@@ -3,11 +3,11 @@ import assert from 'node:assert/strict';
 import express from 'express';
 import http from 'http';
 import Koa from 'koa';
-import { Server } from 'net';
+import { type Server } from 'net';
 import { FSWatcher } from 'chokidar';
 import portfinder from 'portfinder';
 import { Stub, stubMethod } from 'hanbi';
-import { ServerStartParams } from '../../src/plugins/Plugin.ts';
+import { type ServerStartParams } from '../../src/plugins/Plugin.ts';
 import { DevServer } from '../../src/server/DevServer.ts';
 import { createTestServer } from '../helpers.ts';