cherry-pick(#15901): fix(test-runner): multiple webServer types (#15916)

SHA: 004cd9273c

packages/playwright-test/types/test.d.ts

@@ -487,7 +487,7 @@ interface TestConfig {
    * ```
    *
    */
-  webServer?: TestConfigWebServer;
+  webServer?: TestConfigWebServer | TestConfigWebServer[];
   /**
    * Configuration for the `expect` assertion library. Learn more about [various timeouts](https://playwright.dev/docs/test-timeouts).
    *

tests/playwright-test/config.spec.ts

@@ -391,3 +391,29 @@ test('should work with undefined values and base', async ({ runInlineTest }) =>
   expect(result.exitCode).toBe(0);
   expect(result.passed).toBe(1);
 });
+
+test('should have correct types for the config', async ({ runTSC }) => {
+  const result = await runTSC({
+    'playwright.config.ts': `
+      import type { PlaywrightTestConfig } from '@playwright/test';
+
+      const config: PlaywrightTestConfig = {
+        webServer: [
+          {
+            command: 'echo 123',
+            env: { PORT: '123' },
+            port: 123,
+          },
+          {
+            command: 'echo 123',
+            env: { NODE_ENV: 'test' },
+            port: 8082,
+          },
+        ],
+      };
+      
+      export default config;
+  `
+  });
+  expect(result.exitCode).toBe(0);
+});

utils/generate_types/overrides-test.d.ts

@@ -58,7 +58,7 @@ type LiteralUnion<T extends U, U = string> = T | (U & { zz_IGNORE_ME?: never });
 
 interface TestConfig {
   reporter?: LiteralUnion<'list'|'dot'|'line'|'github'|'json'|'junit'|'null'|'html', string> | ReporterDescription[];
-  webServer?: TestConfigWebServer;
+  webServer?: TestConfigWebServer | TestConfigWebServer[];
 }
 
 export interface Config<TestArgs = {}, WorkerArgs = {}> extends TestConfig {