feat(config): add host option for Metro bind address

Author: V3RON

.nx/version-plans/version-plan-1772810670470.md

@@ -0,0 +1,5 @@
+---
+__default__: patch
+---
+
+Add a new host option to rn-harness.config for Metro bind host, replacing HARNESS_METRO_BIND_HOST.

packages/bundler-metro/src/factory.ts

@@ -66,7 +66,7 @@ export const getMetroInstance = async (
     .use('/status', getStatusMiddleware(projectRoot));
 
   const ready = waitForBundler(reporter, abortSignal);
-  const metroBindHost = process.env.HARNESS_METRO_BIND_HOST?.trim();
+  const metroBindHost = harnessConfig.host?.trim();
   if (metroBindHost) {
     logger.debug(`Binding Metro server to host ${metroBindHost}`);
   }

packages/config/src/types.ts

@@ -21,6 +21,7 @@ export const ConfigSchema = z
       .min(1, 'App registry component name is required'),
     runners: z.array(RunnerSchema).min(1, 'At least one runner is required'),
     defaultRunner: z.string().optional(),
+    host: z.string().min(1, 'Host is required').optional(),
     webSocketPort: z.number().optional().default(3001),
     bridgeTimeout: z
       .number()

website/src/docs/getting-started/configuration.mdx

@@ -84,6 +84,7 @@ For Expo projects, the `entryPoint` should be set to the path specified in the `
 | `appRegistryComponentName`         | **Required.** Name of the component registered with AppRegistry.              |
 | `runners`                          | **Required.** Array of test runners (at least one required).                  |
 | `defaultRunner`                    | Default runner to use when none specified.                                    |
+| `host`                             | Hostname or IP address to bind the Metro server to (default: Metro default).  |
 | `bridgeTimeout`                    | Bridge timeout in milliseconds (default: `60000`).                            |
 | `bundleStartTimeout`               | Bundle start timeout in milliseconds (default: `15000`).                      |
 | `maxAppRestarts`                   | Maximum number of app restarts when app fails to report ready (default: `2`). |