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bundler-metro: allow configuring Metro bind host #70

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Merged
V3RON merged 2 commits into from
Mar 6, 2026
Merged

bundler-metro: allow configuring Metro bind host #70

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f809e04
bundler-metro: allow configuring metro bind host
hannojg Mar 5, 2026
266276b
feat(config): add host option for Metro bind address
V3RON Mar 6, 2026
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5 changes: 5 additions & 0 deletions .nx/version-plans/version-plan-1772810670470.md
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@@ -0,0 +1,5 @@
---
__default__: patch
---

Add a new host option to rn-harness.config for Metro bind host, replacing HARNESS_METRO_BIND_HOST.
6 changes: 6 additions & 0 deletions packages/bundler-metro/src/factory.ts
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Expand Up @@ -66,9 +66,15 @@ export const getMetroInstance = async (
.use('/status', getStatusMiddleware(projectRoot));

const ready = waitForBundler(reporter, abortSignal);
const metroBindHost = harnessConfig.host?.trim();
if (metroBindHost) {
logger.debug(`Binding Metro server to host ${metroBindHost}`);
}

const maybeServer = await Metro.runServer(config, {
waitForBundler: true,
unstable_extraMiddleware: [middleware],
...(metroBindHost ? { host: metroBindHost } : {}),
});

// Metro <0.83 returns the server directly, while 0.83+ returns an object with the server as a property.
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1 change: 1 addition & 0 deletions packages/config/src/types.ts
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Expand Up @@ -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()
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1 change: 1 addition & 0 deletions website/src/docs/getting-started/configuration.mdx
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Expand Up @@ -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`). |
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