Add experiment to configure internal debugger branding (#44388)

Summary:
Pull Request resolved: #44388

Towards the open source rollout of the `rn_fusebox.ts` entry point.

NOTE: Requires facebookexperimental/rn-chrome-devtools-frontend#59, but can (and should) be landed safely beforehand.

Changelog: [Internal]

Reviewed By: motiz88

Differential Revision: D56883040

packages/dev-middleware/src/createDevMiddleware.js

@@ -129,5 +129,6 @@ function getExperiments(config: ExperimentsConfig): Experiments {
  enableNewDebugger: config.enableNewDebugger ?? false,
  enableOpenDebuggerRedirect: config.enableOpenDebuggerRedirect ?? false,
  enableNetworkInspector: config.enableNetworkInspector ?? false,
+ useInternalBranding: config.useInternalBranding ?? false,
  };
 }

packages/dev-middleware/src/types/Experiments.js

@@ -28,6 +28,12 @@ export type Experiments = $ReadOnly<{
  * Enables the Network panel when launching the custom debugger frontend.
  */
  enableNetworkInspector: boolean,
+
+ /**
+ * [Meta-internal] Controls visibility of the internal "Fusebox" codename
+ * across the UI when using the modern `rn_fusebox` entry point.
+ */
+ useFuseboxInternalBranding: boolean,
 }>;
 
 export type ExperimentsConfig = Partial<Experiments>;

packages/dev-middleware/src/utils/getDevToolsFrontendUrl.js

@@ -44,6 +44,12 @@ export default function getDevToolsFrontendUrl(
  if (experiments.enableNetworkInspector) {
  searchParams.append('unstable_enableNetworkPanel', 'true');
  }
+ if (
+ options?.useFuseboxEntryPoint === true &&
+ experiments.useFuseboxInternalBranding
+ ) {
+ searchParams.append('unstable_useInternalBranding', 'true');
+ }
  if (options?.launchId != null && options.launchId !== '') {
  searchParams.append('launchId', options.launchId);
  }