// This gets assigned as a side-effect during app initialization. Because it
// represents the build used to create the JS bundle, it should never change
// after being set, so we store it in a global variable.
//
// When performing RSC requests, if the incoming data has a different build ID,
// we perform an MPA navigation/refresh to load the updated build and ensure
// that the client and server in sync.
//
// Starts as an empty string. In practice, because setNavigationBuildId is called during initialization
// before hydration starts, this will always get reassigned to the actual ID before it's ever needed
// by a navigation. If for some reasons it didn't, due to a bug or race condition, then on
// navigation the build comparision would fail and trigger an MPA navigation.
//
// Note that this can also be initialized with the deployment id instead (if available). So it's not
// the same as "the build id", but we are running out of alternative names for "build id or
// deployment id".
let globalBuildId: string = ''

export function setNavigationBuildId(buildId: string) {
  globalBuildId = buildId
}

export function getNavigationBuildId(): string {
  return globalBuildId
}