declare type HostArgFreeEventType = 'mounted' | 'beforeunmount'

interface HostAPI {
  on(type: HostArgFreeEventType, callback: () => void): void
  once(type: HostArgFreeEventType, callback: () => void): void
  off(type: HostArgFreeEventType, callback: () => void): void
  showPluginDockAsync(): Promise<void>
  sandbox: SandboxAPI
}

interface SandboxAPI {
  postMessage: (message: unknown) => void
  onmessage: (message: any) => void | undefined
  on: (event: 'message', cb: (message: any) => void) => void
  once: (event: 'message', cb: (message: any) => void) => void
  off: (event: 'message', cb: (message: any) => void) => void
}