Implementing Authorization in RPC Requests with Effect RPC and CommandMetadata Layer

export class CommandMetadata extends Context.Tag("CommandMetadata")<
  CommandMetadata,
  { readonly userId: string | null }
>() {}
export const { userId: GetUserId } = Effect.serviceConstants(CommandMetadata);
export const makeCommandMetadataLayer = (userId: string | null) =>
  Layer.succeed(CommandMetadata, CommandMetadata.of({ userId }));