Generates TypeScript types and functions for typed channel event subscriptions.

For each declared event in a typed channel module, introspects the matching Ash PubSub publication's returns type (auto-derived via transform :calc or explicitly set) and maps it to a TypeScript type.

Generated Output

Types (emitted into ash_types.ts):

// Branded channel type — only creatable via createOrgChannel
export type OrgChannel = {
  readonly __channelType: "OrgChannel";
  on(event: string, callback: (payload: unknown) => void): number;
  off(event: string, ref: number): void;
};

// Payload types
export type ItemCreatedPayload = string;

// Events map
export type OrgChannelEvents = { item_created: ItemCreatedPayload; };

// Utility types for onOrgChannelMessages / unsubscribeOrgChannel
export type OrgChannelHandlers = { ... };
export type OrgChannelRefs = { ... };

Functions (emitted into the typed channels output file, e.g. ash_typed_channels.ts):

// Factory — the only way to obtain an OrgChannel
export function createOrgChannel(socket, suffix: string): OrgChannel { ... }

// Single-event subscription
export function onOrgChannelMessage<E extends keyof OrgChannelEvents>(
  channel: OrgChannel, event: E, handler: ...
): number { ... }

// Multi-event subscription
export function onOrgChannelMessages(channel: OrgChannel, handlers: OrgChannelHandlers): OrgChannelRefs { ... }

// Cleanup
export function unsubscribeOrgChannel(channel: OrgChannel, refs: OrgChannelRefs): void { ... }