import { Queue , Subscription , createQueue } from 'effection' ; type Close < T > = T extends undefined ? ( ( ) => void ) : ( ( result : T ) => void ) ; type CloseKey < K , T > = T extends undefined ? ( ( key : K ) => void ) : ( ( key : K , result : T ) => void ) ; /**
 * A dispatch object which dispatches messages by key. See  createDispatch .
 *
 *  typeparam typeparam typeparam export interface Dispatch < K , V , TClose = undefined > { param key param value send ( key , value ) : void ; param key get ( key ) : Subscription < V , TClose > ; /**
     * Close all subscriptions
     */ close : Close < TClose > ; /**
     * Close the subscription with the given key
     */ closeKey : CloseKey < K , TClose > ; } /**
 * Create a new dispatch object. Messages sent to the dispatch object get put
 * into separate queues, based on the given key. Calling  get returns a
 * subscription which contains all messages sent to this key.
 *
 *  typeparam typeparam typeparam export function createDispatch < K , V , TClose = undefined > ( ) { let map = new Map < K , Queue < V , TClose > > ( ) ; function getQueue ( key ) { let queue = map . get ( key ) ; if ( queue ) { return queue ; } else { queue = createQueue ( ) ; map . set ( key , queue ) ; return queue ; } } return { send ( key , value ) { getQueue ( key ) . send ( value ) ; } , get ( key ) { return getQueue ( key ) . subscription ; } , close : ( ( result ) => { for ( let [ , value ] of map ) { value . closeWith ( result ) ; } map . clear ( ) ; } ) as Close < TClose > , closeKey : ( ( key , result ) => { let queue = map . get ( key ) ; if ( queue ) { queue . closeWith ( result ) ; map . delete ( key ) ; } } ) as CloseKey < K , TClose > } ; }