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This commit is contained in:
tamaina 2021-09-07 03:31:56 +09:00
parent be47a120d7
commit fd55e2b5b5
1 changed files with 7 additions and 3 deletions
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10
src/server/api/stream/types.ts
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@ -294,9 +294,13 @@ export type StreamMessages = {
//#endregion
// API event definitions
type EventsDictionary = { [x in keyof StreamMessages]: { [y in StreamMessages[x]['name']]: (e: StreamMessages[x]['spec']) => void } };
type Events<D> = (D extends any ? (k: D) => void : never) extends ((k: infer E) => void) ? E : never;
export type StreamEventEmitter = Emitter<EventEmitter, Events<EventsDictionary[keyof StreamMessages]>>;
// ストリームごとのEmitterの辞書を用意
type EventsDictionary = { [x in keyof StreamMessages]: Emitter<EventEmitter, { [y in StreamMessages[x]['name']]: (e: StreamMessages[x]['spec']) => void }> };
// 共用体型を交差型にする型 https://stackoverflow.com/questions/54938141/typescript-convert-union-to-intersection
type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never;
// Emitter辞書をストリームごとに共用体型にし、UnionToIntersectionで交差型にする
export type StreamEventEmitter = UnionToIntersection<EventsDictionary[keyof StreamMessages]>;
// そうしないとなぜかユニオン型が増えまくり、ts(2590)にひっかかる
// provide stream channels union
export type StreamChannels = StreamMessages[keyof StreamMessages]['name'] | 'notesStream';