tbonelee commented on code in PR #5109:
URL: https://github.com/apache/zeppelin/pull/5109#discussion_r2452941377
##########
zeppelin-web-angular/projects/zeppelin-sdk/src/interfaces/message-data-type-map.interface.ts:
##########
@@ -84,7 +84,7 @@ import { JobManagerDisabled, ListNoteJobs, ListUpdateNoteJobs
} from './message-
import { InterpreterBindings, InterpreterSetting } from
'./message-interpreter.interface';
import { OP } from './message-operator.interface';
-export type MixMessageDataTypeMap = MessageSendDataTypeMap &
MessageReceiveDataTypeMap;
+export type MessageDataTypeMap = MessageSendDataTypeMap |
MessageReceiveDataTypeMap;
Review Comment:
- After upgrading to TS4, using an intersection of send/receive maps caused
overlapping `OP` keys (e.g. `LIST_NOTE_JOBS`) to intersect their payload types
(e.g. `undefined & ListNoteJobs`), producing `never`.
- This broke `WebSocketMessage<keyof MessageSendDataTypeMap>` because
`MixMessageTypeMap[K]` evaluated to `never` for some `K`, leading to generic
constraint errors (TS2344) and lost inference.
- Switching `MixMessageTypeMap` to a union `(Send | Receive)` restores
correct indexed access `(Send[K] | Receive[K])` and fixes the errors.
- Also updated `WebSocketMessage` to a discriminated-union friendly form for
stable inference. (Type-only change; no runtime impact.)
### Note
To learn how applying `keyof` operator to union type or intersection type
works, see https://effectivetypescript.com/2024/08/30/keyof-puzzle/
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
