Known* definitions mission in TS Generation

[sarangan12]

For the following Typespec definition:

/** Acs Router Job Status */
union AcsRouterJobStatus {
  /** Router Job Status Pending Classification */
  "PendingClassification",
  /** Router Job Status Queued */
  "Queued",
  /** Router Job Status Assigned */
  "Assigned",
  /** Router Job Status Completed */
  "Completed",
  /** Router Job Status Closed */
  "Closed",
  /** Router Job Status Cancelled */
  "Cancelled",
  /** Router Job Status Classification Failed */
  "ClassificationFailed",
  /** Router Job Status Created */
  "Created",
  /** Router Job Status Pending Schedule */
  "PendingSchedule",
  /** Router Job Status Scheduled */
  "Scheduled",
  /** Router Job Status Schedule Failed */
  "ScheduleFailed",
  /** Router Job Status Waiting For Activation */
  "WaitingForActivation",
  string,
}

Now, If you look at the generated SDK, it looks like the following:

// @public
export type AcsRouterJobStatus = string;

But, If you look at the similar swagger generated SDK, you can find a definition as:

/** Known values of {@link AcsRouterJobStatus} that the service accepts. */
export const enum KnownAcsRouterJobStatus {
  PendingClassification = "PendingClassification",
  Queued = "Queued",
  Assigned = "Assigned",
  Completed = "Completed",
  Closed = "Closed",
  Cancelled = "Cancelled",
  ClassificationFailed = "ClassificationFailed",
  Created = "Created",
  PendingSchedule = "PendingSchedule",
  Scheduled = "Scheduled",
  ScheduleFailed = "ScheduleFailed",
  WaitingForActivation = "WaitingForActivation"
}

/**
 * Defines values for AcsRouterJobStatus. \
 * {@link KnownAcsRouterJobStatus} can be used interchangeably with AcsRouterJobStatus,
 *  this enum contains the known values that the service supports.
 * ### Known values supported by the service
 * **PendingClassification** \
 * **Queued** \
 * **Assigned** \
 * **Completed** \
 * **Closed** \
 * **Cancelled** \
 * **ClassificationFailed** \
 * **Created** \
 * **PendingSchedule** \
 * **Scheduled** \
 * **ScheduleFailed** \
 * **WaitingForActivation**
 */
export type AcsRouterJobStatus = string;

i.e You should always have a Known* Model generated. But, it is not happening on the TS Generator. I am expecting a similar definition in the Typespec generated SDK also.

@xirzec @lmazuel FYI

[MaryGao]

@sarangan12 will the event grid generated as the modular SDK? is this SDK GAed?

This is the intermedia state for extensible enum and there are two design issues in progress. And we need to support it once the designed issue is finalized.

• Implementextends base type for union microsoft/typespec#2737
• [JS] Redesign Extensible Enum generation #2420

/cc @joheredi for awareness