src/utility-types.ts

   1 import type { EventLoopUtilization } from 'node:perf_hooks'
   2 import type { KillBehavior } from './worker/worker-options'
   3 import type { IWorker, Task } from './pools/worker'
   4
   5 /**
   6  * Task error.
   7  *
   8  * @typeParam Data - Type of data sent to the worker triggering an error. This can only be structured-cloneable data.
   9  */
  10 export interface TaskError<Data = unknown> {
  11   /**
  12    * Task name triggering the error.
  13    */
  14   readonly name: string
  15   /**
  16    * Error message.
  17    */
  18   readonly message: string
  19   /**
  20    * Data triggering the error.
  21    */
  22   readonly data?: Data
  23 }
  24
  25 /**
  26  * Task performance.
  27  *
  28  * @internal
  29  */
  30 export interface TaskPerformance {
  31   /**
  32    * Task name.
  33    */
  34   readonly name: string
  35   /**
  36    * Task performance timestamp.
  37    */
  38   readonly timestamp: number
  39   /**
  40    * Task runtime.
  41    */
  42   readonly runTime?: number
  43   /**
  44    * Task event loop utilization.
  45    */
  46   readonly elu?: EventLoopUtilization
  47 }
  48
  49 /**
  50  * Performance statistics computation.
  51  *
  52  * @internal
  53  */
  54 export interface WorkerStatistics {
  55   runTime: boolean
  56   elu: boolean
  57 }
  58
  59 /**
  60  * Message object that is passed between main worker and worker.
  61  *
  62  * @typeParam Data - Type of data sent to the worker or execution response. This can only be structured-cloneable data.
  63  * @typeParam ErrorData - Type of data sent to the worker triggering an error. This can only be structured-cloneable data.
  64  * @internal
  65  */
  66 export interface MessageValue<Data = unknown, ErrorData = unknown>
  67   extends Task<Data> {
  68   /**
  69    * Kill code.
  70    */
  71   readonly kill?: KillBehavior | true
  72   /**
  73    * Task error.
  74    */
  75   readonly taskError?: TaskError<ErrorData>
  76   /**
  77    * Task performance.
  78    */
  79   readonly taskPerformance?: TaskPerformance
  80   /**
  81    * Whether the worker computes the given statistics or not.
  82    */
  83   readonly statistics?: WorkerStatistics
  84   /**
  85    * Whether the worker is ready or not.
  86    */
  87   readonly ready?: boolean
  88   /**
  89    * Whether the worker starts or stops its aliveness check.
  90    */
  91   readonly checkAlive?: boolean
  92 }
  93
  94 /**
  95  * An object holding the execution response promise resolve/reject callbacks.
  96  *
  97  * @typeParam Worker - Type of worker.
  98  * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
  99  * @internal
 100  */
 101 export interface PromiseResponseWrapper<
 102   Worker extends IWorker,
 103   Response = unknown
 104 > {
 105   /**
 106    * Resolve callback to fulfill the promise.
 107    */
 108   readonly resolve: (value: Response) => void
 109   /**
 110    * Reject callback to reject the promise.
 111    */
 112   readonly reject: (reason?: string) => void
 113   /**
 114    * The worker handling the execution.
 115    */
 116   readonly worker: Worker
 117 }