1 | import { TaskAbortError } from './exceptions'
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2 | import type { AbortSignalWithReason, TaskResult } from './types'
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3 | import { addAbortSignalListener, catchRejection } from './utils'
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4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
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11 | export const validateActive = (signal: AbortSignal): void => {
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12 | if (signal.aborted) {
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13 | throw new TaskAbortError((signal as AbortSignalWithReason<string>).reason)
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14 | }
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15 | }
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16 |
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17 |
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18 |
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19 |
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20 |
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21 |
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22 | export const promisifyAbortSignal = (
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23 | signal: AbortSignalWithReason<string>
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24 | ): Promise<never> => {
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25 | return catchRejection(
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26 | new Promise<never>((_, reject) => {
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27 | const notifyRejection = () => reject(new TaskAbortError(signal.reason))
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28 |
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29 | if (signal.aborted) {
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30 | notifyRejection()
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31 | } else {
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32 | addAbortSignalListener(signal, notifyRejection)
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33 | }
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34 | })
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35 | )
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36 | }
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37 |
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38 | /**
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39 | * Runs a task and returns promise that resolves to {@link TaskResult}.
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40 | * Second argument is an optional `cleanUp` function that always runs after task.
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41 | *
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42 | * **Note:** `runTask` runs the executor in the next microtask.
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43 | * @returns
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44 | */
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45 | export const runTask = async <T>(
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46 | task: () => Promise<T>,
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47 | cleanUp?: () => void
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48 | ): Promise<TaskResult<T>> => {
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49 | try {
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50 | await Promise.resolve()
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51 | const value = await task()
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52 | return {
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53 | status: 'ok',
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54 | value,
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55 | }
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56 | } catch (error: any) {
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57 | return {
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58 | status: error instanceof TaskAbortError ? 'cancelled' : 'rejected',
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59 | error,
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60 | }
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61 | } finally {
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62 | cleanUp?.()
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63 | }
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64 | }
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65 |
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66 |
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67 |
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68 |
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69 |
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70 |
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71 |
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72 |
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73 | export const createPause = <T>(signal: AbortSignal) => {
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74 | return (promise: Promise<T>): Promise<T> => {
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75 | return catchRejection(
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76 | Promise.race([promisifyAbortSignal(signal), promise]).then((output) => {
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77 | validateActive(signal)
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78 | return output
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79 | })
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80 | )
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81 | }
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82 | }
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83 |
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84 |
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85 |
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86 |
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87 |
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88 |
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89 |
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90 | export const createDelay = (signal: AbortSignal) => {
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91 | const pause = createPause<void>(signal)
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92 | return (timeoutMs: number): Promise<void> => {
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93 | return pause(new Promise<void>((resolve) => setTimeout(resolve, timeoutMs)))
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94 | }
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95 | }
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96 |
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\ | No newline at end of file |