@prefecthq/prefect-ui-library/src/compositions/useLastFlowRun.ts

This library is the Vue and Typescript component library for [Prefect 2](https://github.com/PrefectHQ/prefect) and [Prefect Cloud 2](https://www.prefect.io/cloud/). _The components and utilities in this project are not meant to be used independently_.

import { SubscriptionOptions } from '@prefecthq/vue-compositions'
import merge from 'lodash.merge'
import { computed, ComputedRef, MaybeRef, MaybeRefOrGetter, toValue } from 'vue'
import { useCan } from '@/compositions/useCan'
import { UseFlowRuns, useFlowRuns } from '@/compositions/useFlowRuns'
import { FlowRun, FlowRunsFilter, UnionFilter } from '@/models'

export type UseLastFlowRun = Pick<UseFlowRuns, 'subscription'> & {
  flowRun: ComputedRef<FlowRun | undefined>,
}

export function useLastFlowRun(filter: MaybeRefOrGetter<UnionFilter | null | undefined>, options?: MaybeRef<SubscriptionOptions>): UseLastFlowRun {
  const can = useCan()

  const getter = (): FlowRunsFilter | null => {
    if (!can.read.flow_run) {
      return null
    }

    const now = new Date()
    const filterValue = toValue(filter)
    const latestFilter: FlowRunsFilter = {
      flowRuns: {
        expectedStartTimeBefore: now,
      },
      sort: 'EXPECTED_START_TIME_DESC',
      limit: 1,
    }

    return merge({}, filterValue, latestFilter)
  }

  const { flowRuns, subscription } = useFlowRuns(getter, options)
  const flowRun = computed(() => flowRuns.value.at(0))

  return {
    subscription,
    flowRun,
  }
}