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import { readable } from 'svelte/store'
import { notifyManager, replaceEqualDeep } from '@tanstack/query-core'
import { useQueryClient } from './useQueryClient.js'
import type {
MutationCache,
MutationState,
QueryClient,
} from '@tanstack/query-core'
import type { Readable } from 'svelte/store'
import type { MutationStateOptions } from './types.js'
function getResult<TResult = MutationState>(
mutationCache: MutationCache,
options: MutationStateOptions<TResult>,
): Array<TResult> {
return mutationCache
.findAll(options.filters)
.map(
(mutation): TResult =>
(options.select ? options.select(mutation) : mutation.state) as TResult,
)
}
export function useMutationState<TResult = MutationState>(
options: MutationStateOptions<TResult> = {},
queryClient?: QueryClient,
): Readable<Array<TResult>> {
const client = useQueryClient(queryClient)
const mutationCache = client.getMutationCache()
let result = getResult(mutationCache, options)
const { subscribe } = readable(result, (set) => {
return mutationCache.subscribe(
notifyManager.batchCalls(() => {
const nextResult = replaceEqualDeep(
result,
getResult(mutationCache, options),
)
if (result !== nextResult) {
result = nextResult
set(result)
}
}),
)
})
return { subscribe }
}
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