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import { derived, get, readable } from 'svelte/store'
import { MutationObserver, noop, notifyManager } from '@tanstack/query-core'
import { useQueryClient } from './useQueryClient.js'
import { isSvelteStore } from './utils.js'
import type {
CreateMutateFunction,
CreateMutationOptions,
CreateMutationResult,
StoreOrVal,
} from './types.js'
import type { DefaultError, QueryClient } from '@tanstack/query-core'
export function createMutation<
TData = unknown,
TError = DefaultError,
TVariables = void,
TContext = unknown,
>(
options: StoreOrVal<
CreateMutationOptions<TData, TError, TVariables, TContext>
>,
queryClient?: QueryClient,
): CreateMutationResult<TData, TError, TVariables, TContext> {
const client = useQueryClient(queryClient)
const optionsStore = isSvelteStore(options) ? options : readable(options)
const observer = new MutationObserver<TData, TError, TVariables, TContext>(
client,
get(optionsStore),
)
let mutate: CreateMutateFunction<TData, TError, TVariables, TContext>
optionsStore.subscribe(($options) => {
mutate = (variables, mutateOptions) => {
observer.mutate(variables, mutateOptions).catch(noop)
}
observer.setOptions($options)
})
const result = readable(observer.getCurrentResult(), (set) => {
return observer.subscribe(notifyManager.batchCalls((val) => set(val)))
})
const { subscribe } = derived(result, ($result) => ({
...$result,
mutate,
mutateAsync: $result.mutate,
}))
return { subscribe }
}
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