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// TYPES
type NotifyCallback = () => void
type NotifyFunction = (callback: () => void) => void
type BatchNotifyFunction = (callback: () => void) => void
type BatchCallsCallback<T extends Array<unknown>> = (...args: T) => void
type ScheduleFunction = (callback: () => void) => void
export const defaultScheduler: ScheduleFunction = (cb) => setTimeout(cb, 0)
export function createNotifyManager() {
let queue: Array<NotifyCallback> = []
let transactions = 0
let notifyFn: NotifyFunction = (callback) => {
callback()
}
let batchNotifyFn: BatchNotifyFunction = (callback: () => void) => {
callback()
}
let scheduleFn = defaultScheduler
const schedule = (callback: NotifyCallback): void => {
if (transactions) {
queue.push(callback)
} else {
scheduleFn(() => {
notifyFn(callback)
})
}
}
const flush = (): void => {
const originalQueue = queue
queue = []
if (originalQueue.length) {
scheduleFn(() => {
batchNotifyFn(() => {
originalQueue.forEach((callback) => {
notifyFn(callback)
})
})
})
}
}
return {
batch: <T>(callback: () => T): T => {
let result
transactions++
try {
result = callback()
} finally {
transactions--
if (!transactions) {
flush()
}
}
return result
},
/**
* All calls to the wrapped function will be batched.
*/
batchCalls: <T extends Array<unknown>>(
callback: BatchCallsCallback<T>,
): BatchCallsCallback<T> => {
return (...args) => {
schedule(() => {
callback(...args)
})
}
},
schedule,
/**
* Use this method to set a custom notify function.
* This can be used to for example wrap notifications with `React.act` while running tests.
*/
setNotifyFunction: (fn: NotifyFunction) => {
notifyFn = fn
},
/**
* Use this method to set a custom function to batch notifications together into a single tick.
* By default React Query will use the batch function provided by ReactDOM or React Native.
*/
setBatchNotifyFunction: (fn: BatchNotifyFunction) => {
batchNotifyFn = fn
},
setScheduler: (fn: ScheduleFunction) => {
scheduleFn = fn
},
} as const
}
// SINGLETON
export const notifyManager = createNotifyManager()
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