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import { noop } from './utils'
interface AsyncThrottleOptions {
interval?: number
onError?: (error: unknown) => void
}
export function asyncThrottle<TArgs extends ReadonlyArray<unknown>>(
func: (...args: TArgs) => Promise<void>,
{ interval = 1000, onError = noop }: AsyncThrottleOptions = {},
) {
if (typeof func !== 'function') throw new Error('argument is not function.')
let nextExecutionTime = 0
let lastArgs = null
let isExecuting = false
let isScheduled = false
return async (...args: TArgs) => {
lastArgs = args
if (isScheduled) return
isScheduled = true
while (isExecuting) {
await new Promise((done) => setTimeout(done, interval))
}
while (Date.now() < nextExecutionTime) {
await new Promise((done) =>
setTimeout(done, nextExecutionTime - Date.now()),
)
}
isScheduled = false
isExecuting = true
try {
await func(...lastArgs)
} catch (error) {
try {
onError(error)
} catch {}
}
nextExecutionTime = Date.now() + interval
isExecuting = false
}
}
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