42 lines
1 KiB
JavaScript
42 lines
1 KiB
JavaScript
// promiseInterval - replacement for setInterval for promises, starts counting
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// the interval only after a promise is done instead of immediately.
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// - promiseCall is a function that returns a promise, it's called the first
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// time after the first interval.
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// - interval is the interval delay in ms.
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const wait = (timeout) => {
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let timeoutId
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const promise = () =>
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new Promise((resolve) => {
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timeoutId = window.setTimeout(() => resolve(), timeout)
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})
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return { timeoutId, promise }
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}
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export const promiseInterval = (promiseCall, interval) => {
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let stopped = false
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let timeout = null
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const stopFetcher = () => {
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stopped = true
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window.clearTimeout(timeout)
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}
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const loop = new Promise(async (resolve, reject) => {
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try {
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while (!stopped) {
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await promiseCall()
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const { timeoutId, promise } = wait(interval)
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timeout = timeoutId
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await promise()
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}
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resolve()
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} catch (e) {
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reject(e)
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}
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})
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loop.then()
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return { stop: stopFetcher }
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}
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