8c4d6ea23b
**Why timeout 0?**
Sometimes we want to poll without timing out.
**Why an object argument?**
It's helpful to pass these extra properties by name.
`simplePoll(cb, { timeout: 0 })` is nicer than
`simplePoll(cb, undefined, 0);`
15 lines
476 B
JavaScript
15 lines
476 B
JavaScript
export default (fn, { interval = 2000, timeout = 60000 } = {}) => {
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const startTime = Date.now();
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return new Promise((resolve, reject) => {
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const stop = arg => (arg instanceof Error ? reject(arg) : resolve(arg));
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const next = () => {
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if (timeout === 0 || Date.now() - startTime < timeout) {
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setTimeout(fn.bind(null, next, stop), interval);
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} else {
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reject(new Error('SIMPLE_POLL_TIMEOUT'));
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}
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};
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fn(next, stop);
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});
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};
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