内容简介：Resolve or reject only last Promise.Useful if you want to "abort" already running async operations started with debounced input event.When calling the wrapper function multiple times, only the last returned
only-last-promise
Resolve or reject only last Promise.
Useful if you want to "abort" already running async operations started with debounced input event.
Install
npm install only-last-promise --save
Usage
When calling the wrapper function multiple times, only the last returned Promise
will resolve or reject and all other Promise
s will be aborted with DiscardSignal
error.
In the following example, fetch
requests for /buddy
and /allie
will be discarded (they will return undefined
), and only /becky
will be resolved with
Response
.
import onlyLastPromise, { DiscardSignal } from 'only-last-promise';
const wrapper = onlyLastPromise();
const wrappedFetch = async (url) => {
try {
return await wrapper(fetch(url));
} catch (error) {
if (!(error instanceof DiscardSignal)) {
throw error;
}
}
};
(async () => {
await Promise.all([
wrappedFetch('/buddy'),
wrappedFetch('/allie'),
wrappedFetch('/becky')
]);
// => [undefined, undefined, Response]
})();
API
onlyLastPromise()
Returns: Function
Factory function which returns wrapper function.
wrapper(promise)
Type: Function
promise
Type: Promise
Promise
to handle.
Browser support
Tested in IE9+ and all modern browsers, assuming Promise
is available.
Test
For automated tests, run npm run test:automated
(append :watch
for watcher
support).
License
MIT © Ivan Nikolić
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