Utilities for working with idle callbacks in React.
yarn add @shopify/react-idle
This library provides a hook (useIdleCallback
) and a component (OnIdle
) for registering a callback to run in the next idle callback.
Note: this callback is not called with any arguments, unlike direct usage of
requestIdleCallback
. This makes it more suited for use with discrete operations, rather than ones that will need to schedule themselves for subsequent idle callbacks if the work has not been completed.
import {useCallback} from 'react';
import {useIdleCallback, OnIdle} from '@shopify/react-idle';
function MyComponent() {
const callback = useCallback(() => {
console.log('Hello from an idle callback!');
}, []);
useIdleCallback(callback);
// or
return <OnIdle perform={callback} />;
}
If the callback ever changes, or the component unmounts, the original callback will not be run.
Because not every browser supports idle callbacks, this library allows you to specify the behavior of perform
when requestIdleCallback
is not present. There are currently two options (each of which can be passed as an unsupportedBehavior
option for the hook, or an unsupportedBehavior
prop of the component):
-
UnsupportedBehavior.AnimationFrame
(default): run the callback in the next animation frame usingrequestAnimationFrame
. -
UnsupportedBehavior.Immediate
: run the callback immediately on mount.
import {useIdleCallback, UnsupportedBehavior} from '@shopify/react-idle';
function MyComponent() {
useIdleCallback(doSomethingThatCanBeDeferred, {
unsupportedBehavior: UnsupportedBehavior.Immediate,
});
return null;
}
Because the typings for requestIdleCallback
are not yet provided by the TypeScript standard library, this module also exports a number of types that are needed to interact with these globals.