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useUpdateImmediateEffect.js
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Mon, Feb 3, 11:30
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useUpdateImmediateEffect.js
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import
{
useRef
}
from
'react'
;
import
useStableMemo
from
'./useStableMemo'
;
import
useWillUnmount
from
'./useWillUnmount'
;
/**
* An _immediate_ effect that runs an effect callback when its dependency array
* changes. This is helpful for updates should must run during render, most
* commonly state derived from props; a more ergonomic version of https://reactjs.org/docs/hooks-faq.html#how-do-i-implement-getderivedstatefromprops
*
* ```ts
* function Example({ value }) {
* const [intermediaryValue, setValue] = useState(value);
*
* useUpdateImmediateEffect(() => {
* setValue(value)
* }, [value])
* ```
*
* @category effects
*/
function
useUpdateImmediateEffect
(
effect
,
deps
)
{
var
firstRef
=
useRef
(
true
);
var
tearDown
=
useRef
();
useWillUnmount
(
function
()
{
if
(
tearDown
.
current
)
tearDown
.
current
();
});
useStableMemo
(
function
()
{
if
(
firstRef
.
current
)
{
firstRef
.
current
=
false
;
return
;
}
if
(
tearDown
.
current
)
tearDown
.
current
();
tearDown
.
current
=
effect
();
},
deps
);
}
export
default
useUpdateImmediateEffect
;
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