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@Rafe
Created January 12, 2021 13:58
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const Unitialized = -1;
const Pending = 0;
const Resolved = 1;
const Rejected = 2;
function suspenseFetch(url) {
const payload = {
_status: Unitialized,
_result: () => fetch(url)
}
return () => {
if (payload._status === Uninitialized) {
const promise = payload._result()
payload._status = Pending
payload._result = promise
promise.then((res) => {
if (payload._status === Pending) {
payload._status = Resolved
payload._result = res
}
}, (err) => {
if (payload._status === Pending) {
payload._status = Rejected
payload._result = err
}
})
} else if (payload._status === Resolved) {
return payload._result
} else {
throw payload._result
}
}
}
// in app
const fetchUser = suspenseFetch(`/users/1`)
const User = () => {
const user = fetchUser()
return <div>{user.name}</div>
}
const App = () => (
<Suspense fallback={<h1>Loading user...</h1>}>
<User>
</Suspense>
)
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