@farbenmeer/eager
v0.1.0
Published
Have you ever been annoyed by how complicated it can be to map promises to the actual values you need?
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@farbenmeer/eager
Have you ever been annoyed by how complicated it can be to map promises to the actual values you need?
const myPromise = Promise.resolve({
house: {
roof: {
shingles: 576
},
cellar: {
size: 40
},
livingRoom: {
chair: {
height: 5
},
sofa: {
width: 10
}
}
}
})
const house = myPromise.then(data => data.house)
const livingRoom = house.then(house => house.livingRoom)
const chairHeight = await livingRoom.then(livingRoom => livingRoom.chairHeight)
What if it was possible to automate this as much as possible?
Welcome to eager
const data = eager(myPromise)
const house = data.house
const livingRoom = house.livingRoom
const chairHeight = await livingRoom.chairHeight
Why is this useful?
Defining skeletons in react must currently be done at the highest level where a promise is resolved:
async function House() {
const { house } = await fetchHouseData()
return (
<>
<Roof shingles={house.roof.shingles} />
<LivingRoom>
<Chair height={house.livingRoom.chair.height} />
<Sofa width={house.livingRoom.sofa.width} />
</LivingRoom>
<Cellar size={house.cellar.size} />
</>
)
}
function HouseSkeleton() {
return (
<>
<RoofSkeleton />
<LivingRoom>
<ChairSkeleton />
<SofaSkeleton />
<CellarSkeleton />
</>
)
}
This can become tedious because the skeletons must be defined separately from the main rendering logic so a lot of structure must be duplicated and kept in sync.
Instead, with eager, it is possible to write
function House() {
const { house } = eager(fetchHouseData())
return (
<>
<Suspense fallback={<RoofSkeleton />}>
<Roof shingles={house.shingles} />
</Suspense>
<LivingRoom>
<Suspense fallback={<ChairSkeleton />}>
<Chair height={house.livingRoom.chair.height} />
</Suspense>
<Suspense fallback={<SofaSkeleton />}>
<Sofa width={house.livingRoom.sofa.width} />
</Suspense>
</LivingRoom>
<Suspense fallback={<CellarSkeleton />}>
<Cellar size={house.cellar.size} />
</Suspense>
</>
)
}
which can be simplified much by using a clever skeleton builder component.