Type error when inferring the type of ReadonlyArrays returned from useLoaderData

[JNaftali]

What version of Remix are you using?

1.6.5

Steps to Reproduce

I've reproduced it as a minimal fork of the stackblitz remix starter - https://stackblitz.com/edit/node-d35hmw

1. return a ReadonlyArray from a loader
2. attempt to access that array using useLoaderData<typeof loader>()
3. observe the type error when attempting to use array methods

Expected Behavior

The array should be typed correctly and methods such as array.map should be allowed. Either the array should come through typed as Array or as ReadonlyArray

Actual Behavior

the object is typed as a bare object with numeric properties and lacking all array methods.

[JNaftali]

cc @colinhacks since you might be able to quickly clarify if this is indeed a bug or just things working as intended - seems like not ideal behavior to me

[kiliman]

If you use my superjson version, it is correctly typed:

https://stackblitz.com/edit/node-cx46b4?file=app%2Froutes%2Findex.tsx

[machour]

Fixed in #3774 and released in 1.6.6