[Feature] : Add a default value for data

[TomPradat]

As initialValue only works for server-side rendering, it could be nice to have another prop (ex: defaultDataValue) so that we can controll the initial value of data.

This would improve developer experience with the lib.

[ghengeveld]

What's stopping you from using initialValue on the client side?
Alternatively, why not use some plain JavaScript to fall back to a default value?

[TomPradat]

When using the initialValue on the client side, the promiseFn is never called.

As using plain JS, this is what I'm doing but i though it would be less painful having this shipped in the library :

const { data: { todos, userPreferences } } = useAsync({ promiseFn, defaultDataValue: { todos: [], userPreferences: null } });

vs

const { data } = useAsync({ promiseFn });

const todos = data ? data.todos : [];
const userPreferences = data ? data.userPreferences : null;

[TomPradat]

I agree this is not a mandatory feature but I though this could improve developer experience.

I'm willing to work on this if you're convinced

[ghengeveld]

How about:

const { data } = useAsync({ promiseFn });
const { todos = [], userPreferences = null } = data;

To be honest I don't think it's worth adding more API options if it can be avoided with a single line of code on the consumer side.

[TomPradat]

Yeap i undestand.

Your code doesn't work though because const { todos = [], userPreferences = null } = undefined; throws.

Thank you for your time anyway 👍

[ghengeveld]

That's easily fixed:

const { data } = useAsync({ promiseFn });
const { todos = [], userPreferences = null } = data || {};

[SachinSharmaE]

Though i really like the solution of @ghengeveld still i kind of agree with OP on this. It would be beneficial to have defaultValue