Allow `<Link to>` to be a function

[taion]

Maybe a little QoL, thing... it'd let people do e.g.

<Link to={location => ({ ...location, query: newQuery })>

without having to worry about having location on context or wrapping the <Link>'s parent with withRouter.

[avocadowastaken]

This is really good feature! But what about push and replace?

[smashercosmo]

This is awesome

[smashercosmo]

I would like to propose also a possibility to provide a function to set isActive flag. Something like

<Link to="/hello" isActive={location => location.pathname === '/hello'} activeClassName="active">

[smashercosmo]

@jodo4x Where do you get pathname from?

[smashercosmo]

@jodo4x yes, but if your component is deeply nested you need to pass location through the components tree.

Well this issue is not suited for this discussion. I'll open a separate one.

[timdorr]

Added in #3669

[taion]

Hmm, I wonder if these functions should take e.g. { location, params } instead of just location as the arg.

[eldh]

I think { location, params } would be great.

[taion]

@eldh Thanks for your feedback! How would you use params? Would it be to essentially build a relative link?