Add innerRef prop to components

[dylanmoz]

It would be nice to be able to get the underlying ref node for some of the components. For example, for this line chart I made, I needed to modify @vx/shape's LinePath to take an innerRef prop that would then assign it to the path element's ref. This way I could gain access to the svg path element, and glean some data from it (path.getTotalLength() and path.getPointAtLength()) Other libraries that I know of that do something similar are glamorous and styled-components.

Thoughts?

[hshoff]

yup will make refs opt-in

[mdugue]

since forwardRef is part of react nowadays, wouldn't it make sense to change innerRef to ref?