v9 type definition for the return of the interpolation/to

[brunolemos]

🐛 Bug Report

The interpolation and to methods should accept any return type, not only the same one from the interpolated value.

For example, when interpolating a height of type number, if I want to return a boolean it complains. See example below.

To Reproduce

<AnimatedView hidden={animatedStyles.height.to(value => (value > 0 ? false : true))} />

Type 'boolean' is not assignable to type 'number'.

Environment

• react-spring v9.0.0-beta.31
• react v16.8.6

[aleclarson]

Fixed in #808