Function viewportToSpace

viewportToSpace(
    targetSpace?: PointSpaces,
): (
    a: Readonly<number | number[] | Geometry.Point>,
    b?: number,
) => Readonly<{ x: number; y: number }>
Returns a function that converts input viewport coordinate space to an output coordinate space.
```
// f() will convert from viewport to document coordinate space
const f = viewportToSpace('document');

// {x:100,y:100} is viewport coordinate space
f(100,100); // Yields: { x, y } converted to document space
```
Or immediately invoke for one-off use:
```
viewportToSpace('document')(100,100); // Yields: { x, y }
```
Parameters
- targetSpace: PointSpaces = ...
Returns (
a: Readonly<number | number[] | Geometry.Point>,
b?: number,
) => Readonly<{ x: number; y: number }>