Function GetInterpolationFunction

GetInterpolationFunction(interpolation: string | Function): Function
This internal function is used to return the correct interpolation function for a Tween.

It can take a variety of input, including a string, or a custom function.
Parameters
- interpolation: string | Function
  The interpolation function to find. This can be either a string, or a custom function, or null.
Returns Function
- Defined in types/phaser.d.ts:118683