Type Alias FreeWheelAdUnitType

FreeWheelAdUnitType:
    | "preroll"
    | "midroll"
    | "postroll"
    | "overlay"

The possible ad unit types, represented by a value from the following list:
- 'preroll': The linear ad will play before the content started.
- 'midroll': The linear ad will play at a time offset during the content.
- 'postroll': The linear ad will play after the content ended.
- 'overlay': The non-linear ad.