Variable Boundary`Const`

Boundary: {
    Entered: BoundaryState;
    Exited: BoundaryState;
    Inside: BoundaryState;
    Outside: BoundaryState;
} = ...

Where a fix sits relative to a Geofence, including the moment it crosses.

Provided as a runtime object plus a matching string-union type so it works as both a value (Boundary.Exited) and a type annotation.

Type Declaration

ReadonlyEntered: BoundaryState

The fix just crossed from outside back inside.
ReadonlyExited: BoundaryState

The fix just crossed from inside to outside: the moment to raise a breach alert.
ReadonlyInside: BoundaryState

The fix is inside the fence and was inside before, or is the first fix inside.
ReadonlyOutside: BoundaryState

The fix is outside the fence and was outside before, or is the first fix outside.