Developpement d'une fonction Javascript

Voila l'énoncé :

interface Point {
x: number;
y: number;
}
function getClosestPointInsidePolygon(poly: Point[], pos: Point): Point {
// This function should return the closest point to "pos" that is inside the polygon defined by "poly"
}
// Example input:
getClosestPointInsidePolygon([ { x: 0, y: 0 }, { x: 100, y: 0 }, { x: 100, y: 100 }, { x: 0, y: 100 } ], { x: 150, y: 50 })
// should return { x: 100, y: 50 }.
// This should also work with shapes more complex than a square.