Calculate the angle of a line defined by two points

JavaScript version
// In radians
const radiansAngle = (p1, p2) => Math.atan2(p2.y - p1.y, p2.x - p1.x);
// In degrees
const degreesAngle = (p1, p2) => (Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180) / Math.PI;
TypeScript version
interface Point {
x: number;
y: number;
}
const radiansAngle = (p1: Point, p2: Point): number => Math.atan2(p2.y - p1.y, p2.x - p1.x);
const degreesAngle = (p1: Point, p2: Point): number => (Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180) / Math.PI;