A more concise way to create a continuously rounded rectangle in SwiftUI

Squircle.swift

import SwiftUI

public struct Squircle: InsettableShape {
	
	// MARK: Properties
	
	var cornerSize: CGSize
	var inset = 0.0
	
	// MARK: Initializers
	
	internal init(cornerSize: CGSize, inset: CGFloat) {
		self.cornerSize = cornerSize
		self.inset = inset
	}
	
	public init(cornerRadius: CGFloat) {
		self.cornerSize = CGSize(width: cornerRadius, height: cornerRadius)
	}
	
	public init(cornerSize: CGSize) {
		self.cornerSize = cornerSize
	}
	
	// MARK: Shape
	
	public func path(in rect: CGRect) -> Path {
		RoundedRectangle(cornerSize: cornerSize, style: .continuous)
			.path(in: rect.insetBy(dx: inset, dy: inset))
	}
	
	// MARK: InsettableShape
	
	public func inset(by amount: CGFloat) -> Squircle {
		Squircle(
			cornerSize: CGSize(
				width: cornerSize.width - amount,
				height: cornerSize.height - amount
			),
			inset: inset + amount
		)
	}
}