Interface CanvasPath

interface CanvasPath {
    arc(x, y, radius, startAngle, endAngle, counterclockwise?): void;
    arcTo(x1, y1, x2, y2, radius): void;
    bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y): void;
    closePath(): void;
    ellipse(x, y, radiusX, radiusY, rotation, startAngle, endAngle, counterclockwise?): void;
    lineTo(x, y): void;
    moveTo(x, y): void;
    quadraticCurveTo(cpx, cpy, x, y): void;
    rect(x, y, w, h): void;
    roundRect(x, y, w, h, radii?): void;
}