@phaserjs/phaser/math/mat2d/Mat2dSkew.js

Phaser 4

import { Matrix2D } from "./Matrix2D";
export function Mat2dSkew(target, angleX, angleY, out = new Matrix2D()) {
  const { a, b, c, d, tx, ty } = target;
  return out.set(a, b + Math.tan(angleX), c + Math.tan(angleY), d, tx, ty);
}