The [document](https://developers.weixin.qq.com/miniprogram/dev/api/CanvasContext.drawImage.html) said `CanvasContext.drawImage` has 3 override types. * drawImage(dx, dy) * drawImage(dx, dy, dWidth, dHeight) * drawImage(sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight) But there is only the last one: https://github.com/wechat-miniprogram/api-typings/blob/master/types/wx/lib.wx.api.d.ts#L5012-L5031