Watermark based on sharp.
npm install @jswork/watermark
import watermark from '@jswork/watermark';
watermark({
src: 'https://pic.rmb.bdstatic.com/7f7a8d7b247d3aa430010f10a5765239.jpeg',
cover: './__tests__/beta_s.png', // local.png/remote.png/remote.svg
gravity: 'northwest'
}).then((res) => {
// res: buffer
});