@docusaurus/responsive-loader/lib/adapters/sharp.js

A webpack loader for responsive images.

"use strict";

const sharp = require('sharp');

module.exports = imagePath => {
  const image = sharp(imagePath);
  return {
    metadata: () => image.metadata(),
    resize: ({
      width,
      mime,
      options
    }) => new Promise((resolve, reject) => {
      let resized = image.clone().resize(width, null);

      if (options.background) {
        resized = resized.flatten({
          background: options.background
        });
      }

      if (mime === 'image/jpeg') {
        resized = resized.jpeg({
          quality: options.quality
        });
      }

      resized.toBuffer((err, data, {
        height
      }) => {
        if (err) {
          reject(err);
        } else {
          resolve({
            data,
            width,
            height
          });
        }
      });
    })
  };
};