chrome-manifest-iconify/lib/icon.js

Takes a master icon and automatically generates icon set for your Chrome extension or app by parsing the v2 manifest

const { extname } = require('path');
const sharp = require('sharp');

/**
 * Class representing a Chrome extension icon
 * @memberof module:chrome-manifest-iconify
 */
class Icon {
  /**
   * Create an Icon
   * @private
   * @param {string} path - The file path to the Icon
   * @param {object} data - The Sharp image data
   */
  constructor (path, data) {
    /**
     * The file path to the Icon
     * @readonly
     * @type {string}
     */
    this.path = path;

    /**
     * The Sharp image data
     * @private
     * @readonly
     * @type {object}
     */
    this.data = data;
  }

  /**
   * A static helper function that loads an Icon from a file
   * @private
   * @async
   * @param {string|Buffer} path - Either a path or Buffer of the Icon
   * @returns {Icon} The loaded Icon
   */
  static load (path) {
    return new Icon(Buffer.isBuffer(path) ? null : path, sharp(path));
  }

  /**
   * Asynchronously creates a Buffer for the Icon
   * @type {Promise<Buffer>}
   */
  get contents () {
    return this.data.toFormat(extname(this.path).substring(1)).toBuffer();
  }

  /**
   * Writes an Icon to its path
   * @async
   * @returns {Promise} Promise that resolves when the Icon is written
   */
  write () {
    return this.data.toFile(this.path);
  }

  /**
   * Create a new Icon that is a resized version of this Icon
   * @private
   * @param {string|number} size - The size of the new Icon in pixels
   * @param {string} path - The file path to the new Icon
   * @param {string} [resizeMode] The algorithm for resizing the master Icon
   * @returns {Icon} The resized Icon
   */
  resize (size, path, resizeMode) {
    return new Icon(path, this.data.clone().resize({
      width: size,
      height: size,
      kernel: sharp.kernel[resizeMode]
    }));
  }
}

module.exports = Icon;