@gouvfr/dsfr-nexus/src/curate/dsfr/part/image-refiner.js

Le module `dsfr-nexus` est l'interface de ligne de commande (CLI) centrale du Système de Design de l’État - DSFR. Il offre des outils pour gérer et compiler les ressources du DSFR

import { copyFile, log } from '@gouvfr/dsfr-forge';
import sharp from 'sharp';
import fs from 'fs';

const DIR_REGEX = /^(?<dir>.*[\\/])/;

const CONFIG = {
  jpeg: { quality: 80 },
  webp: { quality: 80 },
  png: { compressionLevel: 9, palette: true },
}

class ImageRefiner {
  constructor (name, state) {
    this._name = name;
    this._state = state;
    const img = fs.readFileSync(this._state.src, 'utf8');
    const stats = fs.statSync(this._state.src);
    this._size = (stats.size / 1024).toFixed(2);
    this._written = this.written.bind(this);
  }

  async write () {
    const dir = DIR_REGEX.exec(this._state.dest).groups.dir;

    if (!fs.existsSync(dir)) {
      fs.mkdirSync(dir, { recursive: true });
    }

    const image = sharp(this._state.src);
    const { format } = await image.metadata();

    switch (format) {
      case 'jpeg':
        await image.jpeg(CONFIG.jpeg).toFile(this._state.dest, this._written);
        break;
      case 'webp':
        await image.webp(CONFIG.webp).toFile(this._state.dest, this._written);
        break;
      case 'png':
        await image.png(CONFIG.png).toFile(this._state.dest, this._written);
        break;
      default:
        try {
          await copyFile(this._state.src, this._state.dest);
        } catch (error) {
          log.error(`Failed to copy file from ${this._state.src} to ${this._state.dest}:`, error);
        }
    }
  }

  written (error, info) {
    const size = (info.size / 1024).toFixed(2);
    const diff = (size - this._size).toFixed(2);
    const percent = ((size / this._size) * 100).toFixed(2);

    log.file(`${this._state.src} (-${this._size} kb) -> ${this._state.dest} (${size} kb)`, `${diff} kb (${percent}%)`);
  }
}

export { ImageRefiner };