src/routes/api/images/[id]/+server.ts

import { type RequestEvent } from '@sveltejs/kit';
import { promises } from 'fs';

/** @type {import('./$types').RequestHandler} */

export async function GET({ params } : RequestEvent) {
  try {
    const file = await promises.readFile(`${process.env.PUBLIC_FILE_UPLOAD_DIR}/${params.id}`)
    if (!file) {
      return new Response(null, { status: 404 });
    }
    return new Response(file, {
      headers: {
        'Content-Type': 'image/png',
      },
    });
  } catch (error) {
    return new Response(null, { status: 500 });
  }
}