How to collect data from the whole project and perform hot reloads in vite plugin?

I'm currently writing a vite plugin, which aims to collect all .txt files in src/, so that each component can get access to that file list.

Currently, my code looks like:

import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
import * as path from 'node:path';
import * as fs from 'node:fs';

/** @returns {import('vite').Plugin} */
function myplugin() {
  /** @type {import('vite').UserConfig} */
  let config;

  let cache = {};
  let cached = false;

  return {
    name: 'myplugin',
    configResolved(_config) {
      config = _config;
    },
    resolveId(id) {
      if (id === 'virtual:pages') {
        return id;
      }
    },
    load(id) {
      if (id === 'virtual:pages') {
        if (!cached) {
          const dir = path.resolve(config.root, 'src');
          fs.readdir(dir, (err, files) => {
            if (err) {
              console.error(`Error reading directory ${ dir }:`, err);
              return;
            }

            console.log(files);

            files.forEach(file => {
              const filePath = path.join(dir, file);
              if (filePath.endsWith('.txt')) {
                const content = fs.readFileSync(filePath, 'utf-8');
                const key = file.replace(/\.txt$/, '');
                cache[key] = content;
              }
            });

            cached = true;
          });
        }
        return 'export default ' + JSON.stringify(cache);
      }
    },
  };
}

export default defineConfig({
  plugins: [myplugin(), sveltekit()]
});

Then I can just import pageList from 'virtual:pages' to obtain the file list.
I don't know if it is the idiomatic to implement that, and how to implement HMR for that.