Fastify route loader

loader.ts

import { FastifyInstance, RouteOptions } from "fastify";
import { join } from "path";
import { walk } from "walk";

export async function registerRoutes(server: FastifyInstance, routesDir: string = 'routes') {
  return await new Promise((resolve) => {
    const path = join(`${__dirname}/${routesDir}`);
    const files: string[] = [];
    const walker = walk(path);
    walker.on('file', (root, { name }, next) => {
      files.push(join(`${root}/${name}`));
      next();
    });
    walker.on('end', () => {
      for (const file of files) {
        const routes = require(file);
        Object.keys(routes).forEach((key) => {
          let route: RouteOptions = routes[key];
          if (!route || !route.method || !route.handler || !route.url) return;
          route = route as RouteOptions;
          let clean = file.replace(join(`${__dirname}/routes/`), '');
          clean = clean.substring(0, clean.lastIndexOf('.'));
          route.url = `/${clean}${route.url.startsWith('/') ? '' : '/'}${route.url}`;
          route.url = route.url.replace(/\\/g, '/');
          const paths = route.url.split('/');
          const cPaths: string[] = [];
          for (let path of paths) {
            if (path.startsWith('[') && path.endsWith(']')) cPaths.push(`:${path.slice(1, path.length - 1)}`);
            else cPaths.push(path);
          }
          route.url = cPaths.join('/');
          if (route.url.includes('/index/')) route.url = route.url.replace('/index/', '/');
          if (route.url.endsWith('/')) route.url = route.url.slice(0, route.url.length - 1);
          if (route.url.length < 1) route.url = '/';
          server.route(routes[key]);
        });
      }
      return resolve(true);
    });
  });
}

/**
 * Loading routes:
 * name will made up of [filePath (under routes)] + route url
 * Just export your routes from your files (const name doesn't matter) with the "RouteOptions" fastify type.
 * Ex route below !
 * PS: supports parameter routing, for /test/:param/lol write /test/[param]/lol.ts
 */

/**
 * For this route to be /home/hello, the route would need to be exported from a file named "home.[ts/js]" under the "routes" directory
 */

export const helloRoute: RouteOptions = {
  method: 'GET',
  url: '/hello',
  handler: async function (req, res) {
    const { lol } = req.query as any;
    if (lol) return res.status(400).send({ error: 'lol not allowed !'});
    return { message: "Hey there !" }
  }
}