express-fs-routers/router.js

Nextjs Like Api

const chokidar = require('chokidar');
const fsWalk = require('@nodelib/fs.walk');
const _path_ = require('path');

const withPrifix = (prefix) => {
  return new RegExp(`(^\/${prefix}$)|(^\/${prefix}\/.*$)`);
};

/** MOST DEPENDENT FUNCTION **/
const getRouteByPath = (_path) => {
  let path = _path.replace(/\\/g, '/');
  if (path.endsWith('.js')) {
    // Check For Dynamic Route  Like -> [hey]/[id].js
    const matches = path.match(/\[[a-z A-Z 0-9]*\]/g);
    matches?.map((param) => {
      path = path.replace(param, `:${param.slice(1, -1)}`);
    });

    return `/${path.slice(0, path.endsWith('index.js') ? -9 : -3)}`;
  }
};

const initial_routes = (path) => {
  const result = [];
  fsWalk.walkSync(path).map((e) => {
    if (e.dirent.isFile()) result.push(e.path);
  });
  return result;
};

const resolveModulesPath = (_path) => {
  return _path_.resolve(`./${_path.replace(/\\/g, '/')}`);
};

/* Excecution Context */
const watchFsRouter = (app, path) => {
  chokidar
    .watch(path)
    .on('add', (_path, _event) => {
      console.log(path);
      try {
        const handler = require(resolveModulesPath(_path));
        if (handler) app.all(getRouteByPath(_path), handler);
      } catch (error) {
        console.error(error);
      }
    })
    .on('change', (_path, _event) => {
      try {
        delete require.cache[require.resolve(resolveModulesPath(_path))];

        app._router.stack.forEach((route, i, routes) => {
          if (route.route?.path == getRouteByPath(_path)) {
            app._router.stack.splice(i, 1);
            // console.log('Matched Route', route.route?.path);
          }
        });

        const handler = require(resolveModulesPath(_path));
        if (handler) app.all(getRouteByPath(_path), handler);
      } catch (error) {
        console.error(error);
      }
    })
    .on('unlink', (_path, _event) => {
      app._router.stack.forEach((route, i, routes) => {
        if (route.route?.path == getRouteByPath(_path)) {
          app._router.stack.splice(i, 1);
          // console.log('Matched Route', route.route?.path);
        }
      });

      delete require.cache[require.resolve(resolveModulesPath(_path))];
    });
};

const useFsRouter = (app, path) => {
  initial_routes(path).map((r) => {
    try {
      const handler = require(resolveModulesPath(r));
      if (handler) app.all(getRouteByPath(r), handler);
    } catch (error) {
      console.log(error);
    }
  });
};

module.exports = {
  watchFsRouter,
  useFsRouter,
  getRouteByPath,
};