What is the method for making Deno's standard http file_server monitor files?

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The method for making Deno's standard http fileserver monitor files is by using the watchFileSystem option. Here's an example of how to use the fileserver and watchFileSystem options together:

import { serve } from 'https://deno.land/std/http/server.ts';
import { fileServer } from 'https://deno.land/std/http/file_server.ts';

const server = serve({ port: 8000 });

// Serving files
for await (const req of server) {
  // The root directory being served
  const root = './public';

  // Enable file watching and automatic refresh
  const fileServerConfig = { 
    ...fileServer(root), 
    watchFileSystem: true 
  };

  // Serve files with the file server
  const requestHandler = fileServer(fileServerConfig);
  requestHandler(req);
}

In this example, the file_server will watch the file system for changes and automatically refresh the served files when a change is detected. The watchFileSystem option is set to true to enable this behavior.