Serve static files for koa.
serve-static wrapper for koa's middleware.
$ npm install --save koa-serve-staticconstkoa=require('koa');constserveStatic=require('koa-serve-static');constapp=newKoa();app.use(serveStatic(root,options));varkoa=require('koa');varserveStatic=require('koa-serve-static');varapp=koa();app.use(serveStatic(root,options));