fix bug

src/tool/PluginLoader.js

@@ -1,34 +0,0 @@
-import fs from 'fs'
-import path from 'path'
-import compose from 'koa-compose'
-
-function getDirs (srcpath) {
-  return fs.readdirSync(srcpath).filter(file => {
-    return fs.statSync(path.join(srcpath, file)).isDirectory()
-  })
-}
-
-module.exports = (srcpath, filename = 'index.js') => {
-  let plugins = {}
-
-  let dirs = getDirs(srcpath)
-  let list = []
-
-  for (let name of dirs) {
-    let fn = require(path.join(srcpath, name, filename))
-
-    if (typeof fn !== 'function' && typeof fn.default === 'function') {
-      fn = fn.default
-    } else {
-      throw (new Error('plugin must be a function!'))
-    }
-
-    plugins[name] = fn
-
-    list.push(function (ctx, next) {
-      return fn(ctx, next) || next()
-    })
-  }
-
-  return compose(list)
-}