use 0.3.0-beta.5 remix-plugin

package.json

@@ -32,8 +32,10 @@
   },
   "homepage": "https://github.com/ethereum/remixd#readme",
   "dependencies": {
-    "@remixproject/plugin": "^0.3.0-alpha.8",
-    "@remixproject/plugin-ws": "^0.3.0-alpha.4",
+    "@remixproject/plugin": "0.3.0-beta.5",
+    "@remixproject/plugin-ws": "0.3.0-beta.5",
+    "@remixproject/plugin-api": "0.3.0-beta.5",
+    "@remixproject/plugin-utils": "0.3.0-beta.5",
     "chokidar": "^2.1.8",
     "commander": "^2.20.3",
     "fs-extra": "^3.0.1",

src/websocket.ts

@@ -2,7 +2,7 @@ import * as WS from 'ws'
 import * as http from 'http'
 import { WebsocketOpt, SharedFolderClient } from '../types'
 
-const { buildWebsocketClient } = require('@remixproject/plugin-ws')
+const { createClient } = require('@remixproject/plugin-ws')
 
 export default class WebSocket {
   server: http.Server
@@ -37,7 +37,7 @@ export default class WebSocket {
       const { sharedFolder } = this
 
       this.connection = ws
-      buildWebsocketClient(ws, sharedFolder)
+      createClient(ws, sharedFolder)
       if(callback) callback(ws)
     })
   }

tsconfig.json

 {
     "compilerOptions": {
       /* Basic Options */
-      "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+      "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
       "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
       "declaration": true,                   /* Generates corresponding '.d.ts' file. */
       "outDir": "./lib",